Ni基钎料激光钎焊金刚石磨粒界面显微结构及形成机理  

Delaminating Behavior and Formation Mechanism of the Interfacial Microstructure in the Laser Brazing Diamond with Ni-Cr Alloys

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,江苏南京210016

出　　处：《中国激光》2009年第11期3079-3083,共5页Chinese Journal of Lasers

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

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)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。Brazing diamond grits to steel substrate using Ni-based filler alloy was carried out via laser in an argon atmosphere. The brazed diamond grits were detected by scanning electron microscopes （SEM）,X-ray diffractomer （XRD） and X-ray energy dispersive spectroscopy （EDS）. The formation mechanism of carbide layers 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 Cr3C2,and the bond between the alloy and the diamond is established through the reaction product.

关 键 词：激光技术 激光钎焊 NI基合金 界面微结构 反应机理 

分 类 号：TG74[金属学及工艺—刀具与模具]