Although crucibles are often overlooked by many, you cannot afford to overlook their value in foundry shops and factories tasked with fabricating molten materials.
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Graphite and silicon carbide crucibles to be specific continue to steal the show when it comes to fabricating molten materials thanks to their impeccable traits. They however demonstrate certain distinct traits, which qualify their use in distinct scenarios.
Silicon carbide crucibles are bowl-like containers manufactured primarily from silicon and carbon, making them ideal for handling molten materials under unfriendly conditions.
They thrive in a number of industries thanks to their impeccable ability to withstand extreme heat and corrosive environments without breaking down.
Graphite crucibles are pot-like containers characterized by a smooth surface and a chemically inert nature, which remains stable even under extreme temperatures.
They are fundamentally utilized to melt and fabricate metals since they are less susceptible to cracking at high temperatures.
Additionally, when utilizing a graphite crucible, you can rest assured that the crucible will not react with your molten material thus eliminating the threat of contamination.
Both graphite and silicon carbide crucibles are extensively utilized in molten metal fabrication and this is a testament to their flexibility and resilience. They however exhibit a myriad of differences, which we will be delving into underneath.
Silicon carbide and graphite crucibles are made for high-heat machining operations thanks to their distinct makeup.
They, however, demonstrate varying degrees of high-temperature tolerance. Graphite crucibles reign supreme when it comes to enduring high heat, boasting of an optimal tolerance in the range of °C.
At this temperature, these specialized containers hardly experience thermal expansion, meaning they are virtually immune to cracking.
Silicon carbide crucibles, despite exhibiting high heat tolerance come second to graphite crucibles, when it comes to handling high-heat operations.
Their optimum temperature endurance is typically capped at °C to °C, which is comparatively more than what other materials can handle. They are also excellent at resisting thermal shock, making them durable and quite resistant to cracking.
Operations centered on fabricating molten materials often necessitate controlled environments to avert the risk of oxidation.
Silicon carbide crucibles thrive in settings, which expose them to bases and acids thanks to their excellent thermal stability. They demonstrate a high immunity against chemical attacks even when exposed to open air at high temperatures.
Graphite crucibles, on the other hand, are more susceptible to combustion, especially when utilized in environments exposed to open air and high heat. They however maintain their chemical stability in environments that expose them to inert gases and reducing elements.
When using graphite crucibles consider reinforcing them with protective coatings to avert oxidation.
Both silicon carbide and graphite crucibles owe their distinct strengths to their unique makeup.
Silicon carbide crucibles, particularly, have silicon and carbon to thank for their immaculate thermal conductivity and hardness.
Some are however reinforced with additives such as fillers and binders, which greatly enhance some of their traits. For instance, SiC crucibles containing silicon nitride as a bonder boast of improved strength and oxidation resistance.
Graphite crucibles, on the contrary, owe their high-temperature resistance and hardness to the highly-purified carbon accounting for the substantial concentration in their structure.
In addition to carbon, they are also comprised of binders, specifically clay, which elevates some of their attributes.
When exposed to oxygen and high heat, silicon carbide crucibles come out as the winners and this is a consequence of their relatively superior oxidation resistance.
Their chemical makeup prompts the formation of silicon dioxide, which ultimately averts oxidation even at extremely high temperatures. This encourages the utilization of silicon carbide crucibles in open-air applications.
Graphite crucibles, on the other hand, experience a deterioration in their performance levels, when deployed in open-air applications at high temperatures.
They suffer surface degradation, which ultimately leads to material loss and a weakened structure. This also means that your operation is susceptible to contamination unless you apply a protective coating or control your setting.
You can tell the mechanical strength of any crucible by analyzing its hardness, modulus of elasticity, and wear resistance among other traits. SiC crucibles are relatively stiffer and they demonstrate a higher thermal shock resistance.
This translates into lesser chances of deformation when subjected to heavy loads and a reduced risk of fracturing due to rapid temperature fluctuations.
Graphite crucibles on the contrary demonstrate higher levels of fragility making them relatively weaker than their silicon carbide counterparts. They are more susceptible to wear, especially as a result of oxidation. This, however, does not make them inferior since they still demonstrate excellent thermal stability.
Crucibles also command varying prices depending on their size, customization level, and quality.
Silicon carbide crucibles will comparatively have you digging deeper into your pockets primarily because they are made of a material that is relatively harder to come by.
However, they are guaranteed to serve you over longer periods since they are relatively more impervious to oxidation and fatigue. They command prices ranging from $20 to over $500 per piece.
Graphite crucibles generally cost between $10 and $500 per piece depending on their capacity. They command comparatively lower prices and this is a testament to the broad availability of pure graphite.
Manufacturing synthetic graphite is additionally less demanding and this contributes partially to their low price points. So, if you can limit their exposure to open air during use, these graphite crucibles can be a befitting cheaper alternative.
Certain applications including electrolysis and induction heating necessitate crucibles capable of transmitting electrical currents.
Graphite's structurepermits the maneuvering of electrons, which ultimately translates into greater electrical conductivity. They primarily boast of an electrical conductivity in the range of 700 to S/m making them perfect for electrical furnaces and induction heating.
Silicon carbide crucibles in contrast demonstrate electrical conductivity in the range of 0.1 to 10 S/m, which is significantly inferior to that of graphite crucibles.
They however boast of a myriad of other impressive attributes, which qualify their use in resistive heating applications like kilns and non-electrical melting operations.
Both graphite and silicon carbide crucibles have been a mainstay in foundry applications synonymous with expeditious temperature changes.
Graphite crucibles experience low thermal expansion and they boast of high temperature resistance and thermal conductivity. This contributes to their characteristic exceptional thermal shock endurance.
Silicon carbide crucibles, on the other hand, exhibit impressive degrees of thermal shock endurance. This degree is, however, comparatively lower than that of graphite crucibles.
Silicon carbide's ability to withstand rapid heating and cooling reflects its moderate level of thermal expansion and inherent mechanical strength. When using SiC crucibles, you should be more wary of cracking.
Porosity gives a glimpse of the contaminants or molten material that can perforate through your crucible. Graphite is comparatively more porous than SiC and this is a consequence of the layered structure exhibited by graphite.
Certain grades of graphite crucibles demonstrate porosities in the range of 15-20% raising their susceptibly to contamination and oxidation. To overcome this, simply impregnate the crucibles with appropriate coatings.
Silicon carbide crucibles in contrast have a tightly packed crystalline structure, giving them a characteristic low porosity in the range of 2-10%.
As a result, these crucibles demonstrate low gas permeability and are less prone to contamination. Their relatively low porosity level is often a consequence of their manufacturing process.
The distinct strengths and weakness of silicon carbide and graphite essentially determine their respective applications.
Graphite crucibles are renowned for their great heat resistance making them your perfect solution for metal casting and high-temperature furnaces. They are also widely favored when it comes to laboratory tests involving high heat.
Silicon carbide crucibles on the contrary demonstrate great levels of chemical inertness and oxidation resistance making them ideal for handling chemical materials. They are also quite prominent in foundry shops, where they are revered when it comes to casting aluminum, iron, and bronze among other metals.
When deciding on the best crucible for your operation, you must lean towards the crucible that guarantees you the best possible outcome.
Although both graphite and Sic crucibles reign supreme in most melting or casting processes, they fit different applications distinctively. By evaluating the underlying factors, you are guaranteed a befitting solution.
Both silicon carbide and graphite crucibles flourish in high-heat endeavors. However, they can handle varying degrees of heat meaning you must first determine your operation's operating temperature.
If it is moderately high (approximately °C to °C), Sic crucibles will do just fine. However, if the operating temperature is as high as °C, graphite crucibles would be better suited.
Evaluate the material you intend to process using the crucibles. What is its composition and is it likely to react with your crucible?
If the material is highly corrosive, you should consider silicon carbide crucibles since they are more resistant to chemical attacks and can endure highly oxidizing environments. However, if your molten material is mildly reactive or non-reactive, graphite crucibles will work perfectly.
After determining the nature of your molten material, proceed to evaluate how likely it is to react with your crucible. Graphite crucibles for instance are more prone to chemical attacks from highly corrosive chemicals, putting them at risk of premature damage.
Durability is a factor you cannot afford to overlook since it determines whether you get optimal returns on your crucible.
Silicon carbide crucibles typically demonstrate longer lifespans making them your perfect solution for frequent melting or casting. Graphite crucibles on the contrary exhibit longer lifespans when utilized in high-temperature operations under low oxidizing conditions.
Silicon carbide as a material, differs from other materials used to construct crucibles. Its unique makeup permits its use in considerably unfriendly conditions. Using SiC crucibles promises the following rewards in a nutshell:
Graphite's myriad of impressive attributes have propelled its decades-long utilization in the production of high-quality crucibles. It remains one of the most favored crucible-manufacturing materials thanks to its;
Despite both graphite and SiC crucibles being extremely durable, SiC crucibles often tend to outlast their graphite counterparts. They are less prone to oxidation, which often eats away material from graphite crucibles resulting in a weakened structure.
High-temperature casting/melting is the backbone of most laboratory experiments and foundry shops. It demands specialized equipment, specifically crucibles, which must exhibit exceptional thermal and chemical stability.
Graphite and silicon carbide are two distinct materials boasting of these traits hence they are often preferred when it comes to high-temperature melting.
Silicon carbide crucibles are generally made of carbon bonded silicon and graphite materials. Silicon carbide crucibles are suitable for smelting and melting precious metals, base metals and other metals in an induction furnace. They are used at a temperature reaching degree celsius.
The silicon carbide crucible offers a uniform and consistent temperature when melting and has a high strength and resistance to cracking. The uniform temperature gives a high quality molten metal needed for casting long lasting and good quality metal products.
Silicon carbide crucibles have good thermal conductivity, high strength, low thermal expansion, oxidation resistance, resistance to thermal shocks, resistance to wetting, high hardness and wear resistance.
Due to the silicon carbide crucible properties, it is applicable in various industries such as, chemical, electron, semiconductor, metallurgy, etc.
Reddit LinkedIn Parameters Model A ± 5mm B ± 5mm C ± 10mm H ± 10mm SiC26 170 130 115 220 SiC28 170 130 115 260 SiC30 205 162 130 265 SiC40 240 200 170 335 SiC60 270 210 180 335 SiC80 290 230 225 340 SiC85 295 240 225 400 SiC90 305 248 150 345 SiC95 310 255 170 345 SiC100 310 240 220 350 SiC110 325 266 205 380 SiC153 375 310 200 400 SiC154 395 325 220 580 SiC155 390 330 220 650 SiC170 355 295 280 480 SiC200 400 349 215 510 SiC201B 420 360 215 505 SiC202 425 350 230 530 SiC203 430 355 230 600 SiC204(thin) 420 360 210 500 SiC205 430 360 230 650 SiC292 510 444 290 450 SiC293 500 444 290 510 SiC300 450 390 250 500 Features & BenefitsΔ
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A silicon carbide graphite crucible is a container made up of silicon carbide and graphite materials, utilizing tar pitch or other synthetic resins as bonding materials. Silicon carbide graphite crucibles are used to hold metal for melting in a furnace. These materials can withstand high temperatures in a typical foundry process. The silicon carbide graphite crucible is able to withstand extreme temperatures (up to degree celsius) encountered in melting metals.
Due to their unique and qualitative manufacturing processes and quality raw materials, silicon carbide graphite crucibles are highly refractory products used for melting ferrous and non ferrous metals and alloys in the foundries due to their unique properties when compared to metal crucibles; such as good thermal conductivity, low thermal expansion, resistance to thermal shock, resistance to wetting molten metals, etc. These crucibles are mostly used for melting non ferrous precious metals such as brass, copper, nickel, chromium, zinc, aluminium, bronze, etc.
In view of the fast development in the industrial activity in the fields of foundry and engineering, the demand of the silicon carbide crucibles is ever increasing particularly from mines, railways, aeronautics, defense production units and other precious metals and alloy manufacturing units in the country which in turn are creating a wider scope for setting up new units.
The silicon carbide crucible is widely used in metallurgy, automotive, petroleum, semiconductors, iron, steel, electronics industry, machinery industry, chemical industry, powder metallurgy, aerospace, scientific experiments, etc.
These industries make use of the silicon carbide graphite crucibles due to their outstanding qualities as well as ease of use. Silicon carbide crucibles are simply used in induction furnaces, electric furnaces, as well as fuel fired furnaces. The SiC crucibles need to be tempered or preheated at 200 degree celsius for two hours before they are charged with metals. The SiC crucible is also widely adopted by these industries because it saves both cost of energy and production time.
Silicon carbide and graphite are the two main raw materials used in the production of silicon carbide graphite crucibles. These two materials have their own unique properties that make them the materials of choice for high quality crucible production.
Silicon carbide is an important non oxide ceramic which has diverse industrial applications. In fact, it has exclusive properties such as high hardness and strength, chemical and thermal stability, high melting point, oxidation resistance, high erosion resistance, etc. All these qualities make SiC a perfect raw material for high power and metal melting applications.
Graphite material on the other hand is a distinct material as it displays the properties of both metals and nonmetals. Graphite is flexible and has high electrical and thermal conductivity. It is also chemically inert and highly refractory. Graphite has a high melting point and a good conductor of heat.
The features and advantages of the silicon carbide graphite crucible include the following:
In order to get the best performance out of your SiC graphite crucible, there are certain practices that should be followed judiciously, therefore, the SiC crucible will have a long service life.
There are different furnaces, so also there are different crucibles that match every furnace distinctively. When you know the type of your furnace, this will guide you in choosing the best crucible that matches your furnace. Likewise, the dimension of the space of the furnace will dictate the choice of crucible.
These crucibles can be charged while outside or when installed inside the furnace, but they are removed from the furnace when extracting molten metal. The shape of the silicon carbide graphite crucible allows them to be lifted with tongs designed to properly support the crucible.
When smelting large quantities of non ferrous metals and alloys, the silicon carbide graphite crucible is the ideal choice, as you can smelt up to 30kg of metal at once. The price of silicon carbide graphite crucible is more affordable compared with other types of crucibles. Apart from the large SiC graphite crucible sizes, there are also sizes below the 30kg metal holding capacity.
However, when smelting pure gold of 1 to 30 kg sizes, a silicon carbide graphite crucible or a graphite crucible is the best choice, this ensures that your gold remains pure even after melting.
The different types of furnaces are; fuel fired furnace, electric resistance furnace and induction furnace. All these types of furnaces are designed to use removable silicon carbide graphite crucibles.
Propane torch or fuel fired furnaces: The fuel fired furnaces are powered by coke, gas, oil or propane. This type of melting furnace is not entirely safe for the environment because of the emissions that would occur when it is fired.
When using a fuel fired furnace, it is best to use a crucible that is able to withstand the effects of the burner flame at the base of the crucible and the crucible must be tapered to allow the flame to circulate around the crucible from bottom to top, this allows the crucible to heat up evenly.
The crucible material must also be able to resist oxidation damage from frequent exposure to flame and accommodate the rate of thermal change the crucible will experience. Good thermal conductivity are important crucible properties in transferring the heat from the interior of the furnace through the crucible to the metal charge.
Crucibles with high graphite content such as the silicon carbide graphite crucible offer high thermal conductivity in gas fired furnaces.
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Electric resistance furnace: The electric resistance furnace works in such a way that heat is generated by conductors that offer resistance to the passage of a current through them. Resistance furnaces are widely used in heat treatment for heating prior to shaping and to dry or melt metals.
Electric resistance furnaces provide even and all round heating to a crucible; and they are ideally suited to precise temperature control in metal melting. An energy efficient crucible with high graphite content is best for the electric resistance furnace because it has a high thermal conductivity for faster melting. The silicon carbide graphite crucible fits into this description and it is best used for the electric resistance furnace.
Induction furnace: Crucibles for induction furnaces require a more careful consideration when compared to other types of furnace. The reason is because there are induction furnaces whose crucibles are designed to be heated in the furnace's inductive field and are used to melt the charge. In other induction furnaces, crucibles that allow the inductive field to pass through them and heat the metal charge directly are used.
Therefore, it is important to match the electrical characteristics of the crucible to the operating frequency of the furnace and the melting application; this however prevents crucible overheating.
The silicon carbide graphite crucible is applicable for melting in an induction melting furnace, any other crucible without a great percentage of graphite material cannot be induced to generate heat in the induction furnace.
Knowing what type of metals or alloys you melt or hold will influence the choice of crucible. The silicon carbide graphite crucible is mostly used to melt metals such as brass, copper, nickel, chromium and their alloys, etc. The first thing to always have in mind when selecting a crucible is that the crucible must have a higher melting temperature than the metals you wish to melt. Silicon carbide graphite crucible can be used at degree celsius. Silicon carbide crucibles can also be used to melt and hold aluminium and aluminium alloys, aluminium-bronze, copper and copper based alloys, nickel-bronze alloys, precious metals, zinc and zinc oxide. The silicon carbide graphite crucible performs higher in melting these metals because it has a higher shock resistance and higher density that prevents erosion.
To help guide further about choosing the right crucible for your application, consider answering the questions below:
What is the capacity of my melting?
What type of metals are my melting?
What type of furnace am I using?
What are the melting temperatures of the metals I want to melt?
Am I ready to keep changing crucibles every now and then or I want a long lasting crucible?
How much do I have to spend on a crucible?
Even though you are not sure of the crucible to choose despite having the knowledge of furnace capacity and dimension, you do not have to worry, our service team is always available to guide you in making a choice of crucible that best matches your furnace.
We are not only interested in guiding you through how to purchase the most suitable crucible that meets your needs, we are also interested in how you are able to maintain your crucible products. After purchasing your silicon carbide graphite crucible, it is also required that you take proper care of them to ensure that they last a very long time even after repeated use. The following practices will ensure you have a long lasting silicon carbide graphite crucibles:
3. Caused by heating the crucible too fast, especially when the button heat is faster than the heat reaching the top.
Wedging at the top of the crucible is also likely to cause this problem.
Improper crucible tongs or knocking on the upper edge will also cause hard damage and damage to the edge of the crucible neck.
4. Longitudinal crack on the surface of the crucible (in this case, the crack does not extend to the bottom of the crucible.4. This problem is caused by internal pressure. For instance, if the cooled wedge shape casting material is put into crucible horizontally, the wedge-shaped casting material will get damaged when heated.B. TRANSVERSE CRACK1. Appears near the bottom of the crucible and may cause the bottom of the crucible to fall off.1. It may be caused by indiscriminately throwing ingots into the crucible or hitting the bottom of the crucibles with hard objects such as iron rods.
Thermal expansion can also lead to transverse crack.
2. In the middle position.2. It could also be caused by placing the crucible on an unsuitable crucible base.
If the crucible tongs and force is too high when removing the crucible, it will lead to a crack on the surface of the crucible.
3. When using a SA series crucible, there is a transverse crack at the bottom of the crucible mouth.3. Caused by not installing the crucible properly.
If the refractory soil is tightly squeezed under the crucible mouth when installing the crucible; when the crucible cools and shrinks during use, the stress points will be solely on the crucible mouth, which then leads to cracks.
C. STAR CRACK1. Appears at the bottom of the crucible.1. Caused by thermal expansion.2. Appears on the side of the crucible.2. Usually caused by the expansion of the wedge after heating.D. HOLE/BREAK1. Large holes appear on the wall that are not thinned out through very long use.1. Mostly caused by throwing in ingots into crucibles indiscriminately.2. Small holes2. Usually caused by cracks.E. CORROSION1. Corrosion of the metal liquid level inside the crucible.1. It is caused by additives and metal oxide floating on the metal surface.
Avoid excessive use of additives.
2. Corrosion appears in many places inside the crucible.2. Usually caused by corrosive substances such as additives not properly added to molten metal. Additives should be used according to stated regulations.3. Corrosion appears on the bottom or bottom edge of the crucible.3. Caused by the use of low quality slag or excessive heating temperature.4. The depression on the surface of the crucible.4. The additives infiltrate and erode the crucible outer wall through the inner wall of the crucible.F. COMPREHENSIVE PROBLEMS1. Mesh cracks on the outside1. Net-like cracks like crocodile skin, these are already too old and reached the end of its service life.2. Melting speed becomes slower than usual.2. This happens because the crucible is too old and has reached the end of its service life.3. The glaze comes off.3. This is caused by heating a cool crucible directly in a hot furnace.
It may also be caused by heating the crucible too fast.
4. The bottom protrudes upwards and then cracks.4. This could occur as a result of coke or slag sticking to the base of the crucible.
Also, if the crucible is placed directly on hard ground, the crucible protrudes upwards and then cracks.
5. Crack at the bottom of the crucible.5. Caused by slag expansion at the bottom of the crucible.6. The surface of the crucible appears greenish and begins to get soft.6. This is caused by long time melting above degree celsius.7. The bottom or bottom edge of a new crucible becomes detached.7. This is caused by not preheating a new crucible.8. Crucible deformation.8. Different parts of the crucible become expanded unevenly as a result of uneven heating.
Heat up the crucible rapidly and evenly.
9. Oxidation.9. The crucible is oxidized in an oxidizing atmosphere between 600 and 900 degree celsius.10. The crucible wall becomes thinner.10. When the crucible has used its stipulated service life, stop using it. Chapter 3:Superbmelt is indeed the production company that produces silicon carbide graphite crucibles and distributes to other wholesalers, retailers and many other end users. We determine the raw materials used for making the crucibles, we also design the silicon carbide graphite crucible sizes and shapes.
With the best raw materials, machinery and professionals, we ensure our crucible products meet the standard, this has enabled our clients over the years to trust us with only the best crucible products. Therefore, we cannot let them down.
Superbmelt has a wide sales network that connects refiners, laboratories, foundries and other industries that require metal melting and smelting for their production across 30 countries of the world.
The raw materials silicon carbide and graphite are graded to the required sizes and mixed with bounding materials like molten pitch or other suitable synthetic resins in suitable proportions. The kneaded homogeneous mixture is charged under a specified technical process. While this operation is going on, the total mass of mixture in the mold is kept in uniform hot condition to avoid manufacturing defects while pressing.
Typically, silicon carbide is produced using the Acheson process which involves heating silica sand and carbon to high temperatures in an Acheson graphite resistance furnace. It can be formed as a fine powder or a bonded mass that must be crushed and milled before it can be used as a powder feedstock. Once the Silicon Carbide is in a powder form, the grains of the compound are bonded together by sintering to form a very useful engineering ceramic, which has a wide range of uses including foundry use.
The second main raw material which is graphite is mined both on surface quarry and underground. The surface quarry involves mining graphite from an open pit or burrow. Underground mining is usually carried out when the graphite is present at a greater depth.
All these processes have to be passed through to get natural and high quality raw materials.
The raw materials, silicon carbide and graphite with additives such as ferro silicon- ferro manganese, etc, are graded to the required sizes and mixed with bonding materials like molten pitch or other suitable synthetic resins in suitable proportions. The mixing is done in a kneading mill, namely through a U-mixer when the bonding materials are in molten condition. The kneaded homogenous mixture is charged into an ejection type crucible die fitted on hydraulically operated roller presses. While pressing operation is ongoing, the total mass of mixture in the mold is kept in uniform hot condition to avoid manufacturing defects while pressing.
The shaped articles are left for a few days for setting and cooling. The ware is inspected for laminations, cracks, etc. and then loaded into shuttle kilns for firing at to degree celsius under reducing atmosphere to avoid oxidation of graphite and carbon.
To create a reducing atmosphere, the products are loaded into fire boxes called 'saggers' tightly packed with reducing agents like coke/coal dust, sometimes even graphite powder. The fired ware is unloaded from the kiln after cooling. These are inspected and cooled with a suitable glaze, which has inherent properties of protecting the crucible from oxidation at operating temperature.
Graphite material is easy to machine to ensure smoothness of crucible products.
Superbmelt creates this high degree of precision using computer numerical control (CNC), replacing manually operated machines, vertical millers, and lathes with a centralized automated system. CNC machines convert computer-aided design (CAD) models into mass-produced parts with as little as . variation between parts.
The CNC precision machines operate via advanced manufacturing technology, removing material from a solid block using a variety of cutting tools to achieve the intended design. There are three basic processes of CNC machining:
Milling: This process mounts the part onto a bed and removes material using rotational cutting tools, creating products in a wide variety of shapes.
Turning: This process mounts the part on a rotating chuck and removes material using stationary cutting tools, creating axially symmetric end products.
Electrical Discharge Machining (EDM): This process uses controlled electrical discharge to obtain desired shape.
The choice of graphite and silicon carbide materials enables the CNC machine to provide even and smooth SiC graphite crucibles. A crucible that is not even or smooth will definitely affect the quality of melting and possibly cause contamination of metal.
Superbmelt silicon carbide crucibles go through the process of testing after the CNC machining process. The phase of testing helps us to ascertain the quality, efficiency and durability of our silicon graphite crucibles, therefore, our customers do not have to worry about defects that may have been skipped during the production process. At this stage, we identify only the standard silicon graphite crucibles that will make it to customer shelves.
We carry out three different types of test, which include: quality test, durability test and temperature test.
Quality test: Silicon carbide graphite crucibles are made up of silicon carbide and graphite. At this stage, these crucibles are tested for impurities and graphite grade, this ensures that no impurities or contamination from raw material occurs during the melting process. The quality of the crucible mainly depends on the number of heats/melts it can withstand in the foundry operations.
Durability test: This test focuses on how long our silicon carbide graphite crucible can last. At this point we determine the maximum melting point of the silicon graphite crucibles. This test is also carried out after the CNC machining process.
Temperature test: This test ensures that our silicon carbide graphite crucibles are able to withstand rapid heating and cooling temperatures of melting and casting.
The world is moving really fast and every customer is looking at shopping with retail stores or companies that offer very fast shopping and delivery experience. At Superbmelt, we ensure you not only enjoy guided and fast shopping experience but you also get your items sent to you within three working days no matter where you are in the world, we deliver right at your doorstep.
We are able to ensure that our clients get their ordered products really fast due to the amount of crucibles we produce on a daily basis.
At Superbmelt, we ensure that we have all national government and international approval of our products, hence, we produce only high quality silicon carbide graphite crucible products. International approval makes us extend our market outside our immediate environment.
Superbmelt is an ISO CE SGS approved company. These certifications of approval is an indication that Superbmelt products are of high standard.
We have professionals and customer relations officers that are available round the clock to guide, assist and attend to clients needs. Customer needs are very paramount to us, this is why we ensure that our customers needs are met when they come to us.
Our support service provides the following functions; attend to customer enquiries, attend to customer purchases, offer advice and guidance, track shipping of product till they are received, etc.
Chapter 4:Silicon carbide crucibles have come to become an essential tool in metallurgy. Almost every industry that requires melting opt for the SiC crucible due to the ease of use and affordability to their production.
There are numerous SiC crucible manufacturers which may make you wonder where to choose from. At Superbmelt, we are not only concerned with you using your SiC crucibles just once or twice, but we ensure that you use your crucibles for as long as possible. We are able to achieve this, first from selecting high quality raw materials that make up the SiC graphite crucible; we also ensure that you purchase the crucible that is best suitable for your application.
The features you benefit from Superbmelt SiC graphite crucibles include: good thermal conductivity, low thermal expansion, resistance to thermal shock, resistance to wetting, resistance to fluxes, etc. Supermelt silicon carbide graphite crucible price is quite affordable for larger and small businesses.
Chapter 5:Crucibles are containers that are used to melt metals, any material that must be used as a crucible must have a higher temperature than the melting metal. Metal, graphite, silicon graphite and quartz based containers can be used as crucibles.
The difference between the two crucibles are: The material composition of the crucibles, graphite crucibles are mostly made of graphite material while silicon carbide crucible is made with a combination of silicon carbide and graphite. Graphite crucibles are designed to melt metals such as gold, silver, copper and aluminum. Silicon carbide crucibles are used for smelting in larger induction furnaces, they are durable, do not oxidize or break down.
Yes, a silicon carbide crucible is usable in an induction furnace. The silicon carbide crucible is able to melt at degree celsius in an induction furnace.
Silicon carbide crucibles are used for melting and smelting precious metal, base metals and their alloys.
The different types of crucibles are graphite crucibles, clay graphite crucibles, crucibles for melting gold, crucibles for melting silver, silicon carbide crucibles, quartz crucible, etc.
Silicon carbide crucibles are very affordable, in fact, you can purchase as many as possible depending on your production capacity.
Yes, Superbmelt manufactures high quality silicon carbide crucibles with original material, especially designed equipment and technicians that are experts in the science of crucible.
Silicon carbide has certain properties among which is a good conductor of electricity. Other properties of silicon carbide are; high hardness, chemical inertness, high thermal conductivity, low coefficient of thermal expansion, thermal shock resistance, strength at high temperature ranges, etc.
Yes, brass can be melted in a silicon carbide crucible since the melting temperature of brass is between 900 to 940 degree celsius.
Step 1: Gently scrape as much residue left from the materials used in your experiment from the crucible. Step 2: Fill your SiC crucible with fused potassium bicarbonate (solid form). You should have enough bicarbonate in the crucible to fill past the line of the remaining material from your experiments. If you need to fill the entire crucible, do so. Step 3: Place the crucible on a burner. Heat the crucible until the fused bicarbonate melts. Heat it until a layer of red potassium salt appears on the surface. Using a mixing rod, stir the melt a few times. The entire melting procedure should take about one minute. Step 4: Remove your crucible from the flame. Pour out the melt. Step 5: Rinse the crucible in hot water. Use a clean cloth to dry the surface.
After installation in a furnace, the crucible should be heated slowly to a temperature reaching 200 degree celsius over a period of two hours, this is to eliminate any moisture that may be present in the crucible. Afterwards, silicon carbide crucible should be heated up at a temperature of 950 degree celsius on full power. Silicon carbide crucibles used in melting operation can be continuously heated up on full power until working temperature is reached. The crucible is ready to be charged with care. The above recommendation is for the use of new crucibles in existing furnaces. When installing a new silicon carbide crucible into a new furnace, the heating and drying instructions of the furnace manufacturer should be followed. If the furnace manufacturer prescribes a longer heating cycle, this procedure should be carried out without the crucible installed. It is essential that the crucible is installed in an absolutely dry furnace.
Gold with 99.9% purity, that is, 24 karat will not lose its purity during melting because it does not oxidize or vaporize. Although during pouring, some may be lost by spilling and some may remain in the crucible, they can be recaptured and remelted.
Yes, you should temper the silicon carbide graphite crucible before you begin melting. The purpose of tempering your silicon carbide graphite crucible is to get rid of moisture in the crucible and prevent crucible shock.
Crucible for silver is used to melt silver, gold aluminum, zin and other alloys. Crucible for silver is composed of graphite and it is able to withstand a temperature of about degree celsius.
The different types of crucibles, they are silicon carbide graphite, graphite crucibles, clay graphite crucibles; they are made of either graphite or a combination of other materials such as silicon carbide or clay and graphite.
An induction furnace consists of a nonconductive crucible that is holding the charge of metal to be melted, the crucible is surrounded by a coil made of copper wire. A powerful alternating current flows through the wire. The coil creates a rapidly reversing magnetic field that penetrates the metal. The magnetic field induces eddy currents inside the metal by electromagnetic induction.
A silica crucible is a transparent container that is resistant to extremely high temperatures as well as being chemically inert to get non contaminable results.
The best material for crucible is graphite. Any other material that combines graphite is also good for making crucibles.
The purpose of heating the crucible before melting is to get rid of moisture that may be present in the crucible and for reducing thermal stress. This practice helps preserve the crucible life.
SiC graphite crucible should be tempered before use. Heat the empty crucible at a low temperature for about 20 minutes. Then work the furnace crucible till red hot. Turn off the heat and leave the crucible to cool slowly. This process takes off any moisture in the crucible. SiC graphite crucibles should be properly checked for cracks prior to each application.
A silicon carbide graphite crucible is primarily composed of silicon carbide and graphite materials.
Preheating a crucible before use is important for reducing thermal stress on the crucible. This is extremely important when using a crucible for the first time, as it will keep the crucible from cracking. A preheated crucible also helps with adequate measurements.
Graphite is often used as a material or part of the material for making crucibles dues to its properties. Graphite is soft, cleaves with very light pressure and has a very low specific gravity. Graphite is extremely resistant to heat and nearly inert contact with almost any other material.
Crucibles must be allowed to cool before weighing because the heat from the crucible warms the surrounding air which rises, then the air cools down and falls. The rise and fall of surrounding air is called a convection current that gives unsteady reading that is rising and falling. Other reasons for allowing crucibles to cool before weighing is that a crucible is hot enough to transfer heat to the weighing balance, potentially damaging it but at least affecting measurement due to expansion of the balance components.
At Superbmelt, we are SiC crucible manufacturers, we manufacture silicon carbide graphite crucibles, graphite crucibles among other crucible types, from high quality raw materials.
Crucible life depends on a number of variables including furnace type, metal melted, flux usage, operator practices, etc. This is why we encourage optimum care of crucibles so that they last a very long time.
Use only a limited amount of flux at the specified temperatures for a limited time. First, make sure your metal is completely melted. Next, add flux and mix thoroughly with metal. Make sure to clean all the ash and oxides from the crucible during the melt and after it has been emptied.
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