Preparation and Thermal Shock Property of Si3N4 Ceramic Reinforced by Orientation SiC Whiskers

Abstract

Abstract: A highly orientation SiC whisker reinforced Si₃N₄ composite was fabricated by fiber extrusion and hot-pressing technique, which SiC whiskers were unidirectional oriented in the extruded carrier
fiber. Microstructure of the composites was observed by SEM. Whisker directions were image-processed to quantify SiC whisker orientation in the extruded fibers and the composites. Effects of sintering temperature
and SiC whisker content on the flexural strength and fracture toughness of the composites were investigated. The experimental results show that the flexural strength and fracture toughness of the orientation SiC whisker
toughened Si₃N₄ composites are higher than that of the random SiC whisker toughened Si₃N₄ composites after thermal shock experiment, in temperature difference of 1000℃ and 500℃.

Key words: Si₃N₄, SiC whiskers, microstructure, thermal shock property

CLC Number:

TB321
TQ343

LUO Xue-Tao,CHEN Xian-Jun,HUANG Qian-Jun,CHEN Li-Fu. Preparation and Thermal Shock Property of Si₃N₄ Ceramic Reinforced by Orientation SiC Whiskers[J]. Journal of Inorganic Materials.

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Preparation and Thermal Shock Property of Si₃N₄ Ceramic Reinforced by Orientation SiC Whiskers

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