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| Effect of Infiltration- and Pyrolyzation-Treatment on Mechanical Properties of Pressureless Sintered SiC/h-BN Ceramics |
Wanli YANG1,2( ), Lina DAI1, Zhongqi SHI2, Zhichao XIAO1, Xuhui ZHANG1 |
1 Chaoma Technology Co. Ltd, Xi’an Aerospace Composites Research Institute, Xi'an 710025, China
2 State Key Laboratory for Mechanical Behavior of Materials, School of Material Science and Engineering, Xi'an Jiao Tong University, Xi'an 710049, China |
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Cite this article:
Wanli YANG, Lina DAI, Zhongqi SHI, Zhichao XIAO, Xuhui ZHANG. Effect of Infiltration- and Pyrolyzation-Treatment on Mechanical Properties of Pressureless Sintered SiC/h-BN Ceramics. Chinese Journal of Materials Research, 2017, 31(8): 635-640.
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Abstract Composites of SiC/h-BN ceramic were fabricated by pressureless sintering at 1700oC for 2 h. The sintered samples were alternately infiltrated with solutions of silica sol and phenolic in vacuum, and then pyrolyzed at 1450oC for 1 h. The density, flexural strength and Vickers hardness of SiC/h-BN composites before and after infiltration- and pyrolyzation-treatment were investigated, and the strengthening mechanism of the composites was analyzed. The results show that the relative density and mechanical properties of SiC/h-BN composites were improved significantly after infiltration- and pyrolyzation-treatment, as an example, the relative density of increased from 69.7% to 74.9%, and the flexural strength increased near 1.5 times for the composite SiC/20 mass% h-BN; XRD patterns and microstructure of the prepared composite revealed that the SiC particles formed during the pyrolyzation-treatment were nano-sized, which precipitated on the inner wall of pores of the sintered composite SiC/h-BN, Therewith, of which the resistance to crack propagation along grain boundaries was obviously increased, i.e., the mechanical properties of SiC/h-BN composite were improved.
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Received: 22 April 2016
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| Fund: Supported by National High-tech Research and Development Program (No.2012AA040209) |
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