Set up comprising an expendable pattern and a gas-permeable conf

Details Set up comprising an expendable pattern and a gas-permeable conf Set up comprising an expendable pattern and a gas-permeable conf

1990-10-05

1992-10-27

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501128, 501 94, 428614, 428621, 249 83, C04B 3565

Patent

active

051589176

ABSTRACT:
A method of producing shaped, self-supporting ceramic bodies includes preparing a mold by applying a permeable, conformable material to a shape-defining surface of an expendable pattern. The permeable, conformable material, when set or stable, provides a mold with a shaped surface which is defined by, and is therefore substantially congruent to, the shape-defining surface. Upon heating, the material of the expendable pattern combusts or volatilizes and thus establishes the shaped cavity mold. A molten parent metal is then vaporized with a vapor-phase oxidant in such a manner as to form a ceramic body which grows into the mold cavity, and is shaped by it. The ceramic body is recovered from the mold having a shaped surface replicating the shape-defining surface of the expandable pattern.

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"Oxidation of Molten Aluminum Alloys, Reaction with Refractories"--M. Drouzy and M. Richard--Mar., 1974 Fonderie, France No. 332 pp. 121-128.
"Refractories for Aluminum Alloy Melting Furnaces"--B. Clavaud and V. Jost--Sep., 1980--Lillian Brassinga (from French) Jan., 1985.

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