# US 10,370,613 B2 · Grey cast iron-doped diamond-like carbon coatings and methods for depositing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,613 B2 - Document ID: US10370613B2 - Status: Granted - Kind: B2 - Application number: 14/922,099 - Filed: 2015-10-23 - Published: 2016-04-28 - Granted: 2019-08-06 - Earliest claimed: 2014-10-24 - Applicants: Parag Gupta - Inventors: Parag Gupta - Web page: https://patentgrep.com/patent/US10370613B2 ## CPC - C10M 103/02: Carbon; Graphite - C23C 14/06: characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence) - C23C 14/0605: {Carbon} - C23C 14/3414: {Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy} - C10M 2201/04: Elements - C10M 2201/0413: used as base material - C10M 2201/05: Metals; Alloys - C10M 2205/028: containing aliphatic monomers having more than four carbon atoms - C10M 2219/068: Thiocarbamate metal salts - C10M 2223/045: Metal containing thio derivatives - C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure - C10N 2050/025: {in the form of films or sheets} - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract The disclosure provides grey cast iron-doped diamond-like carbon coating compositions useful for reducing friction and wear in mechanical contact surfaces and methods for deposition of such compositions. ## Claims ### Claim 1 An article comprising a coating composition disposed adjacent a substrate, the substrate comprising a steel alloy or an Si surface and the coating composition comprising diamond-like carbon (DLC); wherein the coating composition is produced by sputtering a composite target onto the substrate in the presence of a reactive gas; the composite target comprises graphite and a GCI alloy; and the GCI alloy comprises carbon in a range of about 1 at. % to about 6 at. % and silicon in a range of about 0.5 at. % to about 4 at. %. ### Claim 2 (depends on 1) The article of claim 1, wherein the GCI alloy comprises carbon in a range of about 2.5 at. % to about 4 at. % and silicon in an amount of about 1 at. % to about 3 at. %. ### Claim 3 (depends on 1) The article of claim 1, wherein the GCI alloy comprises carbon in an amount of about 3.6 at. % and silicon in an amount of about 2.6 at. %. ### Claim 4 (depends on 1) The article of claim 1, wherein the total Fe content in the coating composition is present in an amount of about 0.1 at. % to about 49.9 at. %. ### Claim 5 (depends on 1) The article of claim 1, wherein the total Fe content in the coating composition is present in an amount of about 0.1 at. % to about 35 w.t %. ### Claim 6 (depends on 1) The article of claim 1, wherein the total Fe content in the coating composition is present in an amount of about 12 at. % to about 35 at. %. ### Claim 7 (depends on 1) The article of claim 1, wherein the total Fe content in the coating composition is present in an amount of about 0.1 at. % to about 1.8 at. %. ### Claim 8 (depends on 1) The article of claim 1, wherein the DLC is hydrogenated. ### Claim 9 (depends on 1) The article of claim 1, wherein the substrate comprises an Si surface. ### Claim 10 (depends on 1) The article of claim 1, wherein the substrate comprises a steel alloy. ### Claim 11 (depends on 1) The article of claim 1, wherein the substrate further comprises a bonding interlayer, wherein the coating composition is deposited on the bonding interlayer of the substrate. ### Claim 12 (depends on 11) The article of claim 11, wherein the bonding interlayer is Ti. ### Claim 13 (depends on 1) The article of claim 1, wherein the reactive gas is acetylene. ### Claim 14 (depends on 1) The article of claim 1, wherein the GCI alloy and graphite are concentrated in sectors and organized on the target such that the concentration of Fe in the sputtered DLC coating varies across the substrate. ### Claim 15 (depends on 1) The article of claim 1, wherein the sputtering is magnetron sputtering. ### Claim 16 A method of forming a diamond-like carbon (DLC) coating, comprising sputtering a composite target onto a substrate in the presence of a reactive gas, wherein the composite target comprises graphite and a GCI alloy, wherein the GCI alloy comprises carbon in a range of about 1 at. % to about 6 at. % and silicon in a range of about 0.5 at. % to about 4 at. % wherein the substrate comprises a steel alloy or an Si surface. ### Claim 17 (depends on 16) The method of claim 16, wherein the reactive gas is acetylene. ### Claim 18 (depends on 16) The method of claim 16, further comprising sputtering a bonding interlayer onto the substrate before sputtering the composite target. ### Claim 19 (depends on 18) The method of claim 18, wherein the bonding interlayer is Ti. ### Claim 20 (depends on 16) The method of claim 16, wherein the sputtering is magnetron sputtering.