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采用Ni基合金钎料,在Ar气保护条件下,对金刚石磨粒进行了激光钎焊试验研究。采用扫描电镜(SEM)和能谱仪(EDS)及X射线衍射仪(XRD)分析金刚石磨粒与Ni基钎料结合界面的组织结构与物相组成,并探讨了钎料与金刚石界面处碳化物的形成机理。测试结果表明,激光钎焊过程中在金刚石表面附近形成的富Cr层与金刚石表面的C元素反应生成碳化物Cr3C2,通过反应热力学与动力学分析显示界面反应产物可以依靠置换反应形成,使金刚石磨粒与钎料实现了牢固结合。
Ni brazing alloys were used to study the laser brazing of diamond grains under Ar gas protection conditions. The microstructure and phase composition of the interface between the diamond abrasive grains and the Ni-based solder were analyzed by SEM, EDS and XRD. The effects of carbonization Material formation mechanism. The results show that the Cr-rich layer formed near the surface of the diamond during the laser brazing process reacts with the C element on the surface of the diamond to form the carbide Cr3C2. The thermodynamic and kinetic analysis shows that the interfacial reaction products can be formed by displacement reaction, Grain and solder to achieve a solid combination.