Coating processes – Spray coating utilizing flame or plasma heat – Metal oxide containing coating
Patent
1998-04-13
2000-08-15
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Metal oxide containing coating
427453, 427535, 427539, C23C 418
Patent
active
061033154
ABSTRACT:
A method for providing a substantially-smooth protective coating on a metal-based substrate is disclosed. A thermal barrier coating is first applied over the substrate by plasma-spraying. The coating is then plasma-heated according to a time- and temperature schedule sufficient to re-melt its surface region, allowing the coating material to flow and smoothen. The surface region is then allowed to cool to a temperature below its melting point. After being cooled, the surface is much smoother than when originally applied, which allows the coating to be used in a higher-temperature environment. The coating is often zirconia-based, e.g., yttria-stabilized zirconia.
REFERENCES:
patent: 5455079 (1995-10-01), Oden et al.
"Characterization of Laser Glazed Plasma Sprayed Yttria Stabilized Zirconia Coatings", by H.L. Tsai, P.C. Tsai & D.C. Tu, Materials Science and Engineering, A161 (1993) 145-155. (no month date).
"Laser Surface Sealing and Strengthening of Zirconia Coatings", by A. Petitbon, L. Boquet & D. Delsart, Surface and Coatings Technology, 49 (1991) 57-61 (no month date).
Bethel Timothy Francis
Borom Marcus Preston
Gray Dennis Michael
Hasz Wayne Charles
Johnson Curtis Alan
Bareford Katherine A.
General Electric Co.
Johnson Noreen C.
Stoner Douglas E.
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