Reaction Mechanism and Microstructure Evolution of Reaction Sintered h-BN

来源 :武汉理工大学学报(材料科学版)(英文版) | 被引量 : 0次 | 上传用户:liongliong504
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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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