Sintering Processing and Mechanical Properties of In-situ Reaction-Synthesized Zr2Al4C5-toughened ZrB2-SiC Composite Ceramics
GUO Qilong1,2,3, WANG Xiaoqing1, WANG Jing1, PEI Junjun2, LI Junguo3, ZHANG Lianmeng3
1 School of Civil Engineering, Northwest Minzu University, Lanzhou 730124, China 2 Key Laboratory of New Building Materials and Building Energy Efficiency of Gansu Province, Lanzhou 730124, China 3 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
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·m1/2. The toughening mechanisms include crack deflection, crack branching, crack bridging and layered Zr2Al4C5 grain pull-out.
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2021, Vol. 35 
