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大颗粒多晶金刚石已迅速应用于地质、冶金和石油钻探等工业部门中。目前在高温高压下制作大颗粒多晶金刚石,通过两种途径:一种是由石墨合成金刚石,再由金刚石微粉烧结而成。另一种,则是直接由石墨一次长成多晶金刚石。前一种方法已由科研进入到广泛的工业生产,而后一种,虽然开始得早,由于技术困难等原因,仍处于科研的实验阶段。探索这种金刚石的生长条件和机制,在理论和生产应用上都有其重要意义。本文就生长多晶金刚石的一些实验结果和扫描电镜观察分析,作一初步研究报道。
Large particles of polycrystalline diamond have been rapidly used in the industrial sectors such as geology, metallurgy and oil drilling. At present, the production of large particles of polycrystalline diamond at high temperature and pressure through two ways: one is the synthesis of graphite from graphite, and then sintered from the diamond powder. Another, it is directly from the graphite grew into polycrystalline diamond. The former method has entered into a wide range of industrial production from scientific research, and the latter, though it started early, is still in the experimental stage of scientific research due to technical difficulties and other reasons. Exploring the growth conditions and mechanism of this kind of diamond is of great significance both in theory and in production. In this paper, some experimental results of the growth of polycrystalline diamond and scanning electron microscope observation and analysis, make a preliminary study reported.