接点材料の銀ろう付性に関する研究(第 1 報) : 表面処理による含タングステン焼結合金上のろうのぬれ性について

概要

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Surface preparation of tungsten base sintered alloys (Ag-W, Cu-W alloy) was studied to improve the wetting of BAg filler metals. Several interesting results were obtained as follows. (1) The etching treatment of Ag-W or Cu-W sintered alloy in molten NaNO_2 made the surface rich with silver or copper by selective dissolution of tungsten. The improvement of spreadability of BAg filler metals on Ag-W or Cu-W sintered alloy was gained by means of the etching treatment in molten NaNO_2. (2) The addition of nickel metal to silver filler metal or to sintered alloys improved the spreadability a little with similar effect to the etcing treatment. (3) By the addition of CoCL_2 or NiCL_2 to the fluoride system flux, the spreadability was greatly improved, due to the deposition of Co or Ni from CoCL_2 or NiCL_2 on the surface of sintered alloy.
社団法人溶接学会の論文
1977-12-05