Howmet Corporation

Howmet Research Corporation

Vincent J Russo

Thomas P Slavin

Kenneth S Murphy

William C Basta

Dwayne A Braithwaite

Lloyd W Cannon

A mask is used in aluminizing of superalloy turbine component, such as a turbine blade, where a region exposed to relatively high operating temperature is aluminized to form a diffusion aluminide coating and another region exposed to relatively lower operating temperatures is masked to prevent aluminizing of the masked region while concurrently being enriched in Cr and/or retaining a pre-existing Cr-content from the superalloy chemistry itself or from a previous chromizing operation.

Maskant for use in aluminizing a turbine component

Method of forming different diffusion aluminide coatings on different surface regions of the same superalloy substrate involves positioning the substrate in a coating chamber having a aluminum-bearing coating gas flowing therein with a first substrate surface region enclosed in a masking enclosure having one or more coating gas entrance apertures communicating the interior of the enclosure to the coating gas in the coating chamber and with a second substrate surface region freely communicated to the coating gas in the coating chamber, and gas phase aluminizing the substrate by heating the substrate to an elevated coating temperature in the coating chamber having the coating gas therein to concurrently form an outwardly-grown diffusion aluminide coating on the first substrate surface region and to form an inwardly-grown, diffusion aluminide coating on the second substrate surface region of the same substrate.

Duplex gas phase coating

Method for forming on a superalloy or other metallic substrate a platinum graded, outward single phase diffusion aluminide coating on a surface of the substrate by depositing a layer comprising Pt on the substrate and then gas phase aluminizing the substrate in a coating chamber having a solid source of aluminum (e.g. aluminum alloy particulates) disposed therein close enough to the surface of the substrate to form at an elevated substrate coating temperature a diffusion aluminide coating having an inner diffusion zone and outer additive single (Ni,Pt)Al phase layer having a concentration of platinum that is relatively higher at an outermost coating region than at an innermost coating region adjacent the diffusion zone.

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Orange, CT, United States of America

Vincent J Russo