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:
Nov. 23, 1993
Filed:
Sep. 11, 1991
Gregory N Colvin, Muskegon, MI (US);
Howmet Corporation, Greenwich, CT (US);
Abstract
A method of making a composite casting wherein a casting mold is provided for receiving a melt and a preformed metallic or intermetallic insert is positioned in the mold cavity. The preformed insert includes a working portion for incorporation in the casting and gas seal-forming means located at a region of the insert at least outboard of the insert portion. A melt is introduced into the mold about the insert and is then solidified to provide a composite casting having the insert working portion disposed in the solidified melt and as-cast gas seal regions located outboard of the insert working portion in the casting. The casting is then subjected to elevated temperature and isostatic gas pressure conditions wherein the as-cast gas seal regions are effective to inhibit gas penetration between the insert working portion and the solidified melt therearound so as to permit formation of a sound, void-free metallurgical bond therebetween. The hot isostatically pressed casting can then be trimmed to remove, if desired, those outboard portions containing the gas seal regions, leaving a finished casting having the insert working portion metallurgically bonded therein in a sound, void-free manner.