(1. 中原工學院 材料與化工學院，鄭州 450007；
2. 南京航空航天大學 機電學院，南京 210016)
摘 要: 采用Ni-Cr合金在不同溫度下進行釬焊單晶金剛石磨粒試驗，使用SEM、EDS和XRD對Ni-Cr合金釬焊金剛石的碳化物生長及形貌進行分析。結(jié)果表明：真空釬焊過程中，在Ni-Cr合金完全熔化前，在合金前端有碳化物開始形核，并生成排列整齊的Cr3C2和無序的SiC，Cr3C2的生長方向與金剛石的外露晶面有一定的位向關(guān)系；合金完全熔化后，在金剛石表面生成兩層碳化物，內(nèi)層為排列整齊的Cr3C2，外層為無序的Cr7C3。
關(guān)鍵字: 真空釬焊；金剛石；碳化物；位向關(guān)系；晶面
（1. School of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China;
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract:In the experiments on vacuum brazing diamond with Ni-Cr alloy at different temperatures, the morphology and growth of carbide that was formed on the diamond surface were observed with scanning electron microscope(SEM) and the components were analyzed with energy dispersion spectroscope(EDS). The results show that during vacuum brazing, before Ni-Cr alloy is not melted completely, some carbides begin to nucleate in the front of the filler, and then form good order Cr3C2 and disorder SiC until the filler melts. There is a certain orientation relationship between the growth of Cr3C2 and the diamond crystal plane. After the filler is melted, two layers of carbide are formed on the diamond surface, the inner layer is order Cr3C2, and the outer layer is disorder Cr7C3.
Key words: vacuum brazing; diamond; carbide; orientation relationship; crystal plane
