Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
700957 | Diamond and Related Materials | 2009 | 5 Pages |
Abstract
Hexagonal BN (h-BN) particles were prepared by using BBr3, NH4Br and metallic Na as reactants in stainless steel autoclaves at 450 ºC for 24 h; When the target temperature was set in the range of 500–600 ºC, cubic BN (c-BN) particles that co-existed with h-BN were obtained. It is found that 600 ºC and a molar ratio of BBr3 to NH4Br of 1:3 are the optimal reaction parameters for the highest yield production of c-BN particles. c-BN powder with controllable content has been synthesized through a one-step method in the absence of solvents. The as-obtained samples that contain pure h-BN and the mixture of c-BN and h-BN have high thermal stabilities in ambient atmosphere below 920 and 1100 ºC, respectively.
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Authors
Menghua Li, Liqiang Xu, Lishan Yang, Zhongchao Bai, Yitai Qian,