YSZ被覆SiC粒子の合成と焼結性

概要

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Synthesis and sinterability of SiC-YSZ composite powders prepared by the homogeneous precipitation technique were studied. YSZ-coated SiC composite particles were obtained from the solutions consisting of [ZrO(NO3)2] = 0.092M, [Y(NO3)3] = 0.016M, [SiC] = 0.067-1.9M, [(NH2)2CO] = 3.6 - 7.2M, [H2SO4] = 0.18M. When H2SO4 concentration was higher or urea concentration was lower than these conditions, YSZ precipitate deposited separately from SiC particles. Mixture of SiC-YSZ composite powders and YSZ commercial powder containing 5-20mol%SiC was sintered at 1500-1650°C. They showed a higher sinterability than the mechanical mixture of SiC powder and YSZ powder. When SiC-YSZ composite powder (95mol%SiC) was used as the raw material, sintered bodies with 96 (SiC:20mol%) - 99% (SiC:5mol%) of theoretical density was obtained by sintering at 1550°C for 1h.
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