(1. 江蘇理工學院 機械工程學院，常州 213001；
2. 南京航空航天大學 機電學院，南京 210016)
摘 要: 采用超高頻感應連續(xù)釬焊工藝，在不同掃描速度條件下實現(xiàn)了立方氮化硼(CBN)磨粒、Ag-Tu-Ti合金以及基體三者之間的釬焊連接。采用掃描電子顯微鏡(SEM)和X射線能譜儀(EDX)觀察釬焊后的CBN磨粒界面新生化合物形貌。結(jié)果表明：隨著掃描速度的變化，在CBN磨粒表面生成顆粒狀TiN化合物以及針狀和六棱柱狀的TiB2化合物。其中，TiN尺寸為100 nm左右，而TiB2尺寸小于200 nm。在超高頻感應連續(xù)釬焊CBN磨粒表面首先生成顆粒狀TiN層，然后在TiN層外圍形成柱狀TiB2層，最終形成CBN/TiN/TiB2/釬料結(jié)構。當掃描速度為0.5 mm/s時，可以獲得較好的界面新生化合物層結(jié)構。
關鍵字: Ag-Cu-Ti合金；超高頻感應加熱；釬焊；立方氮化硼；界面反應
（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
