(长沙矿冶研究院，长沙410012)
摘 要: 采用SEM和EPA技术对NiFeMn触媒合金在金刚石合成中的一些现象作了研究并探讨了触媒合金在高压合成下的作用机理。研究表明，经高温高压合成后NiFeMn触媒片表面存在局部成份起伏，Fe原子在金属/石墨界面及金属/金刚石界面富集；这种成份(浓度)起伏对金刚石晶体的形核与生长都有一定影响。
关键字: 成份起伏 金刚石 触媒合金 合成机理
（Changsha Research Institute of Mining and Metallurgy，Changsha 410012）
Abstract:Some phenomena of NiFeMn catalyst occurred during the growth of synthetic diamond from liquid-metal catalyst，have been studied by means of SEM and EPA methods，and the mechanism of the catalyst in dia-mond synthesis has been brought forward in this paper. The results showed that a local composition gradient might
be observed in catalyst surface during diamond growth at high temperature and pressure, and Fe element accumu-fated in metal/graphite and metal/diamond boundaries. This composition segregation plays an important part in di-amond crystal nucleation and growth process and benefits the carbon atoms migration in metal-catalyst as well.
Key words: Ni-base catalyst diamond synthesis composition gradient
