Precision casting and dead-mold casting in plastic/carbon aerogels
AssigneeDLR Deutsches Zentrum für Luft- und Raumfahrt e.V.
InventorsLorenz Ratke, Jochen Fricke
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Abstract
The present invention relates to a molding material for the precision casting and dead-mold casting of metals or metal alloys comprising plastic and/or carbon aerogels, and a process for the preparation of such molding materials. The molding material comprises highly porous open-cell plastic and/or carbon aerogels, obtainable by the sol-gel polymerization of organic plastic materials, optionally followed by partial or complete pyrolysis of the plastic aerogel obtained.
Claims12
A molding material for the precision casting and dead-mold casting of metals or metal alloys comprising highly porous open-cell plastic and/or carbon aerogels, obtainable by the sol-gel polymerization of organic plastic materials, optionally followed by partial or complete pyrolysis of the plastic aerogel obtained.
A process for the preparation of casting molds for the precision casting and dead-mold casting of metals or metal alloys using highly porous open-cell plastic and/or carbon aerogels, comprising the steps:
- a) wetting a wax mold with a plastic sol of an appropriate composition containing an appropriate catalyst;
- b) converting the sol to a gel at a temperature below the pour point of the wax;
- b′) optionally, applying one or more additional layers of the sol each of which is partially or completely converted to the gel form;
- c) drying the gel at a temperature below the pour point of the wax;
- and
- d) melting and draining or burning off the wax from the solidified gel at a temperature above the pour point of the wax.
A process for the preparation of casting molds for the precision casting and dead-mold casting of metals or metal alloys using highly porous open-cell plastic and/or carbon aerogels, comprising the steps:
- a) placing a wax molding in a container;
- b) filling the container partly or wholly with a plastic sol;
- c) converting the sol to the gel form at a temperature below the pour point of the wax;
- d) drying the gel at a temperature below the pour point of the wax;
- and
- e) melting and draining or burning off the wax from the solidified gel at a temperature above the pour point of the wax.
A mold for casting metal articles having a predetermined shape, said mold comprising highly porous open-cell plastic or carbon aerogel obtained by sol-gel polymerization of organic plastic material, optionally followed by partial or complete pyrolysis of the plastic aerogel obtained, wherein said open-cell plastic or carbon aerogel surrounds a cavity having said predetermined shape.
Dependencies are inferred from the claim text.