Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1999-08-09
2000-10-24
Mai, Ngoclan
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
419 36, 419 64, 419 65, B22F 100
Patent
active
061362654
ABSTRACT:
A method of forming a coating on metal particles that can be used to produce powder metallurgy articles, including those for electromagnetic and structural applications. The method is generally a solution-blending process that employs a coating solution that contains a solvent and one or more particulate additives, at least one of which is a polymeric binder that is only partially soluble in the solvent. As a result, only a portion of each binder particle is dissolved in the solvent. Notably, the coating solution is free of a discrete adhesion-promoting (tackifier) additive for adhering the polymeric binder to the metal particles. Instead, each binder particle is sufficiently dissolved in the solvent to promote adhesion of the binder particles to the metal particles during mixing, so that each metal particle is encapsulated with a coating containing the polymeric binder. The particles may then be compacted to bind them together with the coating and form a solid article.
REFERENCES:
patent: 5069714 (1991-12-01), Gosselin
patent: 5432223 (1995-07-01), Champagne et al.
patent: 5472661 (1995-12-01), Gay
patent: 5567746 (1996-10-01), Gay
patent: 5595609 (1997-01-01), Gay
Delphi Technologies Inc.
Dobrowitsky Margaret A.
Mai Ngoclan
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