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采用AgCuNiLi钎料对TiC金属陶瓷与GH3128镍基高温合金进行钎焊。结果表明:当钎焊温度为840℃,保温10min时,接头典型界面结构可以表示为:TiC金属陶瓷/(Cu,Ni)/Ag(s.s)+Cu(s.s)/(Cu,Ni)/GH3128。随着钎焊温度的升高或保温时间的延长,TiC金属陶瓷附近的(Cu,Ni)固溶体层厚度增大,且向钎料内部呈树枝状长大,钎料内部的Ag-Cu共晶组织逐渐减少。界面机理分析表明:钎料中Li的加入能促进界面上(Cu,Ni)固溶体的形成;但(Cu,Ni)固溶体的继续长大则受钎料中Cu元素的扩散程度控制。当加热温度由810℃升高到960℃,接头抗剪强度呈现先增大,然后缓慢减小的变化趋势。当加热温度为880℃、保温时间为10min时,接头抗剪强度达到最大值204MPa。
Adopt AgCuNiLi brazing filler metal to braze TiC cermet and GH3128 nickel base superalloy. The results show that the typical interface structure of the joint can be expressed as TiC cermet / (Cu, Ni) / Ag (ss) + Cu (ss) / (Cu, Ni) / GH3128 when the brazing temperature is 840 ℃, . With the increase of brazing temperature or holding time, the thickness of (Cu, Ni) solid solution layer near the TiC cermet increases, and the dendrite grows to the inside of the brazing filler metal. The Ag-Cu eutectic Organization gradually reduced. The analysis of the interface mechanism shows that the addition of Li into the brazing filler metal can promote the formation of (Cu, Ni) solid solution on the interface. However, the continuous growth of (Cu, Ni) solid solution is controlled by the diffusion of Cu in the brazing filler metal. When the heating temperature increases from 810 ℃ to 960 ℃, the shear strength of the joint first increases, then slowly decreases. When the heating temperature is 880 ℃, holding time is 10min, the joint shear strength reaches the maximum of 204MPa.