Porous Si3N4-SiO2 composite ceramic and its properties

Xiangming Li, Xiaowei Yin, Litong Zhang, Laifei Cheng, Yuanchen Qi

科研成果: 期刊稿件文章同行评审

7 引用 (Scopus)

摘要

A Si3N4-SiO2 composite ceramic was fabricated by using a near net-shape preparation method that was a combined process of oxidation-bonding, sol-gel infiltration and sintering. The relationship of the process, composition, microstructure, and properties of the as-received composite ceramic was discussed in detail. The results indicate that with the increase of SiO2 derives from the sol-gel infiltration and sintering process, the flexural strength, hardness, fracture toughness, density, and dielectric constant all increase. The fracture toughness of the as-received composite ceramic was tested by using the Vickers indentation fracture toughness (VIF) and single-edge notched beam (SENB) methods. Crack deflection, crack branching, crack bridging, and the blunting of pores were detected in the Si3N4-SiO2 composite ceramic when the toughness was measured by the VIF method. However, crack deflection was detected in the Si3N4-SiO2 composite ceramic measured by the SENB method.

源语言英语
页(从-至)769-775
页数7
期刊Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society
36
6
出版状态已出版 - 6月 2008

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