窒化ケイ素セラミックスの焼結と機械的特性に及ぼすMgAl_2O_4-ZrO_2添加の影響

概要

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The influences of the sintering additive content of MgAl_2O_4-ZrO_2(total 5-15 mass% with a MgAl_2O_4/ZrO_2 ratio 1:1)on sintering behaviors, microstructure and mechanical properties of Si_3N_4 ceramics were investigated. Sintering was carried out in the temperature range of 1200 to 1900℃. Densification was enhanced with increasing sintering additive content due to an improved particle rearrangement;however, phase transformation and grain growth were significantly suppressed. The phase transformation and grain growth occurred through a solution-reprecipitation mechanism controlled by a diffusion process in this additive system. With the addition of a small amount of the above-mentioned additive mixture(5 mass%), both high flexural strength and high fracture toughness could be obtained.
社団法人日本セラミックス協会の論文
2000-08-01