Gm Global Technolgoy Operations, Inc.

Alan P Druschitz

Edward F Ryntz, Jr

Robert M Ramage

Susan R Schuon

Alexander J Toth, Iii

The mold formed of resin-bonded sand includes a vertical sprue in fluid flow communication with a horizontal chamber reservoir underlying the mold cavity defining the thin wall structure. The thin wall cavity portion is positioned about a common horizontal level above the reservoir. Vertical runners feed the metal from the horizontal reservoir up into the cavity. The number and location of these runners are such as to fill the cavity from several points of entry with uniform temperature metal before any solidification occurs.

Mold for producing thin wall castings by gravity pouring

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.

Growing community of inventors

Rochester Hills, MI, United States of America

Alan P Druschitz