Turbine Components Corporation

Sermatech International Inc.

Srinivasan Shankar

Bruce G McMordie

Thomas Kircher

George W Goward

G William Goward

Slurry coating compositions are provided for metal substrates, particularly nickel or cobalt-containing alloys, that enable inward-type diffusion aluminide coatings having a substantially uniform coating thickness to be formed thereon. Substantially uniform coating thicknesses are achieved independent of applied slurry composition thickness or application method. The slurry coating composition of the invention comprises a Cr&mdash;Al alloy containing about 50 wt % to about 80 wt % Cr in the alloy, LiF in an amount greater than or equal to 0.3 wt % of the Cr&mdash;Al alloy, an organic binder, and a solvent.

Slurry compositions for diffusion coatings

Slurry coating compositions are provided for metal substrates, particularly nickel or cobalt-containing alloys, that enable inward-type diffusion aluminide coatings having a substantially uniform coating thickness to be formed thereon. Substantially uniform coating thicknesses are achieved independent of applied slurry composition thickness or application method. The slurry coating composition of the invention comprises a Cr--Al alloy containing about 50 wt % to about 80 wt % Cr in the alloy, LiF in an amount greater than or equal to 0.3 wt % of the Cr--Al alloy, an organic binder, and a solvent.

A dimensional composition, a dimensionally restored alloy structure and a method of dimensionally restoring gas turbine and the like components that will be subsequently coated which includes low-pressure plasma spraying onto a damaged vane or other components, an alloy composition consisting essentially by weight of 1 to 4% aluminum, 0 to 1.5% hafnium and 0 to 20% nickel in the base composition of the cobalt alloy component, grinding to final dimension and diffusion coating. Tantalum is substituted for columbium where the base composition of the alloy contains columbium.

Composite alloy structures

Methods are provided for forming protective diffusion layers on nickel, cobalt and iron base alloy parts comprising the formation of a diffusion layer of platinum, chromium and aluminum on said surfaces either by deposition of platinum and gas phase chromizing followed by aluminizing or by gas phase chromizing and deposition of platinum followed by aluminizing, or by gas phase chromizing followed by aluminizing and deposition of platinum, said gas phase chromizing performed out of contact with a source of gaseous chromizing species at elevated temperature, said aluminizing performed either out of contact or in contact with a powder mixture at elevated temperature.

Methods of forming a protective diffusion layer on nickel, cobalt, and

Methods are provided for forming protective diffusion layers on nickel, cobalt and iron base alloy parts comprising the steps of depositing a coating of a platinum group metal on the surface of the part to be protected and forming a diffusion layer of platinum and aluminum on said surfaces by gas phase aluminizing said surfaces out of contact with a source of gaseous aluminizing species at elevated temperature.

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Branford, CT, United States of America

Srinivasan Shankar