Patent ID: 8550792

Claim:
A device configured for converting energy, the device comprising: a first surface; a second surface configured for moving with respect to said first surface during operation of the device; and a coating disposed on at least one of said first surface and said second surface, said coating including; a first layer of a ceramic alloy represented by the general formula AlMgB 14 —X; wherein X is present in an amount of from 0 to 70 parts by weight based on 100 parts by weight of said ceramic alloy and is a doping agent selected from the Group IV elements and borides and nitrides thereof; and a second layer disposed on said first layer and including: said ceramic alloy; and carbon present in an amount of from about 1 part by weight to 90 parts by weight based on 100 parts by weight of said second layer, and in a gradient concentration that increases with a distance from said first layer; and wherein said coating has a hardness of from 10 to 20 GPa; wherein said coating has a coefficient of friction of less than or equal to 0.12.