# US 8,784,979 B2 · Thermally sprayed gastight protective layer for metal substrates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,979 B2 - Document ID: US8784979B2 - Status: Granted - Kind: B2 - Application number: 12/129,872 - Filed: 2008-05-30 - Published: 2008-12-25 - Granted: 2014-07-22 - Earliest claimed: 2007-06-19 - Assignees: Markisches Werk GmbH - Applicants: Vadim Verlotski - Inventors: Vadim Verlotski - Web page: https://patentgrep.com/patent/US8784979B2 ## CPC - C23C 4/067: containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic - C23C 4/10: Oxides, borides, carbides, nitrides or silicides; Mixtures thereof - C23C 4/11: Oxides - C23C 4/129: Flame spraying - C23C 4/134: Plasma spraying - Y10T 428/12611: Oxide-containing component - Y10T 428/12618: Plural oxides - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract In a thermally sprayed, gastight protective layer for metal substrates, such as Fe, Ni, Al, Mg and/or Ti, the spray powder for the purpose includes at least two components. The first is a silicate mineral or rock and the second is a metal powder and/or a further silicate mineral or rock. The silicate mineral or rock component in the spray powder has an alkali content of less than 6 percent by weight. ## Claims ### Claim 1 A thermally sprayed, gastight protective layer for a metal substrate; the substrate selected from one of Fe, Ni, Al, Mg or Ti, the protective layer comprising: a first and a second component, the first component comprising a first silicate, the second component comprising one of a first metal powder, a second silicate, and a combination of the first metal powder and the second silicate; wherein an alkali content of a combination of the first and second components in an initial spray powder is less than 6 percent by weight; and wherein the first and the second silicate are selected from a silicate mineral or a silicate rock. ### Claim 2 (depends on 1) A protective layer according to claim 1, wherein the first metal powder comprises a nickel-base or copper-base alloy. ### Claim 3 (depends on 1) A protective layer according to claim 1, wherein the first silicate or the second silicate comprise a natural or synthetically produced mineral or rock. ### Claim 4 (depends on 1) A protective layer according to claim 1, wherein the second component is the combination of the first metal powder and the second silicate. ### Claim 5 (depends on 1) A protective layer according to claim 1, wherein the protective layer comprises at least 10 percent by weight of the first silicate, second silicate or a combination of first and second silicates, wherein the purity of the first silicate or combination of first and second silicates in terms of SiO2 content is greater than 99 percent. ### Claim 6 (depends on 1) A protective layer according to claim 1, wherein the protective layer has a thermal conductivity of between 0.8 and 5 W/mK. ### Claim 7 (depends on 1) A protective layer according to claim 1, wherein the protective layer has a layer thickness of 100 to 2500 μm. ### Claim 8 (depends on 1) A protective layer according to claim 1, wherein the protective layer has a layer thickness of greater than 2 mm. ### Claim 9 A spray powder for producing a protective layer, the spray powder comprising: a first and a second component, the first component comprising a first silicate, the second component comprising one of a first metal powder, a second silicate, and a combination of the first metal powder and the second silicate; wherein an alkali content of a combination of the first and second components is less than 6 percent by weight; and wherein the first and the second silicate are selected from a silicate mineral or a silicate rock; wherein when sprayed a protective layer results over a substrate. ### Claim 10 A method of applying a protective layer, the protective layer comprising a first and a second component, the first component comprising a first silicate, the second component comprising one of a first metal powder, a second silicate, and a combination of the first metal powder and the second silicate; wherein an alkali content of a combination of the first and second components in an initial spray powder is less than 6 percent by weight; and wherein the first and the second silicate are selected from a silicate mineral or a silicate rock; the method comprising the step of: (a) applying the protective layer to a substrate to protect against high temperature, corrosion or erosion, the substrate comprising a surface of a combustion engine or a gas turbine. ### Claim 11 (depends on 10) The method of claim 10, wherein the first silicate or the second silicate comprise a natural or synthetically produced mineral or rock.