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Erschienen in: Journal of Materials Science 14/2008

01.07.2008 | Letter

Multi-phenomena simulation of electric field assisted sintering

verfasst von: Brandon McWilliams, Antonios Zavaliangos

Erschienen in: Journal of Materials Science | Ausgabe 14/2008

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Excerpt

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 [1]. 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 with the fact that the powder is not pressed prior to sintering, a situation arises where the sample will be nearly insulating at the beginning of the process and transition to conductive upon densification [2]. This dramatic variation in properties can have a profound effect on the local temperature history and resulting final properties/performance of the part [3]. …

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Literatur
2.
Zurück zum Zitat Zhang J (2004) Numerical simulation of transient thermoelectric phenomena in field activated sintering. Drexel University, Philadelphia, PA Zhang J (2004) Numerical simulation of transient thermoelectric phenomena in field activated sintering. Drexel University, Philadelphia, PA
4.
Zurück zum Zitat Zavaliangos A et al (2004) Temperature evolution during field activated sintering. Mater Sci Eng A 379 Zavaliangos A et al (2004) Temperature evolution during field activated sintering. Mater Sci Eng A 379
5.
Zurück zum Zitat McWilliams B, Zavaliangos A (2004) Towards the design and optimization of sintering aided by electric current for high melting point materials. In: International conference on powder metallurgy and particulate materials, Chicago, IL McWilliams B, Zavaliangos A (2004) Towards the design and optimization of sintering aided by electric current for high melting point materials. In: International conference on powder metallurgy and particulate materials, Chicago, IL
8.
Zurück zum Zitat McWilliams B, Zavaliangos A (2007) Multi-phenomena simulation of electric field assisted sintering. In: International conference on powder metallurgy & particulate materials, Denver, CO McWilliams B, Zavaliangos A (2007) Multi-phenomena simulation of electric field assisted sintering. In: International conference on powder metallurgy & particulate materials, Denver, CO
11.
Zurück zum Zitat Raichenko AI (1987) Fundamental processes in powder sintering. Metalurgiya, Moscow Raichenko AI (1987) Fundamental processes in powder sintering. Metalurgiya, Moscow
Metadaten
Titel
Multi-phenomena simulation of electric field assisted sintering
verfasst von
Brandon McWilliams
Antonios Zavaliangos
Publikationsdatum
01.07.2008
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 14/2008
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-008-2744-5

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