镍基钎料真空钎焊镀钨金刚石的研究  

Research on vacuum brazing of W-coated diamond with Ni-based filler alloy

作　　者：王树义 肖冰[1] 肖皓中 孟祥龙 WANG Shuyi;XIAO Bing;XIAO Haozhong;MENG Xianglong(College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]南京工业大学机械与动力工程学院,南京210016

出　　处：《金刚石与磨料磨具工程》2023年第2期202-209,共8页Diamond & Abrasives Engineering

基　　金：江苏省产学研合作创新项目资助项目(BY2016003-15)。

摘　　要：为减轻镍基钎料真空钎焊金刚石接头的热损伤与残余应力,采用镀钨金刚石磨粒代替常规金刚石磨粒并将其钎焊到1045钢基体上,对钎焊镀钨金刚石接头的连接性能、热损伤程度及残余应力进行深入研究与分析。结果表明:镍基钎料对镀钨金刚石磨粒展现出良好的润湿性,与钎焊常规金刚石接头相比,钎焊镀钨金刚石接头在结合界面处的裂纹数量及尺寸明显减小。常规金刚石表面生成了致密有序的板条状Cr_(3)C_(2)层,而镀钨金刚石表面则形成了向钎料中生长的无序粒状Cr_(3)C_(2)层。在镀层的隔离保护作用下,钎焊后的镀钨金刚石磨粒表面的石墨化程度更低,力学性能更优异。同时,镀钨金刚石表面更薄、形貌更合理的Cr_(3)C_(2)层有效地缓解了镀钨金刚石接头内部的残余应力,其最大残余压应力相较于常规金刚石的降低9.43%。In order to alleviate the thermal damage and residual stresses of brazed diamond joints with Ni-based filler,W-coated diamond grains were used instead of conventional diamond grains and brazed onto 1045 steel substrates.The bonding interface properties,thermal damage and residual stresses of brazed W-coated diamond joints were investigated and studied.The results showed that the Ni-based filler exhibited good wettability to the W-coated diamond grains,and that the number and size of cracks at the bond interface of brazed W-coated diamond joints were significantly reduced compared with those of brazed conventional diamond joints.A dense and orderly Cr_(3)C_(2) layer was generated on the surface of conventional diamond,while the disordered granular Cr_(3)C_(2) growing into the filler alloy was formed on the surface of W-coated diamonds.With the isolation and protection of the coating,the brazed W-coated diamond grain surface has lower graphitization and better mechanical properties.At the same time,the thinner and more reasonable morphology of Cr_(3)C_(2) layer on the surface of W-coated diamond effectively relieves the residual stress,and its maximum residual compressive stress is reduced by 9.43% compared with that of conventional diamond.

关 键 词：钎焊 镀钨金刚石 连接界面 热损伤 残余应力 

分 类 号：TQ164[化学工程—高温制品工业]