Ti-30Ni钎缝的界面反应及金相观察

Interface Reaction and Metallographic Observation of a Ti-30Ni Braze Welding Seam

研究了钛在真空钎焊过程中钎焊温度、保温时间及装配间隙对界面反应程度的影响。钎焊过程中钎料组元谋和基体金属钛之间存在着明显的相互扩散过程，即基体金属钛向钎料的溶解和钎料组元镍向基体钛的扩散。镍向钛基体扩散的结果形成了一个明显的扩散层，镍在扩散层内主要以Ti2Ni化合物形式存在，并且存在较大的晶间渗入倾向。

The effects of brazing temperature, holding time and joint clearance on the interface reaction during of titanium vacuumbrazing have been studied. The results show that the interdiffusion takes place between the filler metal and the base titanium duringthe brazing process; the base titanium dissolves into the molten braze alloy and the filler metal in to the base titanium. A nickel-richdiffusion zone is formd between the base titanium and the brazing solder. In it the nickel exists in the form of a Ti2Ni compound, andalso trends to penetrate into the titanium grain boundary.