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Research Article | Open Access

Fabrication and mechanical properties of self-toughening ZrB2-SiC composites from in-situ reaction

Zhaofu ZHANG, Jianjun SHA( ), Yufei ZU, Jixiang DAI, Yingjun LIU
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
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Abstract

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.

Keywords

ultrahigh temperature ceramicin-situ reactioninterlocking microstructuremechanical property

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Journal of Advanced Ceramics
Volume 8 Issue 4,
December 2019
Pages 527-536
DOI: 10.1007/s40145-019-0334-4

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ZHANG Z, SHA J, ZU Y, et al. Fabrication and mechanical properties of self-toughening ZrB2-SiC composites from in-situ reaction. Journal of Advanced Ceramics, 2019, 8(4): 527-536. https://doi.org/10.1007/s40145-019-0334-4

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Received: 26 October 2018
Revised: 15 April 2019
Accepted: 22 April 2019
Published: 04 December 2019
© The author(s) 2019

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