Effects of MgAl2O4-ZrO2 Addition on Sintering Behaviors and Mechanical Properties of Silicon Nitride Ceramics.

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  • 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<sub>2</sub>O<sub>4</sub>-ZrO<sub>2</sub>添加の影響

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Abstract

The influences of the sintering additive content of MgAl2O4-ZrO2 (total 5-15mass% with a MgAl2O4/ZrO2 ratio 1:1) on sintering behaviors, microstructure and mechanical properties of Si3N4 ceramics were investigated. Sintering was carried out in the temperature range of 1200 to 1900°C. 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 (5mass%), both high flexural strength and high fracture toughness could be obtained.

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