Method of coating a superalloy substrate, coating compositions,

Details Method of coating a superalloy substrate, coating compositions, Method of coating a superalloy substrate, coating compositions,

1980-07-21

1982-05-04

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

427 34, 427190, 428472, 428678, B32B 1520, B05D 110

Patent

active

043282857

ABSTRACT:
A method is provided for improving the corrosion resistance of superalloy substrates, such as gas turbine blades, by initially coating the superalloy with an intermediate bonding alloy, followed by plasma spraying the resulting treated surface with cerium oxide or a sprayable blend of cerium oxide and zirconium oxide. The resulting metal oxide-super alloy composite has been found to be resistant to vanadium and sulfur dioxide corrosion.

REFERENCES:
patent: 3223538 (1965-12-01), Weigert
patent: 4247249 (1981-01-01), Siemers
patent: 4248940 (1981-02-01), Goward et al.
McKee, D. W. et al., "Resistance of Thermal Barrier Ceramic Coatings to Salt Corrossion", Thin Solid Films, pp. 439-445, (1980).
Calcium Silicates: A New Class of Highly Regenerative Sorbents for Hot Gas Desulfurization, Yang et al., AlChE Journal, (vol. 25, No. 5), pp. 811-819, Sep. 1979.
Thermal Barrier Coatings: Burner Rig Hot Corrosion Test Results, Hodge et al., DOE/NASA/2593-78/3, NAS TM-79005, Oct. 1978.
Ceramic/Metallic Thermal Barrier Coatings for Gas Turbine Engines, Wilkins et al., Preprints of Papers for 8th International Thermal Spraying Conference, Miami Beach, Fla., USA, Sep. 27-Oct. 1, 1976, pp. 10-18.
Accelerated Oxidation by Vanadium Pentoxide, Fairman, Chemistry and Industry, Nov. 14, 1959.
The Residual Oil Ash Corrosion Problem, Slunder, Corrosion, vol. 15, No. 11, Nov. 1959.
Vanadium--A Bad Actor in Fuels, Norris, Reprint from Marine Engineering/Log, Apr. 1959.
Proceedings of the 1st Conference on Advanced Materials for Alternative Fuel Capable Directly Fired Heat Engines, Jul. 31-Aug. 3, 1979, Maine Maritime Academy, Castine, Me., McKee et al., Resistance of Thermal Barrier Ceramic Coatings to Hot Salt Corrosion, pp. 258-269.
High Temperature Coatings for Protecting Hot Components in Gas Turbine Engines, Restall, Metallurgia, Nov. 1979, pp. 676-685.

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