Cooking utensil with a hard and non-stick coating

Details Cooking utensil with a hard and non-stick coating Cooking utensil with a hard and non-stick coating

1994-06-02

1995-10-03

Nakarani, D. S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

99422, 99445, 126390, 428334, 428335, 428336, 428422, 428461, 428463, B32B 1508, B32B 2730

Patent

active

054551021

ABSTRACT:
A method for coating metal cookware includes (a) roughening and cleaning a cooking surface of the metal cookware's inner wall by spraying aluminum oxide of 60-80 mesh onto the inner wall surface; (b) applying a mechanically resistant layer onto the roughened and cleaned cooking surface of the metal cookware by electric-arc spraying at a temperature of 4500.degree.-8000.degree. C., under a pressure of 5-8 kg/cm.sup.2, and with a voltage of 30-40 V and a direct current of 100-300 A, the mechanically resistant layer being made of a metallic material, and (c) applying a lubricative layer, which consists essentially of PTFE (polytetrafluoroethylene), onto the mechanically resistant layer by spray coating until the lubricative layer has a thickness of about 23-36 .mu.m and whereby a pencil hardness of 8-9 H is achieved.

REFERENCES:
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patent: 4070525 (1978-01-01), Vassiliou et al.
patent: 4196256 (1980-04-01), Eddy et al.
patent: 4252859 (1981-02-01), Concannon et al.
patent: 4395445 (1983-07-01), Gebauer et al.
patent: 4568573 (1986-02-01), Sunada et al.
patent: 4683168 (1987-07-01), Hares et al.
patent: 4808490 (1989-02-01), Tsukuda et al.
patent: 4862609 (1989-09-01), Ulrich et al.

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