METAL ENCAPSULATED SOLID LUBRICANT COATING SYSTEM

摘要

The invention is directed to a thermally sprayable powder having grains comprising: a core of solid lubricant particles comprised of at least graphite and MoS2 (others may include Bn, NaF, LiF, CaF2, and WS2); and a thin, soft metal shell (Ni, Co, Fe, Zn, Sn, Mg, or Cu) encapsulating such core. Some core particles may also be hard, wear-resistant particles from the group consisting of SiC, NiCrAl, FeMn, FeCrAl, FeWNiVCr, NiCrMoVW, FeCrMoWV, CoFeNiCrMoWV, NiCrMoV, and CoMoCrVW. The invention also discloses a solid lubricant coating system for a metal wear interface subject to high temperatures and wet lubrication, comprising: (a) particles of an oil-attracting solid lubricant mixture having at least graphite and MoS2, (b) soft metal shells encapsulating the particles and being fused together to form a network of grains constituting a coating fusably adhered to the metal interface, the coating having a porosity of about 2-10 % by volume. Further, the invention discloses a method of making an anti-friction coating on metal surfaces such as cylinder bore walls of an engine.