ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The surface compositions of three different back-side metals: Ti/Ni/Au 0.1/0.4/0.1 μm, Ti/Ni/Ag 0.1/0.4/0.1 and 0.1/0.4/2 μm and Ti/Ni 0.1/04 μm after thermal treatment at 180°C in air were investigated by means of XPS technique. In the Ti/Ni/Au metal the Ni diffusion through the Au layer was observed, while in the Ti/Ni/Ag metal Ni was not found on the silver surface. Ti/Ni/Ag was found to be sensitive to contamination from elements such as sulphur and chlorine found on the silver surface after thermal treatment, while Ti/Ni metal is sensitive to oxidation. NiO, Ni(OH)2, NiOOH and Ni2O3 species were found on the Ni as deposited surface. The surface compositions were correlated to their wetting property using the Pb88—Sn10—Ag2 and Pb95.5—Sn2—Ag2.5 wt.% soft solder alloys. The wetting was studied measuring the contact angle between the surface and the drop of molten solders.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740220177
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