原位反应烧结Zr2Al4C5化合物增韧ZrB2-SiC复相陶瓷的制备工艺及力学性能

doi:10.11896/cldb.20020026

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Abstract ZrB₂-SiC composite ceramics have significant application prospects in the fields of ultra-high temperature, but their low toughness has limited the practical application. In this work, the in-situ synthesized Zr₂Al₄C₅ improves the toughness of ZrB₂-SiC composite ceramics sintered by spark plasma sintering, and the effects of Zr/Al molar ratio and sintering parameters on the densification behavior, microstructure and mechanical properties were studied. The results indicate that the amount of in-situ synthesized Zr₂Al₄C₅ compounds increases with decreasing Zr/Al molar ratio. The Zr₂Al₄C₅ compounds gradually forms as increasing the sintering temperature. As the sintering pressure and holding time increase, the open porosity of the multiphase ceramics decreases, while the fracture toughness firstly increases and then decreases. The in-situ reaction-synthesized Zr₂Al₄C₅-toughened ZrB₂-SiC composite ceramic, with a Zr/Al molar ratio of 2:6 and at a sintering temperature of 1 800 ℃ and under a sintering pressure of 20 MPa for a holding time of 3 min, exhibits a good fracture toughness of (5.26±0.37) MPa·m^1/2. The toughening mechanisms include crack deflection, crack branching, crack bridging and layered Zr₂Al₄C₅ grain pull-out.

Key words： ZrB₂-SiC ceramic Zr/Al molar ratio sintering process

Published: 23 March 2021

CLC number:

TQ174.75

Fund:State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Techno-logy) (2019-KF-7), and the Special Funds for Introducing Talents from Northwest Minzu University (Z14013).

About author:: Qilong Guo received his Ph.D. degree in June 2013 from Wuhan University of Technology. He is currently an associate professor in Northwest Minzu University. His research interests focus on the design, preparation, performance evaluation and application research of ultra-high temperature ceramic materials. He has published more than 20 journal papers as the first author, applied 3 national invention patents and 1 of them were autho-rized.

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	GUO Qilong
	WANG Xiaoqing
	WANG Jing
	PEI Junjun
	LI Junguo
	ZHANG Lianmeng

Cite this article:

GUO Qilong,WANG Xiaoqing,WANG Jing, et al. Sintering Processing and Mechanical Properties of In-situ Reaction-Synthesized Zr₂Al₄C₅-toughened ZrB₂-SiC Composite Ceramics[J]. Materials Reports, 2021, 35(6): 6065-6070.

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http://www.mater-rep.com/EN/10.11896/cldb.20020026 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6065

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