Patent ID: 6797335
Filing Date: 2004-09-28
Classification: C23C,Y10T

Abstract:
A method for depositing wear-resistant coatings on metal surfaces of machine components and articles to improve service life of parts and to reshape geometrical size of parts during repair, said method comprising the following steps:(i) providing an ion-plasma deposition chamber; (ii) locating as an anode said machine components or articles being treated inside said ion-plasma deposition chamber; (iii) locating in said chamber cathodes made from the Group IVB-VIB metals and/or alloys thereof; (iv) establishing in said chamber a gas atmosphere wherein the gas is selected from the group consisting of inert or non-inert gases and mixtures thereof; (v) effecting, whenever necessary, ion cleaning of surfaces of said machine components or articles; (vi) effecting selective ion-plasma deposition of at least three layers of a coating, wherein: at least one layer (a) consists of said metals, mixtures thereof or substitution alloys, said at least one layer having a thickness of 0.02-5 microns, a second layer (b) consists of interstitial solid solutions of nonmetallic atoms of nitrogen, carbon, and boron in said Group IVB-VIB metals, said second layer having a thickness of 0.4-10 microns, and a third layer (c) consists of chemical compounds of interstitial chases of said Group IVB-Group VIB metals with nonmetals in the form of nitrides, carbides, borides and mixtures thereof, said third layer having a thickness of 0.1-12.5 microns, wherein said first second and third layers have thickness ratios of about 1:2:2.5 respectively; (vii) subjecting one or more of said layers to treatments by implanting thereinto non-metallic ions simultaneously with the step of effecting ion-plasma deposition, said non metallic ions selected from the group consisting of argon, nitrogen, carbon or boron ions; and (viii) cooling and unloading said machine components or articles from said chamber.