C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 19/03 (2006.01) C22C 19/07 (2006.01) C22F 1/10 (2006.01) C23C 14/14 (2006.01) C23C 16/06 (2006.01) C25D 3/56 (2006.01)
Patent
CA 2601993
A nickel based alloy coating and a method for applying the nickel based alloy as a coating to a substrate. The nickel based alloy comprises about 0.1-15% rhenium, about 5-55% of an element selected from the group consisting of cobalt, iron and combinations thereof, sulfur included as a microalloying addition in amounts from about 100 parts per million (ppm) to about 300 ppm, the balance nickel and incidental impurities. The nickel-based alloy of the present invention is applied to a substrate, usually an electro-mechanical device such as a MEMS, by well-known plating techniques. However, the plating bath must include sufficient sulfur to result in deposition of 100-300 ppm sulfur as a microalloyed element. The coated substrate is heat treated to develop a two phase microstructure in the coating. The microalloyed sulfur-containing nickel-based alloy of the present invention includes a second phase of sulfide precipitates across the grain (intragranular) that improves the stress-relaxation resistance of the alloy.
Chou George Jyh-Shann
Hilty Robert Daniel
Lawrence Valerie
Smart & Biggar
Tyco Electronics Corporation
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