Ti(C,N)-Al_2O_3与40Cr焊接界面组织与接头强度研究

Study on the welding interface microstructure and joint strength of Ti(C,N)-Al_2O_3 and 40Cr

采用Cu73Ti27/Cu/Ag72Cu28非对称中间层,通过辅助脉冲电流液相扩散焊和常规钎焊,对Ti(C,N)-Al_2O_3陶瓷基复合材料和40 Cr钢进行了焊接试验,利用扫描电镜研究了焊接界面的微观组织及元素扩散行为.结果表明:辅助脉冲电流液相扩散焊可以减少焊缝中Cu-Ti金属间化合物的生成量,从而提高焊接接头的强度;液相区宽度随着焊接温度的提高而增加.而常规钎焊因为焊接温度较高,保温时间较长,易生成大量的Cu-Ti金属间化合物,降低了接头强度.

Ti(C,N)-Al2O3 ceramic matrix composite and 40Cr steel were joined by Cu73Ti27 brazing alloy with the method of the auxiliary pulse current liquid phase diffusion welding and vacuum brazing.The scanning electronic microscope was employed to investigate the microstructure.The results show that the auxiliary pulse current liquid phase diffusion welding can reduce the content of Cu-Ti intermetallic compound in weld seam to improve the strength of joints.Meanwhile,the higher the temperature is,the wider the width of the molten zone will be.By contrast,vacuum brazing may produce more Cu-Ti intermetallic compound because its high temperature and long time to reduce the strength of joints.