Coating processes – Spray coating utilizing flame or plasma heat – Metal or metal alloy coating
Patent
1996-10-07
1998-06-23
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Metal or metal alloy coating
427456, 427446, 427576, C23C 408
Patent
active
057702730
ABSTRACT:
A durable coating process which provides improved adhesive bond strength between the coating and its substrate. This process utilizes spray parameters which generate a unique plasma coating that can be applied through a liquid environment between the spray gun nozzle and the substrate to provide combined ion cleaning, etching and activation of the surface to be coated. The improved surface conditioning allows the creation of an exceptionally strong metallurgical bond at the interface between the splattered droplets of the coating material and the substrate. The improved plasma coating process utilizes a relatively short nozzle-to-work surface distance and is therefore suitable for use directly in a liquid such as water in order to keep the substrate from overheating, which may be more likely to occur if the coating were applied in a gas or vacuum environment. The resulting plasma coating is characterized by high values of adhesive bond strength which are attributable to the high-strength metallurgical bond formed between the coating and substrate.
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M.R. Jackson, "Production of Metallurgical Structures by Rapid Solidification Plasma Deposition", J. Metals, vol. 33, No. 11, pp. 23-27 (Nov. 1981).
E. Lugscheider et al., "Unterwasserplasmaspritzen--eine neue Verfahrensvariante", Schweissen & Schneiden, vol. 41, No. 10, pp. 547-550 (Oct. 1989).
Kim Young Jin
Lau Yuk-Chiu
Nelson, III Alfred Stanley
Offer Henry Peter
Bareford Katherine A.
Flaherty Dennis M.
General Electric Company
McGinness James E.
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