The heat conductivity of an Si3N4-based ceramic is studied. A sintered silicon carbide, prepared from ultrafine (0.5 μm) powder Si3N4 with aluminum and yttrium oxides added to form a liquid phase and thus to activate the sintering process, is used for the study. The Si3N4-based ceramic has a heat conductivity higher than that of an oxide-based ceramic. The approximation function for heat conductivity at temperatures below 1400 K has a negative slope, that is, the effective heat conductivity tends to decrease with temperature. Above 1400 K, the effective heat conductivity tends to increase.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 9, 2004
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