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US 4,694,882 AGranted
Method for making thixotropic materials
AssigneeThe Dow Chemical Company
InventorRobert S. Busk
Life of this patent
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Abstract
A process for producing a liquid-solid composition comprising heating a liquefiable material sufficiently to form a liquid phase with solid dendritic particles therein without completely liquefying the material and subjecting said liquid-solid material to a shearing action sufficient to break at least a portion of the dendritic structures. The process includes injection molding, forging or die casting the material produced by the process.
Claims11
A process for producing a liquid-solid metal alloy comprising:
- (a) feeding a metal alloy having a dendritic structure into the barrel of a screw extruder;
- (b) heating the metal alloy to a temperature above the alloy's solidus temperature and below the alloy's liquidus temperature;
- and
- (c) subjecting the heated metal to a shearing action provided primarily by rotating the screw, said shearing action being sufficient to break at least a portion of the dendritic structures of the metal alloy to form a liquid-solid metal alloy composition.
1 more element
A process for producing a liquid-solid metal alloy comprising:
- (a) heating a metal alloy having a dendritic structure to a temperature above the alloy's solidus temperature and below the alloy's liquidus temperature;
- and
- (b) subjecting the heated metal to the action of a rotating plate, said action being sufficient to break at least a portion of the dendritic structures of the metal to form a liquid-solid composition.
A process for producing a liquid-solid metal alloy comprising:
- (a) heating a metal alloy having a dendritic structure to a temperature above the alloy's solidus temperature and below the alloy's liquidus temperature;
- and
- (b) passing the heated metal through a torturous path extruder, thereby shearing the heated metal to break at least a portion of the dendritic structures of the metal to form a liquid-solid composition.
Dependencies are inferred from the claim text.