Platinum aluminide CVD coating method

Details Platinum aluminide CVD coating method Platinum aluminide CVD coating method

1994-10-28

1997-08-19

King, Roy V.

Coating processes

Coating by vapor, gas, or smoke

Metal coating

427142, 427250, 427252, 427405, 4274192, 4274191, C23C 1600

Patent

active

056586140

ABSTRACT:
A method of improving the oxidation resistance of a platinum modified aluminide coating formed on a nickel base superalloy substrate, comprises providing a platinum layer on the substrate, heating the substrate in a coating retort to a temperature of at least about 1000.degree. C., forming external of the coating retort a high purity coating gas comprising hydrogen and aluminum trichloride, and introducing the coating gas into the coating retort to contact the heated substrate to form an outwardly grown, single phase [(Ni,Pt)]Al] platinum modified aluminide coating having reduced concentration of at least one of a substrate substitutional alloying element and a surface active tramp element selected from at least one of B, P, and S in said coating as compared to a platinum modified aluminide coating formed at a lower temperature.

REFERENCES:
patent: 3486927 (1969-12-01), Gauje
patent: 3598638 (1971-08-01), Levine
patent: 3677789 (1972-07-01), Bungardt
patent: 3692554 (1972-09-01), Bungardt
patent: 4501776 (1985-02-01), Shankar
patent: 4962005 (1990-10-01), Alperine et al.
patent: 5254413 (1993-10-01), Maricocchi
Evaluation of Simple Aluminide and Platinum Modified Aluminide Coatings on High Pressure Turbine Blades After Factory Engine Testing; Engineering Materials Technology Lab.; GE Aircraft Engines, Cincinnati, OH; pp. 1-8; Conner, et al.
Evaluation of Simple Aluminide and Platinum Modified Aluminide Coatings on High Pressure Turbine Blades After Factory Engine Testing--Round II; Engineering Materials Technology Lab.; GE Aircraft Engines, Cincinnati, OH; pp. 1-11; Conner.
Platinum Modified Aluminides--Present Status pp. 1-10; Smith and Boone.
Ductile to Brittle Transition Temperature Behavior of Platinum Modified Coatings; Materials Science and Engineering; 88, 1987, pp. 227-231; Vogel.

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