Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Elemental metal or boron – or alloyed metal
Patent
1994-12-09
1997-09-02
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Elemental metal or boron, or alloyed metal
75246, 75255, B22F 100, C10M10304
Patent
active
056631243
ABSTRACT:
An iron or copper based metal powder useful for plasma deposition of a coating that has a dry coefficient of friction 0.75 or less and readily conducts heat through the coating. The powder comprises (a) H.sub.2 O atomized and annealed particles consisting essentially of (by weight) carbon 0.15-85%, oxygen 0.1-0.45%, an air hardening agent selected from manganese and nickel of 0.1-6.5%, and the remainder iron or copper, with at least 90% of the particles having oxygen and iron or copper combined in the lowest atomic oxygen form for an oxide of such metal.
A method of making anti-friction iron powder that is economical, selectively produces FeO and promotes fine flowable particles. The method comprises (a) steam atomization of a molten steel that excludes other oxygen, the steel containing carbon up to 0.4% by weight to produce a collection of comminuted particles, and (b) annealing the particles in an air atmosphere for a period of time of 0.25-2.0 hours in a temperature range of 800.degree.-1400.degree. F. to reduce carbon in the particles to about 0.2% or sponge iron by reducing Fe.sub.3 O.sub.4 or Fe.sub.2 O.sub.3 in CO and (H.sub.2 O steam) to attain nearly all iron with nearly all FeO and 0.1.degree. to 0.85.degree. C.
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Fucinari Carlo Alberto
Nageswar Rao V. Durga
Rose Robert Alan
Yeager David Alan
Ford Global Technologies Inc.
Howard Jacqueline V.
Malleck Joseph W.
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