Reaction Mechanism and Microstructure Evolution of Reaction Sintered h-BN
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2017年第2期
论文作者：高晓菊 ZHANG Cong MAN Peng CHANG Yongwei ZHAO Bin FANG Zhijian 成来飞
文章页码：345 - 348
摘 要：Hexagonal boron nitride ceramic（h-BN） based on the nitridation of B powders was obtained by reaction sintering method. The effects of sintering temperature on the mechanical properties and microstructure of the resultant products were investigated and the reaction mechanism was discussed. Results showed that the reaction between B and N2 occurred vigorously at temperatures ranging from 1 000 ℃ to 1 300 ℃, which resulted in the generation of t-BN. When the temperature exceeded 1 450 ℃, transformation from t-BN to h-BN began to occur. As the sintering temperature increased, the spherical particles of t-BN gradually transformed into fine sheet particles of h-BN. These particles subsequently displayed a compact arrangement to achieve a more uniform microstructure, thereby increasing the strength.
高晓菊1,2，ZHANG Cong2，MAN Peng2，CHANG Yongwei2，ZHAO Bin2，FANG Zhijian2，成来飞1
1. Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University2. No.52 Institute of China North Industry Group
摘 要：Hexagonal boron nitride ceramic（h-BN） based on the nitridation of B powders was obtained by reaction sintering method. The effects of sintering temperature on the mechanical properties and microstructure of the resultant products were investigated and the reaction mechanism was discussed. Results showed that the reaction between B and N2 occurred vigorously at temperatures ranging from 1 000 ℃ to 1 300 ℃, which resulted in the generation of t-BN. When the temperature exceeded 1 450 ℃, transformation from t-BN to h-BN began to occur. As the sintering temperature increased, the spherical particles of t-BN gradually transformed into fine sheet particles of h-BN. These particles subsequently displayed a compact arrangement to achieve a more uniform microstructure, thereby increasing the strength.
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