Al_2O_3-Sic複合材料の微細構造と機械的性質(<特集>セラミックスの微細構造)

概要

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The effects of SiC dispersions with average particle sizes of 2 and 8μm on the microstructure and mechanical properties were investigated for Al2O3-SiC composites, which were fabricated at 1500° to 1800°C for 1h under the applied pressure 27MN/m2. The sintering temperature increased with increasing the SiC content. However, the grain growth of Al2O3 was remarkably inhibited by incorporating SiC particles, especially those of 2μm. The Vickers hardness of composites increased with increasing the SiC content. The maximum toughness and strength, 4.5MN/m3/2 and 490MN/m2, were observed for the composite containing 10mol% 2μm SiC prepared at 1600°C, approximately 40% higher than those with Al2O3 only. The increases may be attributed to the increase in toughness by crack deflection and/or microcracking caused by the SiC dispersions.
社団法人日本セラミックス協会の論文
1986-08-01