采用高钛含量的粉状Ti-Zr-Ni-Cu钎料实现了TC4钛合金的真空钎焊,分析了不同工艺参数对接头高温(600℃)抗拉强度的影响,并借助扫描电镜(SEM)、能谱分析(EDS)和X射线衍射分析等方法研究了钎焊接头界面组织,确定了界面反应产物及其形态分布.结果表明,在界面反应层中生成五种产物:钛基固溶体、Ti2Ni,Ti3Al,CuTi3,Zr2Ni.随着钎焊温度和加热时间的增加,接头抗拉强度呈现先增大再降低的趋势,当钎焊温度为950℃和保温时间为30 min时,获得最大高温(600℃)抗拉强度为387 MPa的钎焊接头.
T titanium alloy was vacuum brazed with Ti-Zr-Ni-Cu powder filler containing high-content titanium, and the effect of different brazing parameters on the tensile strength of the joint at high temperature (600℃) was analyzed. The microstructure of the brazed joint was examined by means of scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). The results show that the brazed seam consisted of a large amount of Ti-based solid solution,Ti2Ni,Ti3Al,CuTi3 and Zr2Ni phases. With the increase of the brazing temperature and holding time,the tensile strength of the joint increased first and then decreased. The maximum tensile strength of the joint at high temperature was 387 MPa when the brazing temperature was 950℃ and the holding time was 30 min.