【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。更多还原

【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.更多还原