Abstract
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 NaNO2 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 NaNO2.(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 CoCL2 or NiCL2 to the fluoride system flux, the spreadability was greatly improved, due to the deposition of Co or Ni from CoCL2 or NiCL2 on the surface of sintered alloy.
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