Patent ID: 8129041
Filing Date: 2012-03-06
Classification: C23C,Y10T

Abstract:
1. An article comprising: a first surface and a second surface operatively associated with the first surface for contacting the first surface, wherein the first surface and the second surface each comprise materials selected from the group consisting of nickel, nickel alloys, nickel based superalloys, cobalt, cobalt-nickel alloys, steels, and combinations thereof; and a first protective coating on at least a portion of the first surface, the first protective coating comprising a first coating layer and a second coating layer, the first coating layer having a hardness ranging from about 1500 Vickers to about 3500 Vickers and comprising a first component and a second component, the first component comprising boron, titanium, or chromium and the second component comprising nitrogen or carbon, and the second coating layer having a hardness ranging from about 300 Vickers to about 1500 Vickers, wherein at least a portion of the first protective coating comes into contact with the second surface when the second surface comes into contact with the first surface.