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.
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Stanciu, L.A., Kodash, V.Y. & Groza, J.R. Effects of heating rate on densification and grain growth during field-assisted sintering of α-Al2O3 and MoSi2 powders. Metall Mater Trans A 32, 2633–2638 (2001). https://doi.org/10.1007/s11661-001-0053-6
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DOI: https://doi.org/10.1007/s11661-001-0053-6