The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 1987
Filed:
Feb. 02, 1987
Applicant:
Inventor:
Douglas J Harvey, Sterling Heights, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22C / ; B22D / ;
U.S. Cl.
CPC ...
164 34 ; 164 45 ; 164 551 ;
Abstract
Casting aluminum by a lost foam process is improved by treating the metal during pattern replacement with a halide salt flux to inhibit formation of oxide fold defects. A preferred flux comprises a mixture of alkaline metal chloride compounds and includes an aluminum fluoride salt, such as sodium aluminum fluoride. In a preferred embodiment, the flux is incorporated into a polystyrene pattern prior to embedding the pattern in a sand mold and becomes dispersed on a front of the cast metal as the front progressively decomposes the pattern.