Method of adding particulate additives to metal particles
AssigneeGeneral Motors Corporation
InventorDavid E. Gay
Life of this patent
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Abstract
Method of distributing and retaining insoluble additive particles uniformly throughout a mass of moldable metal particles. The additive particles are suspended in a solution of a polymeric binder and spray-coated onto the metal particles. When the solvent evaporates, the additives remain glued to the metal particles by the binder.
Claims7
A method of distributing and retaining a minority amount of insoluble additive particles having a first average particle size substantially uniformly throughout a mass of moldable metal particles having a second average particle size greater than said first average particle size comprising the steps of:
- suspending a plurality of said metal particles in a stream of gas;
- spraying a slurry of said additive particles into said stream so as to coat the surfaces of each of said metal particles with said slurry, said slurry comprising said additive particles suspended in a solution of a polymeric binder and a solvent for said binder;
- and
- evaporating said solvent from said coated metal particles so as to precipitate said binder, and entrap said additive particles in said binder on said surfaces.
Dependencies are inferred from the claim text.