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摘要: 将3种不同初始结晶度的六方氮化硼(h-BN)分别与Li3N按一定比例混合,在低于立方氮化硼(c-BN)的合成温度和压力条件下,采用高温、高压预处理方式,使3种h-BN的结晶度发生改变。对不同预处理条件下得到的h-BN进行X射线衍射分析,确定了结晶度的变化程度。用不同结晶度的h-BN作为初始原料合成c-BN,观察并分析了h-BN向c-BN转化时微观结构的变化以及h-BN的结晶度对合成c-BN的影响。实验结果表明,结晶度低的h-BN更容易合成c-BN。Abstract: High pressure and temperature pretreatments were employed for the mixture of Li3N and hexagonal boron nitride (h-BN) powders with different crystallization degrees. Using the pretreated h-BN and Li3N, the cubic boron nitride (c-BN) was synthesized by a cubic-anvil press. According to the X-ray diffraction (XRD) data, both the crystallization degree change of the pretreated h-BN and the microstructure transition from h-BN to c-BN were analyzed. The experimental results indicated that h-BN possessing lower crystallization degree was easier to transform into c-BN.
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Key words:
- h-BN /
- crystallization degree /
- c-BN /
- synthesis
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