Coating processes – Spray coating utilizing flame or plasma heat – Metal or metal alloy coating
Patent
1998-07-29
2000-12-19
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Metal or metal alloy coating
427543, 427455, 427453, 427427, C23C 408, C23C 418, B05D 302
Patent
active
061625094
ABSTRACT:
A self-fusing alloy thermal spray coating or a vitreous ceramic coating is fused to a complicated metal shape or convoluted metal surface, such as a waterwall panel having a plurality of tubes interconnected by a plurality of membranes, without significant warpage or adverse change in the microstructure of the material forming the panel. The coating is first applied to the panel and then is heated to a liquidus temperature (typically between about 1000.degree.-2200.degree. F.), by induction at a frequency of greater than about 25 kHz, so as to effect fusing. An inductive coil assembly for this purpose comprises a copper tubular combined electrical current conductor and conduit for circulating cooling water having a first closed end and a second end connectable to a source of cooling fluid and a source of electricity. At least one, and preferably a plurality, of copper noses extend outwardly from the combined conductor and conduit and both conduct electricity and circulate cooling fluid. The noses extend substantially perpendicularly to the combined conductor and conduit and are configured so as to effect proper induction heating of the panel. A magnetic flux concentrator is preferably provided over at least some of the noses. Preheating noses (e.g. solid copper blocks) may be connected to a leading portion of the combined conductor and conduit.
REFERENCES:
patent: 4024617 (1977-05-01), McCormick
patent: 5128172 (1992-07-01), Whittick
"The Induction Fusion of Sprayed Self-Fluxing Alloys"; Eisenhardt et al; paper 49, 9th International Thermal Spraying Conference, May, 1980.
"Interface Morphology of Iron-Base Sulffusing Alloy Coating with Induction-Refusing"; Junling et al; Proceedings of ITSC 95, Kobe, May, 1995, pp. 537 through 541.
"Application of Self-Fused Alloy Coating by HF Induction Heating", Matsubara et al; Proceedings of ITSC 95, Kobe, May, 1995, pp. 1001-1004.
Cherico Stephen D.
Nemkov Valentin S.
Zhu Naiping D.
Bareford Katherine A.
Fosbel International Limited
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