焊管2026，Vol.49Issue(4)：38-43,6.DOI:10.19291/j.cnki.1001-3938.2026.04.005
钨/铜异种金属钎焊工艺及接头组织性能研究
Study on Brazing Process and Joint Microstructure Properties of Tungsten/Copper Dissimilar Metals
摘要
Abstract
Materials exhibiting significant differences in the physical properties of tungsten and copper pose a substantial technical challenge for achieving reliable metallurgical bonding.Process research was conducted using vacuum brazing combined with a novel Ti-Zr based amorphous filler metal.The influence of brazing temperature on joint microstructure,element distribution,microhardness,and shear strength was comprehensively investigated.The results indicate that at lower brazing temperatures(840～880℃),the welds exhibited pronounced porosity and incomplete fusion.As the temperature increased to 900℃,the weld seam exhibited excellent formation quality;internal porosity was effectively suppressed,microstructural uniformity was significantly enhanced,and a continuous interfacial diffusion layer formed across the joint.The diffusion layer thickness measured approximately 20 µm on the copper side and approximately 10 µm on the tungsten side.The microhardness of the brazed joint exhibits a distinct gradient distribution,increasing progressively from the tungsten substrate to the copper substrate and peaking at 404.8HV0.1 in the interfacial middle layer at a brazing temperature of 900℃.When the brazing temperature is 900℃and the holding time is 30 minutes,ideal metallurgical bonding can be achieved.The interface layers exhibit a continuous and dense microstructure,free from typical defects such as porosity or cracks.The average shear strength of the joint reaches 152.9 MPa.The fracture morphology of the joint and EDS analysis reveal that the fracture surface of this joint presents a mixed fracture mode characterized by quasi-cleavage facets interspersed with ductile dimples and tear ridges.The fracture occurs at the transition zone between tungsten and the brazing filler.关键词
异种金属/真空钎焊/Ti-Zr非晶钎料/钎焊温度/界面结构Key words
dissimilar metals/vacuum brazing/Ti-Zr amorphous filler metal/brazing temperature/interfacial structure分类
矿业与冶金引用本文复制引用
李璐瑶,刘飞,李思源,顾典,李先芬,刘亚东,魏慧东,付宇承..钨/铜异种金属钎焊工艺及接头组织性能研究[J].焊管,2026,49(4):38-43,6.基金项目
合肥工业大学2023年国家级大学生创新创业训练计划"基于核反应堆外壳及高温炉内腔的钨/铜钎焊工艺制备及组织与性能研究"(项目编号202310359099). （项目编号202310359099）
