含硼触媒对合成的金刚石晶体结构和热稳定性的影响

Influence of Boron-doped Catalyst on Crystal Structure and Thermal Stability of Synthetic Diamond

人造金刚石的热稳定性越来越受到金刚石生产者和使用者的重视,成为国际上评价金刚石内在质量和性能好坏的重要指标。本文在铁基触媒的基础上加入不同含量的硼铁粉,用静压法合成了含硼金刚石。利用光学显微镜、X射线衍射仪和差热分析仪对不同金刚石的晶形、晶体结构和抗氧化性能进行了研究,并与同样工艺条件下合成的不含硼金刚石进行对比,对某些实验现象做了讨论。实验证明,这种方法能够得到抗氧化性好的金刚石,而且生产成本低、操作方便,便于推广。

Thermal stability of synthetic diamond attract more and more attentions of diamond producers and users, which has been an important guide line to evaluate the quality and performances of synthetic diamond in the world. In this paper different concentrations of iron boride powders were put into the iron - based metal catalyst to get different kinds of boron-doped diamonds with high thermal stability under high temperature and high pressure conditions. The optics microscope, X-ray diffractometer and different thermal analyzer were carried out to investigate the morphology, crystal structure and oxidation resistance of different kinds of boron-doped diamonds. The experimental results demonstrate that the diamonds with high oxidation resistance can be obtained by controlling the boron concentration in the metal catalyst, which is good for large scale production because of low cost and convenient operation.