(長(zhǎng)沙礦冶研究院，長(zhǎng)沙410012)
摘 要: 采用SEM和EPA技術(shù)對(duì)NiFeMn觸媒合金在金剛石合成中的一些現(xiàn)象作了研究并探討了觸媒合金在高壓合成下的作用機(jī)理。研究表明，經(jīng)高溫高壓合成后NiFeMn觸媒片表面存在局部成份起伏，F(xiàn)e原子在金屬/石墨界面及金屬/金剛石界面富集；這種成份(濃度)起伏對(duì)金剛石晶體的形核與生長(zhǎng)都有一定影響。
關(guān)鍵字: 成份起伏 金剛石 觸媒合金 合成機(jī)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
