Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1992-08-03
1995-03-28
Walsh, Donald P.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75235, 75236, 75238, 75246, 75252, 75254, C22C 2912
Patent
active
054012929
ABSTRACT:
A carbonyl iron powder (CIP) premix composition suitable for metal injection molding is provided herein. The composition comprises (a) CIP having a particle size in the range of about 0.2-7 microns, preferably about 0.2-5 microns, and a narrow particle size distribution; and (b) an alloying material, having a particle size in the range of about 0.02 to 5 microns, preferably about 0.03 to 3.0 microns, and a narrow particle size distribution, comparable to the CIP, and present in an amount of about 0.1-60% by weight of the composition, preferably 0.5-50%. The alloy material substantially covers the surface of the iron particles and is adhered thereto by attractive forces. Preferably the alloy material includes elemental metal powders which are smaller in particle size than the CIP.
The premix composition is prepared by intensive mixing of its powder components, e.g. by attritor milling at high speeds for an extended period of time, which reduces the particle size distributions of the powders and avoids alloy segregation during sintering.
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ISP Investments Inc.
Katz Walter
Mai Ngoclan T.
Maue Marilyn J.
Walsh Donald P.
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