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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 silicat

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.

대표청구항 ▼

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 powd

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; andwherein the first and the second silicate are selected from a silicate mineral or a silicate rock. 2. A protective layer according to claim 1, wherein the first metal powder comprises a nickel-base or copper-base alloy. 3. A protective layer according to claim 1, wherein the first silicate or the second silicate comprise a natural or synthetically produced mineral or rock. 4. A protective layer according to claim 1, wherein the second component is the combination of the first metal powder and the second silicate. 5. 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. 6. A protective layer according to claim 1, wherein the protective layer has a thermal conductivity of between 0.8 and 5 W/mK. 7. A protective layer according to claim 1, wherein the protective layer has a layer thickness of 100 to 2500 μm. 8. A protective layer according to claim 1, wherein the protective layer has a layer thickness of greater than 2 mm. 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; andwherein 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. 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; andwherein 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. 11. The method of claim 10, wherein the first silicate or the second silicate comprise a natural or synthetically produced mineral or rock.