Ni-Cr合金钎料激光钎焊金刚石磨粒界面显微结构及形成机理（英文）  

Interface Microstructure and Formation Mechanism of Diamond Abrasives Laser Brazed with Ni-Cr Solder

作　　者：杨志波[1] 刘爱菊[1] 杨瑞云[1] 张振[1] 刘石安[1] 

机构地区：[1]河南理工大学,河南焦作454000

出　　处：《稀有金属材料与工程》2016年第5期1152-1156,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(U1204517)

摘　　要：采用Ni-Cr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-Cr钎料结合界面的组织结构与物相组成,并研究了钎料与金刚石界面处碳化物的形成机理。结果表明,激光钎焊过程中,在金刚石表面形成的富Cr层与金刚石表面的C元素反应生成碳化物Cr_3C_2。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。The laser brazing of diamond abrasives was investigated using Ni-based solder in an Ar atmosphere. The microstructure and the phase composition of the interface between diamond abrasives and Ni-based solder were analyzed using scanning electronic microscopy（SEM）, energy dispersive spectroscopy（EDS） and X-ray diffraction（XRD）. Meanwhile, the formation mechanism of carbides at the interface between solder and diamond abrasives was discussed. The results indicate that during laser brazing, the Cr-enriched layer around the diamond surface reacts with C in the diamond surface and consequently Cr3C2 is formed. Based on reaction thermodynamic and kinetic analysis, it is revealed that the interface reaction products can be formed via replacement reaction, which realize the tight combination between diamond abrasives and solder.

关 键 词：激光钎焊 NI-CR合金 界面微结构 反应机理 

分 类 号：TG454[金属学及工艺—焊接]