(1. 江苏理工学院 机械工程学院，常州 213001；
2. 南京航空航天大学 机电学院，南京 210016)
摘 要: 采用超高频感应连续钎焊工艺，在不同扫描速度条件下实现了立方氮化硼(CBN)磨粒、Ag-Tu-Ti合金以及基体三者之间的钎焊连接。采用扫描电子显微镜(SEM)和X射线能谱仪(EDX)观察钎焊后的CBN磨粒界面新生化合物形貌。结果表明：随着扫描速度的变化，在CBN磨粒表面生成颗粒状TiN化合物以及针状和六棱柱状的TiB2化合物。其中，TiN尺寸为100 nm左右，而TiB2尺寸小于200 nm。在超高频感应连续钎焊CBN磨粒表面首先生成颗粒状TiN层，然后在TiN层外围形成柱状TiB2层，最终形成CBN/TiN/TiB2/钎料结构。当扫描速度为0.5 mm/s时，可以获得较好的界面新生化合物层结构。
关键字: Ag-Cu-Ti合金；超高频感应加热；钎焊；立方氮化硼；界面反应
（1. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract:Continuous brazing with ultra-high frequency induction was proposed to braze the cubic born nitride (CBN) grits and steel substrate based on Ag-Cu-Ti filler alloy. The new compounds morphologies were observed and analogized by scanning electron microscopy (SEM) and energy diffraction X-ray (EDX). The results show that, with the variation of scanning speed, granular compounds TiN about 100 nm in size, the needle-like and prismatic compounds TiB2 less than 200 nm in size are observed, respectively. The theoretical analysis results reveal that, during continuous brazing by ultra-high frequency induction, granular TiN layer forms on the surface of CBN firstly, and then, prismatic TiB2 layer forms on the outside of the new TiN layer. The joint is CBN/TiN/TiB2/filler structure, finally. A satisfactory interfacial structure can be obtained when scanning speed is 0.5 mm/s.
Key words: Ag-Cu-Ti alloy; ultra-high frequency induction heating; brazing; cubic born nitride (CBN); interfacial reaction
