Metallurgical apparatus – Means for holding or supporting work – Receptacle
Patent
1990-09-20
1991-08-06
Andrews, Melvyn J.
Metallurgical apparatus
Means for holding or supporting work
Receptacle
266280, C21B 300
Patent
active
050370707
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.
REFERENCES:
patent: 4546052 (1985-10-01), Nicoll
"The Thermal Fatigue of Die-Casting Dies" by S. J. Noesen, et al., Transactions of the American Foundrymen's Society, vol. 75 (1967) pp. 133-146.
"Refractory Metals: New Keys to Austomated Casting of Ferrous Metals" by R. L. Barto, et al., Transactions of the American Foundrymen's Society, vol. 74, (1966), pp. 321-324.
"The Pressure Die Casting of Irons and Steels" by R. L. Barto, et al., Transactions of the American Foundrymen's Society, vol. 75 (1967), pp. 181-185.
"Die Casting of Stainless and Alloy Steels" by D. T. Hurd et al, Transactions of the American Foundrymen's Society, vol. 76 (1968), pp. 511-514.
"The Effect of Sulfur and Zirconium Co-Doping on the Oxidation of NiCrAl" (NASA Technical Memorandum 100209) by J. L. Smialek as prepared for the 172nd Meeting of the Electro-Chemical Society, Honolulu, Hawaii, Oct. 18-23, 1987, pp. 1-16.
Druschitz Alan P.
Schuon Susan R.
Andrews Melvyn J.
General Motors Corporation
Grove George A.
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