Patent ID: 8273466
Filing Date: 2012-09-25
Classification: C23C,C25D,Y10T

Abstract:
1. A multi-layered composite coating for a substrate, comprising: a first layer of a first phosphorus electro-less nickel alloy on top of the surface of said substrate, said first layer comprising 9.5-13% phosphorus (w/w) and being 0.3-1.2 mil in thickness; a second layer of electrolytic nickel metal having a stress level below 7,000 psi compressive (−ve) or tensile (+ve) stress, wherein said second layer is on top of said first layer, and being 0.2-0.8 mil in thickness; a third layer of phosphorus electro-less nickel alloy on top of said second layer and having 9.5-13% phosphorus (w/w) and being 0.3-1.2 mil in thickness; a fourth layer comprised of one of: Ni—W-B, and Ni—Co—W, on top of said third layer and being 0.05-0.25 mil in thickness; a fifth layer comprised of a nickel/polytetrafluoroethylene composite on top of said fourth layer and being 0.2-0.5 mil in thickness; and a sixth layer of a sealing material on top of said fifth layer.