Microstructures and properties of SiB0.5C1.5N0.5 ceramics consolidated by mechanical alloying and hot pressing

Nanostructured SiB0.5C1.5N0.5 ceramics were formed by two routes of mechanical alloying and consolidated by hot pressing. Nano-sized 6H-SiC, 3C-SiC and BCN were the main phases for two SiB0.5C1.5N0.5 ceramics. For the SiBCN ceramics fabricated from the powders milled by one-step milling, the content...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-08, Vol.489 (1-2), p.187-192
Main Authors: Yang, Zhi-Hua, Zhou, Yu, Jia, De-Chang, Meng, Qing-Chang
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Language:English
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description Nanostructured SiB0.5C1.5N0.5 ceramics were formed by two routes of mechanical alloying and consolidated by hot pressing. Nano-sized 6H-SiC, 3C-SiC and BCN were the main phases for two SiB0.5C1.5N0.5 ceramics. For the SiBCN ceramics fabricated from the powders milled by one-step milling, the content of 6H-SiC is higher than that of ceramic fabricated from the powders milled by two-step milling. The flexural strengths for the former and latter were 312.8 MPa and 423.4 MPa at room temperature, respectively. At high temperature, the strengths of the former reduced 8.2% and 28.0% at 1000 deg C and 1400 deg C, respectively. The reduction rates of strengths for the latter were 11.3% and 38.5%, respectively. The average thermal expansion coefficients of two SiBCN ceramics consolidated at 1900 deg C were about 4.5 X 10-6/ deg C.
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title Microstructures and properties of SiB0.5C1.5N0.5 ceramics consolidated by mechanical alloying and hot pressing
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