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Studies on Brazability of Electric Contact Chip Materials (Report I) : Effect of Surface Preparation of Sintered Tungsten Alloys on Wetting of BAg Filler Metals

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Abstract

Effect of surface preparation of sintered tungsten alloys on wetting of BAg alloys was studied. The etching treatment with molten NaNO_2 improved greatly the spreadability of filler alloys by making the surface rich in silver or copper due to the selective corrosion of tungsten in sintered alloys. Moreover, the better spreadability was gained by adding nickel or cobalt to filler alloys or sintered alloys. Then, the spread of filler alloys on sintered tungsten alloys was increased greatly due to nickel or cobalt coated on the surface of sintered alloys, when a flux containing NiCl_2 or CoCl_2 was used.

Journal

Details

  • CRID
    1570854177301973248
  • NII Article ID
    110006484595
  • NII Book ID
    AA00867058
  • ISSN
    03874508
  • Text Lang
    en
  • Data Source
    • CiNii Articles

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