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Metallurgical and Materials Transactions A

, Volume 32, Issue 10, pp 2633–2638 | Cite as

Effects of heating rate on densification and grain growth during field-assisted sintering of α-Al2O3 and MoSi2 powders

  • L. A. Stanciu
  • V. Y. Kodash
  • J. R. Groza
Article

Abstract

Two types of powders, electrically conductive MoSi2 and insulating α-Al2O3, were sintered by a field-assisted sintering technique (FAST) using heating rates from 50 °C to 700 °C/min. The Al2O3 powders were sintered to 99 pct density at 1100 °C for 2 minutes under 45 Mpa pressure. For Al2O3, no exaggerated grain growth was observed and the final grain size inversely scaled with the heating rate. Such a grain growth behavior fits the literature models based on multiple transport mechanisms for constant-heating-rate sintering. The density reached by MoSi2 under similar sintering conditions was 91 pct. The grain size was independent of the heating-rate value. Specific electrical field and pressure effects are shown to contribute to enhanced densification and minimal coarsening in each material.

Keywords

Material Transaction Conventional Sinter Fast Heating Rate Molybdenum Disilicide Constriction Resistance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2001

Authors and Affiliations

  • L. A. Stanciu
    • 1
  • V. Y. Kodash
    • 1
  • J. R. Groza
    • 1
  1. 1.the Chemical Engineering/Materials Science DepartmentUniversity of California DavisDavis

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