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<p>Brazing of molybdenum to tungsten and to graphite has been achieved using Cu78Ti22 filler at 930 ℃. The brazing regions of both joints are mainly composed of Cu(ss) (solid solution), Ti-Cu intermetallics, Ti(ss), and Mo. The diffusion and dissolution of Mo element from the molybdenum substrate to the brazing region occur during the joining process for both joints. For the molybdenum/tungsten joint, the absorption of Ti on the tungsten side may promote interfacial bonding between the brazing region and the tungsten substrate. For the molybdenum/graphite joint, the active Ti in the filler can react with the graphite to develop a reaction layer of TiC at the brazing region/graphite interface, contributing to the interfacial bonding between the brazing region and the graphite. The fracture of the molybdenum/tungsten joint after the shear test occurs at the brazing region/tungsten interface, which is attributed to its relatively weak interfacial bonding. The molybdenum/graphite joint breaks on the graphite side, mainly caused by the large residual stress in the joint.</p>

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Dissimilar joining of molybdenum to tungsten and graphite using Cu78Ti22 filler

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Longkun Huang,
  • Siyu Miao,
  • Yingjie Zeng,
  • Yuqi Cai,
  • Julfikar Haider,
  • Yangwu Mao

摘要

Brazing of molybdenum to tungsten and to graphite has been achieved using Cu78Ti22 filler at 930 ℃. The brazing regions of both joints are mainly composed of Cu(ss) (solid solution), Ti-Cu intermetallics, Ti(ss), and Mo. The diffusion and dissolution of Mo element from the molybdenum substrate to the brazing region occur during the joining process for both joints. For the molybdenum/tungsten joint, the absorption of Ti on the tungsten side may promote interfacial bonding between the brazing region and the tungsten substrate. For the molybdenum/graphite joint, the active Ti in the filler can react with the graphite to develop a reaction layer of TiC at the brazing region/graphite interface, contributing to the interfacial bonding between the brazing region and the graphite. The fracture of the molybdenum/tungsten joint after the shear test occurs at the brazing region/tungsten interface, which is attributed to its relatively weak interfacial bonding. The molybdenum/graphite joint breaks on the graphite side, mainly caused by the large residual stress in the joint.