Process for applying high application-temperature coating to hea

Coating processes – With pretreatment of the base – Heating or drying pretreatment

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Details

427195, 427318, 427386, 4273881, 4273882, D05D 302

Patent

active

H00018880

ABSTRACT:
A process is provided for coating a given surface of a heat sensitive metal article (e.g., thermally massive aluminum) with a high-cure-temperatureating-forming-powder. A first oven heating step elevates the metal article's temperature to a predetermined preheat cycle high-limit-of-heat-load-temperature. After a first predetermined period of time, the metal alloy article is withdrawn from the oven. A high-cure-temperature-coating-forming-powder is then sprayed onto the given surface of the metal article. The spraying, comprising first and second spray sequences, is initiated essentially immediately after withdrawal of the metal article from the oven. The first spray sequence is a single group of spray passes that applies a coating layer to fill the pores in the given surface with heat melted high-cure-temperature-coating-forming-powder. The second spray sequence builds up the total thickness of coating. A second oven heating step elevates the metal article's temperature to a predetermined cure cycle high-limit-of-heat-load-temperature for a second predetermined period of time.

REFERENCES:
patent: 4048355 (1977-09-01), Sakayori et al.
patent: 4104416 (1978-08-01), Parthasarathy et al.
patent: 4481239 (1984-11-01), Eckner
patent: 4685985 (1987-08-01), Stueke
patent: 4865882 (1989-09-01), Okano et al.

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