Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1993-01-15
1996-02-27
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 6, 419 24, 419 31, 419 34, 264DIG36, B22F 100
Patent
active
054946344
ABSTRACT:
Graphite or carbon particles with a graphitic skin are intercalated with a compound including an oxidized form of a metal and then reduced in a hydrogen atmosphere. This process reduces the driving force for the galvanic reaction between the particles and active metals in aqueous environments. The particles may be present as a reinforcement for a metal matrix (e.g., graphite/aluminum metal matrix composites) or as a reinforcement for a non-metallic material (e.g., graphite/polyimide, graphite/polyester or graphite/cyanate composites). In the latter case, the composite is adjacent to a metal in a structure.
By way of example, the graphite or carbon particle may be a fiber, the metal subject to attack may be aluminum or magnesium, and the intercalation compound may be NiCl.sub.2.
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Edelstein Alan S.
Everett Richard K.
Maruyama Benji
Trzaskoma Patricia P.
Chi Anthony R.
Edelberg Barry A.
McDonnell Thomas E.
The United States of America as represented by the Secretary of
Walsh Donald P.
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