What is the time for spark plasma sintering?

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The mechanism of the spark plasma sintering is still unclear therefore the process name pulsed electric current sintering (PECS) should be considered as more correct.
However commercially the name SPS (spark plasma sintering) is more common.

The most accepted mechanism of the pulsed electric current sintering (PECS)is based on the micro-spark discharge in the gap between neighboring powder particles.

The spark plasma sintering process proceeds through three stages:

• Plasma heating.

The electrical discharge between powder particles results in localized and momentary heating of the particles surfaces up to several thousands ºC.
Since the micro-plasma discharges form uniformly throughout the sample volume the generated heat is also uniformly distributed.
The particles surfaces are purified and activated due to the high temperature causing vaporization of the impurities concentrated on the particle surface.
The purified surface layers of the particles melt and fuse to each other forming 'necks' between the particles.

• Joule heating.

At this stage the pulsed DC electrical current flows from particle to particle through the necks connecting them. The joule heat is generated by the electrical current. The joule heat increases the diffusion of the atoms/molecules in the necks enhancing their growth.
Localized character of heating and its uniform distribution allow rapid temperature rise and drop, which diminish coarsening (growth) of the material grains.

• Plastic deformation.

The heated material becomes softer and it exerts plastic deformation under the uniaxial force.
Plastic deformation combined with diffusion result in the densification of the powder compact to over 99% of its theoretical density.

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Spark Plasma Sintering 'SPS' (aka FAST or Field Assisted Sintering Technology) is an advanced technique to take powder and turn it into solid parts similar to additive manufacturing but without having to melt the material. It allows for the rapid application of temperature and pressure via high-density pulsed current within a controlled atmosphere. The unique heating mechanism of using electrical current gives SPS the ability to consolidate materials that traditional processes can't and at much faster rates. SPS is the ideal consolidation and bonding method for all of your materials including metals, refractory alloys, nanomaterials, ultra-high temp ceramics, and more. In simple terms, SPS can be thought of as a way of making strong and dense materials from powders using high heat and pressure.

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Overall Benefits of SPS

 

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1. Shorter Cycle Times - Sintering cycles are minutes vs hours/days for conventional processes. High productivity, extremely rapid material development capabilities.
2. Lower Sintering Temperatures - Sinter materials at lower temperatures compared to conventional sintering processes
3. Extremely Versatile - Densify low melting point metals, ultra-high temperature ceramics, or even bond dissimilar materials requiring nonuniform temperature. No other sintering process can come close. Can sinter porous parts and fully dense parts.
4. High-precision process control - Able to finely control sintering parameters including temperature and pressure to ensure the best outcome for your parts. Unique chemistries are unable to be made with conventional liquid melt processes. Engineered structures within materials preserved that would otherwise be lost in other processes

SPS & Powder Metallurgy: 

Spark plasma sintering (SPS) is a cutting-edge technique within the powder metallurgy industry, revolutionizing the fabrication of advanced materials. It involves applying high electrical current and pressure to compact powder particles, resulting in rapid consolidation and sintering. This process enables the production of high-density components with fine microstructures and enhanced mechanical properties, making it invaluable for manufacturing applications in aerospace, automotive, electronics, and healthcare sectors. By significantly reducing processing time and energy consumption while maintaining superior quality, SPS contributes to the advancement of powder metallurgy as a versatile and efficient manufacturing method, meeting the increasing demand for high-performance materials in various industries.

Just a few applications of SPS

• Energy Storage: High-capacity lithium-ion batteries and other advanced energy storage materials
• Biomedical Engineering: Porous ceramics for drug delivery and scaffolds for tissue engineering
• Advanced Ceramics: High-temperature superconductors and high-performance piezoelectric ceramics
• Intermetallics: Advanced alloys with improved mechanical, thermal, and electrical properties
• Composites: Reinforced ceramics and metals with enhanced mechanical properties

 

Diffusion Bonding using SPS

    Not only can SPS densify powder materials but it is also highly effective at bonding both similar and dissimilar materials together. Bonding can be performed with all the materials listed above and more. Options for bonding include:

 

• Bulk solid to bulk solid materials
• Powder to solid
• Bonding thin sheets together
• Functionally graded material bonding (ceramics to metals, polymers to metals, etc.)

Additional resources to learn about SPS/FAST:

Fast-SPS Booklet
https://onlinelibrary.wiley.com/doi/full/10./adem.

https://www.sciencedirect.com/topics/engineering/spark-plasma-sintering

https://www.totalmateria.com/page.aspx?ID=CheckArticle&site=kts&NM=460

 

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Classification Materials for SPS processing   Metals Virtually any metals possible: Fe, Cu, Al, Au, Ag, Ni, Cr, Mo, Sn, Ti, W, Be   Ceramics Oxides
Carbides
Nitrides
Borides
Flourides Al2O3, Mulite, ZrO2, MgO, SiO2, TiO2, HfO2
SiC, B4C, TaC, TiC, WC, ZrC, VC
Si3N4, TaN, TiN, AiN, ZrN, VN
TiB2, HfB2, LaB6, ZrB2, VB2
LiF, CaF2, MgF2 Cermets Si3N4+Ni, Al2O3+Ni, ZrO2+Ni
Al2O3+TiC, SUS+ZrO2, Al2O3+SUS
SUS+WC/Co, BN+Fe. WC+Co+Fe   Intermetalic compounds TiAl. MoSi2, Si3Zr5,NiAl
NbCo, NbAl, LaBaCuSO4, Sm2Co17   Other materials Organic materials (polyimide, etc.), compositematerials