Method of producing protective coatings with chemical composition and structure gradient across the thickness
First Claim
1. In a method for producing a protective coating having a chemical composition and structure gradient across its thickness and a ceramic outer layer, the coating being formed on a substrate, the method including:
- heating the substrate in a vacuum;
heating a ceramic ingot in the vacuum with an electron beam to evaporate material from the ingot; and
condensing the material evaporated from the ingot on the heated substrate;
the improvement comprising;
applying a mixture of materials on the surface of the ingot which is to be impinged upon by the electron beam, the mixture comprising metals or alloys and oxides with different vapor pressures at the evaporation temperature of the ingot, whereby the mixture is electron beam heated, evaporated and condensed on the substrate prior to the evaporation of the material from the ceramic ingot.
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Abstract
The invention relates to the production of protective coatings for parts of gas turbines and internal combustion engines which are to be subjected to thermal loading. A coating formed in accordance with the invention has a chemical composition and structure gradient across its thickness and an outer ceramic layer. The coating is obtained by electron beam heating of a mixture of metals (alloys) and oxides which have different vapor pressures at the evaporation temperature, the mixture and an underlying ceramic ingot being serially evaporated and subsequently condensed on the part to be coated.
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Citations
20 Claims
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1. In a method for producing a protective coating having a chemical composition and structure gradient across its thickness and a ceramic outer layer, the coating being formed on a substrate, the method including:
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heating the substrate in a vacuum; heating a ceramic ingot in the vacuum with an electron beam to evaporate material from the ingot; and condensing the material evaporated from the ingot on the heated substrate; the improvement comprising; applying a mixture of materials on the surface of the ingot which is to be impinged upon by the electron beam, the mixture comprising metals or alloys and oxides with different vapor pressures at the evaporation temperature of the ingot, whereby the mixture is electron beam heated, evaporated and condensed on the substrate prior to the evaporation of the material from the ceramic ingot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification