采用Ni-Cr合金在不同温度下进行钎焊单晶金刚石磨粒试验,使用SEM、EDS和XRD对Ni-Cr合金钎焊金刚石的碳化物生长及形貌进行分析.结果表明:真空钎焊过程中,在Ni-Cr合金完全熔化前,在合金前端有碳化物开始形核,并生成排列整齐的Cr_3C_2和无序的SiC,Cr_3C_2的生长方向与金刚石的外露晶面有一定的位向关系;合金完全熔化后,在金刚石表面生成两层碳化物,内层为排列整齐的Cr_3C_2,外层为无序的Cr_7C_3.
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 Cr_3C_2 and disorder SiC until the filler melts. There is a certain orientation relationship between the growth of Cr_3C_2 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 Cr_3C_2, and the outer layer is disorder Cr_7C_3.
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