Coating processes – Coating by vapor – gas – or smoke – Base includes an inorganic compound containing silicon or...
Patent
1993-03-01
1995-04-18
Beck, Shrive
Coating processes
Coating by vapor, gas, or smoke
Base includes an inorganic compound containing silicon or...
4272552, 4272557, C23C 1606, C23C 1608
Patent
active
054077052
ABSTRACT:
A method and an apparatus for producing an adherent and oxidation-resistant aluminide region on the surface of a nickel- or cobalt-based superalloy article. A hypo-stoichiometric region of nickel or cobalt aluminide is produced by chemical vapor deposition on the surface of the article. Nickel or cobalt from the superalloy surface diffuses outward into the hypo-stoichiometric region, thus preventing migration of various refractory elements generally present in the superalloy, whose presence has a detrimental effect on the adhesion and oxidation resistance of a conventional aluminide region. A hyper-stoichiometric region of nickel or cobalt aluminide is then deposited by chemical vapor deposition on the hypo-stoichiometric region, to provide a sufficient supply of aluminum on the exposed surface of the article for forming a tough oxidation-resistant scale of alumina.
REFERENCES:
patent: 4350719 (1982-09-01), Baldi
patent: 4405660 (1983-09-01), Ulion et al.
patent: 4880614 (1989-11-01), Strangman et al.
Proceedings of Seventh International Conference on Chemical Vapor Deposition 1979; Brennfleck, K. et al. "Preparation of Hot Corrosion Resistant Aluminide Layers By CVD of Aluminum from its Subchloride" pp. 578-592.
Bunshah, R. F. ed., Deposition Technologies For Films And Coatings Noyes Publications, p. 122, 1982.
Beck Shrive
Chen Bret
General Electric Company
Pittman William H.
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