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论文类型：期刊论文

发表时间：2019-12-01

发表刊物：JOURNAL OF ADVANCED CERAMICS

收录刊物：SCIE

卷号：8

期号：4

页面范围：527-536

ISSN号：2226-4108

关键字：ultrahigh temperature ceramic; in-situ reaction; interlocking microstructure; mechanical property

摘要：Self-toughening ZrB2-SiC based composites are fabricated by in-situ reactive hot pressing. The effect of sintering additive content on the microstructure and mechanical properties of the composites is investigated. Microstructure observation found that the in-situ reactive hot pressing could promote the anisotropic growth of ZrB2 grains and the formation of interlocking microstructure. Such microstructure could improve the mechanical properties, especially, for the fracture toughness. The improved mechanical properties could be attributed to the self-toughening structure related to the ZrB2 platelets and the formed interlocking microstructure, which could trigger various toughening mechanisms such as grain pull-out, crack bridging, crack deflection, and crack branching, providing the main contribution to the high fracture toughness.