【摘要】 采用氩气保护无焊料电弧焊接方法,实现了以 Ti₃AlC₂和 Cu 为原料反应复合的Ti₃C₂/Cu（Al）金属陶瓷材料之间的牢固连接。研究了在氩气保护下焊接电流、拉弧时间和接合压力的施加条件,并对焊缝及其影响区的显微组织进行了观察和分析。结果表明:在适当的焊接电流、拉弧时间和接合压力下,焊接面之间形成了良好的熔合,焊缝及影响区的致密度显著增大。在较低的Ti3C2陶瓷相含量情况下,焊缝区的 Ti₃C₂相形态没有显著变化,焊接件的三点弯曲强度达到母材强度的110%,断裂大多发生在焊缝及其影响区之外。在较高的 Ti₃C₂陶瓷相含量情况下,焊缝区内 Ti₃C₂颗粒明显变细,形成细小的 Ti₃C₂颗粒均匀弥散于 Cu（Al）合金网络结构的特殊显微形貌,焊接件的三点弯曲强度达到母材强度的93%,断裂基本发生在焊缝或影响区与母材的交界处附近。更多还原

【Abstract】 Two Ti₃C₂/Cu（Al）cermets were firmly jointed using an argon arc welding method without solder.The requirements for applying the welding current,arc time and joint pressure were studied,and the welded seam and the influence zones’ microstructure were observed and analyzed.The results show that in an appropriate combined condition of the current density,the arc time and the joint pressure,a good fusion can be formed between the welding faces,and the material density of the welded seam and its influence zones can be remarkably increased.In the case of a lower Ti₃C₂ content,the shape of Ti₃C₂ particulates almost can not change after the welding,the bending strengths of most jointed samples can reach up to 110% of the base material,and the fractures occur outside the welded seam and its influence zone.Howev- er,in the case of a higher Ti₃C₂ content,the Ti₃C₂ particulates contained in the welded seam are obviously thinned and uniformly dispersed in the network making up of Cu（Al）alloy phase,but the bending strength of the jointed sample only reaches about 93 % of the base material.更多还原