Slurry coating system
First Claim
1. A process for forming an oxidation and corrosion resistant coating on selected surfaces of an airfoil comprising:
- forming a dry chemical composition consisting essentially of from about 2.5 wt % to about 7.0 wt % aluminum fluoride, from about 5.0 wt % to about 20 wt % of a chromium-aluminum powder, and from about 75 wt % to about 92.5 wt % of Al2 O3 ;
mixing said dry chemical composition with a cellulose compound and water so as to form a slurry composition; and
placing said slurry composition into contact with internal surfaces of said airfoil.
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Abstract
The present invention relates to a composition for coating internal surfaces of an airfoil, particular high pressure temperature airfoils such as vanes and blades. The composition includes a dry composition consisting essentially of from about 2.5 wt % to about 7.0 wt % aluminum fluoride, from about 5.0 wt % to about 20 wt % of a chromium-aluminum powder, and from about 75 wt % to about 92.5 wt % Al2 O3. The dry composition is mixed with water and a cellulose compound to form a slurry which is thereafter injected into the airfoil. The coating compositions of the present invention are valuable in that they are capable of forming an oxidation and corrosion resistant coating on the internal surfaces of the airfoil simultaneously with the formation of an exterior corrosion and oxidation resistant coating. A process for simultaneously forming corrosion and oxidation resistant coatings on the interior and exterior surfaces of an airfoil is described herein.
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8 Claims
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1. A process for forming an oxidation and corrosion resistant coating on selected surfaces of an airfoil comprising:
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forming a dry chemical composition consisting essentially of from about 2.5 wt % to about 7.0 wt % aluminum fluoride, from about 5.0 wt % to about 20 wt % of a chromium-aluminum powder, and from about 75 wt % to about 92.5 wt % of Al2 O3 ; mixing said dry chemical composition with a cellulose compound and water so as to form a slurry composition; and placing said slurry composition into contact with internal surfaces of said airfoil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification