Multi-phenomena simulation of electric field assisted sintering
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Electric field assisted sintering technique (FAST) is a single step processing operation for producing bulk (near fully dense) materials from powders. The powder is placed in a conductive die and pressed with conductive punches under pressure while electric current is applied. This process differs from other powder processing techniques such as HIP and press and sinter operations where the powder or compact is heated externally in that the powder is heated directly as a result of internal Joule heating (for conductive powders) and/or by conduction from the die and punches. The overall result is much more efficient heating which allows heating rates of >1000 °C/min to be achieved . These very high heating rates can lead to non-uniform distributions of electrical current and temperature fields. In conductive powders, Joule heating may be localized, causing the evolution of temperature within the powder to be highly dependent upon local properties and variations in density. Coupled...
KeywordsThermal Diffusivity Series Arrangement High Thermal Diffusivity Lower Thermal Diffusivity Densification Kinetic
Partial financial support from grants NSF-DMI-0400168 and DAAD19-03-2-0023 (ARO/ARL) is acknowledged. BM would like to acknowledge financial support from DoEd GAANN program P200A060117.
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