Patent ID: 6461563
Filing Date: 2002-10-08
Classification: B21C,B22F,H01F,Y10T

Abstract:
A process for manufacturing a compound sintered article, comprising:providing a first mixture of powdered materials, said mixture having, after sintering, a first set of physical properties; providing a second mixture of powdered materials, said mixture having, after sintering, a second set of physical properties that are the same as said first set of physical properties with one, and only one, exception; adding lubricants and binders to said first and second mixtures to form first and second feedstocks such that the amount that said feedstocks will shrink after sintering differs one from the other by less than about 1%; using a first mold, compression molding the first feedstock to form a first green part; transferring said first green part to a second mold and then injecting into said second mold a quantity of the second feedstock sufficient to form a compound green part; removing all lubricants and binders from the compound green part to form a powder skeleton; and sintering the powder skeleton to form said compound sintered article.