摘要
借助瞬间液相扩散焊接技术,分别以铬-镍粉、铬-镍-铜压制薄片、锆-镍-钛粉作中间层,于1 650℃下真空保温1 h对钼和石墨进行焊接,对焊接接头进行了剪切试验和微观形貌观察、成分分析。结果表明:钼和石墨在添加以上三种中间层后均可实现焊合,接头有一定强度;其中以锆-镍-钛粉作中间层时所得接头的抗剪强度最大,超过了石墨的抗剪强度;三种焊接接头界面都有脆性组织出现,其分布受中间层的成分和形成的固溶体影响,而且脆性组织中存在大量微裂纹,是影响接头抗剪强度的因素之一。
Molybdenum and graphite were welded in vacuum at 1 650 ℃ for 1 h using Cr-Ni powders Cr-Ni-Cu thin sections,and Ti-Ni-Zr powders as the interlayer respectively by transient liquid phase diffusion bonding technology.The welding joints were sheared to analyze the microstructure and composition.The results show that molybdenum and graphite could be welded together and certain strength could be acquired with the three different interlayers.The greatest shear strength was got when the Ti-Ni-Zr powders were used as the interlayer,which was stronger than that of graphite.There was brittle microstructure in the welding joints interface,whose distribution was effected by composition of the interlayer and the solid solution.And there were a large number of micro-cracks existed in brittle microstructure,which was one of the factors affecting the shear strength.
出处
《机械工程材料》
CAS
CSCD
北大核心
2011年第2期20-23,共4页
Materials For Mechanical Engineering
关键词
瞬间液相扩散焊
钼
石墨
中间层合金
transient liquid phase diffusion bonding
molybdenum
graphite
interlayer alloy
