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:
Aug. 06, 1991
Filed:
Sep. 20, 1990
Alan P Druschitz, Rochester Hills, MI (US);
Susan R Schuon, Perry, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A melt containment apparatus for containing molten metals, such as iron and aluminum, is formed of a nickel-based intermetallic alloy composed predominantly of nickel and enough aluminum and chromium to produce predominantly an ordered L12 face-centered cubic phase. The melt containment apparatus has a wall with a melt contact surface which has been oxidized to bear a protective integral oxide coating composed predominantly of a first layer formed mainly of alumina immediately overlying the wall and a second layer overlying the first layer which is predominantly composed of a spinel material having a metal constituent taken from the group consisting of nickel, aluminum and chromium. The protective integral oxide coating includes two layers, a first layer formed mainly of alumina immediately adjacent the alloy and a second layer overlying the first layer, the first layer being between 0.5 and 3 microns thick and containing at least 95 weight percent alumina, while the second layer is at least 10 microns thick and is predominantly composed of an oxide characterized by a spinel lattice structure having a metal constituent selected from the group conisting of nickel, aluminum, and chromium.