| SPARK PLASMA SINTERING
(SPS)
THERMAL TECHNOLOGY introduces a revolutionary high speed
powder consolidation technology known as Spark Plasma Sintering. SPS
utilizes high amperage DC pulse current to rapidly and evenly
disperse spark plasma energy between particles. An SPS system can
process conductive, non-conductive and composite materials to any
level of density, including full density, with high homogeneity and
especially strong bonds between particles.
| SPS
TECHNOLOGY BENEFITS |
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- Equal, uniform heat
throughout the sample
- Full density and
controllable porosity
- Pre-forming and binders
NOT necessary
- Uniform sintering of
like and dissimilar materials
- Ease of use
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- Vaporization of
pre-existing contamination
- Powder-to-part net and
near-net shapes
- Minimal grain growth
- Minimal affect on
microstructure
- Low operating costs
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SPS PROCESS
The SPS plasma theory is based on the electrical spark
discharge phenomenon wherein a high energy pulse current
momentarily generates spark plasma at high localized
temperatures (up to 10,000°) between particles. The spark
energy vaporizes contaminants and oxidation on the surface
of the particles prior to neck formation. Joule heat is
concentrated on particle surfaces producing plastic
deformation which aids in high density applications. SPS is
a pressure-assisted process utilizing up to 300 tons press.
The atmosphere is vacuum with the ability to use inert gas.
Heat feedback is provided via thermocouples or pyrometer.
All Thermal Technology systems will include programmable
pressure, power settings and data acquisition.
Basic
configuration of an SPS machine
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ON-OFF
pulsed current path through machine
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cards.