激光钎焊金刚石磨粒界面微结构分析  

Analysis on interfacial microstructure of laser brazing diamond grits

作　　者：杨志波[1] 徐九华[2] 刘爱菊[1] 

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454000 [2]南京航空航天大学机电学院,南京210016

出　　处：《焊接学报》2010年第10期9-12,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50175052);河南省教育厅自然科学基金资助项目(2009B460005);河南理工大学博士基金资助项目(B2009-79)

摘　　要：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)对钎焊金刚石试样进行理化分析,探讨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,在钢基体结合界面上Ni-Cr合金钎料和钢基体中的元素相互扩散形成化学冶金结合.Diamond grits was brazed to steel substrate by using Ni-based filler alloy via laser in an argon atmosphere.The brazed diamond grits were detected by scanning electron microscopes (SEM),X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS).The formation mechanism of carbide layers between the brazing filler metal and the diamond was discussed.All the results indicate that high strength bonding between diamond grits and the steel substrate has been successfully realized because the chromium in the Ni-based alloy segregated preferentially to the surface of the diamond to form a chromium-rich reaction product,and the bond between the alloy and the steel substrate is established through a cross-diffusion of iron and Ni-based alloy.

关 键 词：激光钎焊 金刚石 NI基合金 界面微结构 

分 类 号：TG74[金属学及工艺—刀具与模具]