(1. 哈爾濱工業(yè)大學(xué) 現(xiàn)代焊接生產(chǎn)技術(shù)國家重點實驗室, 哈爾濱 150001；
2. 哈爾濱理工大學(xué) 機(jī)械動力工程學(xué)院, 哈爾濱 150080)
摘 要: 研究了金剛石釬焊接頭中碳化物形成元素Ti與金剛石(或石墨)之間的相互作用行為。通過對接頭界面處的成分分布和斷口形貌觀察，分析了Ti的作用機(jī)理、新生化合物TiC的斷口形式及生長規(guī)律。結(jié)果表明：在一定的條件下，Ti元素與組成金剛石(或石墨)的碳元素發(fā)生反應(yīng)形成TiC層；碳化物層使釬料與金剛石之間產(chǎn)生冶金結(jié)合；TiC 與金剛石之間存在有明顯的界面，TiC斷口的微觀表面形態(tài)呈韌窩狀；在金剛石表面初始形成的TiC的生長方向與金剛石的晶向指數(shù)有關(guān)。
關(guān)鍵字: 金剛石； 釬焊； Ag-Cu-Ti
brazed joint of diamond
（1. National Key Laboratory of Advanced Welding Production Technology，
Harbin Institute of Technology， Harbin 150001， P.R.China;
2. Department of Mechanical Engineering， Harbin University of Science and Technology，
Harbin 150080， P.R.China）
Abstract:The effect of Ti in the brazing joint of diamond (or graphite) was studied by SEM， electron probe and X-ray diffractometer. The distribution of composition and fracture morphologies in the interface were analyzed. The behaviour mechanism of Ti and the growth mode of TiC were investigated. The results show that TiC is formed by reaction between Ti in the brazing alloy and C in the diamond under controlled condition; TiC joins the brazing alloy and diamond surface strongly. The clear interface is found between TiC and diamond surface on the fracture morphologies. The surface of TiC appears a lot of tough holes. The growth direction of TiC on the surface of diamond at the beginning is involved in crystal lattice parameter of diamond grains perhaps.
Key words: diamond; brazing; Ag-Cu-Ti
