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Method of Sealing Castings for the Prevention of Particulate Contamination

IP.com Disclosure Number: IPCOM000052597D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Blue, JE: AUTHOR [+4]

Abstract

Products or assemblies using castings frequently cannot tolerate partic contamination. The casting may be a source of such contamination as a result of entrapped casting residuals or machining fluids and compounds. These contaminants may impair adhesion of subsequent coatings or may induce malfunction of precision devices.

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Method of Sealing Castings for the Prevention of Particulate Contamination

Products or assemblies using castings frequently cannot tolerate partic contamination. The casting may be a source of such contamination as a result of entrapped casting residuals or machining fluids and compounds. These contaminants may impair adhesion of subsequent coatings or may induce malfunction of precision devices.

The particulate contamination may be eliminated by impregnation of the casting with anaerobic polymers that cure in the interconnecting porous channels that are inherent in the casting process. The sealing is done subsequent to casting but prior to machining operations. The polymer will fill the pores that are open to the surface of the casting and insure that contaminants introduced during casting are sealed in and that machining fluids are sealed out. Excess polymer is removed by cleaning in 1, 1, 1- trichloroethane or trichlorethylene.

In addition to sealing the casting surface, the polymer impregnation may afford enhanced machinability by acting as a lubricant during machining operations and provide improved adhesion of protective coatings applied to the casting, thus preventing further contamination.

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