Ni–Cr钎料钎焊镀钛CBN界面微观结构分析  

Analysis on interface microstructure of Ni-Cr filler brazed Ti coated CBN

作　　者：王君临 肖冰[1] 王树义 苏仕超 浦一子 高睿 WANG Junlin;XIAO Bing;WANG Shuyi;SU Shichao;PU Yizhi;GAO Rui(Mechanical and Electrical College, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《金刚石与磨料磨具工程》2020年第6期31-35,共5页Diamond & Abrasives Engineering

摘　　要：采用Ni–Cr钎料真空钎焊镀钛CBN磨粒和45号钢。用扫描电子显微镜、能谱仪、X射线衍射仪综合分析镀钛CBN磨粒的焊后形貌,磨粒与Ni–Cr钎料连接界面的微观结构和钎焊后磨粒表面的生成物。发现:钎焊过程中Ni–Cr钎料沿钛镀层爬升,对磨粒浸润性良好。焊后CBN磨粒出露部分的钛镀层在Ni原子的扩散下转变为Ni–Ti金属层。而在钎料包埋处,磨粒的钛镀层在钎焊过程中与CBN、Ni–Cr钎料相互扩散反应,生成了一层以NiTi和Ni0.3Ti0.7N为主的中间层,实现镀钛CBN磨粒和Ni–Cr钎料的冶金结合。Ni-Cr filler was used to braze Ti coated CBN abrasive and AISI1045 steel in vacuum.SEM,EDS and XRD were used to analyze the morphology of Ti coated CBN abrasive particles after brazing,the microstructure of the interface between CBN and Ni-Cr filler,and the surface products of abrasive after brazing.During the brazing process,Ni-Cr filler climbs the CBN particles along the Ti coating and has good wettability to the abrasive.After brazing,the Ti coating on the exposed part of CBN grains transforms into Ni-Ti metal layer under the diffusion of Ni atoms.However,in the area where the grains are embedded in the filler,the Ti coating of the abrasive diffuses with CBN and Ni-Cr filler during the brazing process,forming an intermediate layer mainly composed of NiTi and Ni0.3Ti0.7N,which realizes the metallurgical bonding of Ti coated CBN abrasive and Ni-Cr filler.

关 键 词：钎焊 Ni–Cr钎料 镀钛CBN 界面微观结构 

分 类 号：TG74[金属学及工艺—刀具与模具] TG401