Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
2005-05-31
2008-10-28
Zimmerman, John J. (Department: 1794)
Stock material or miscellaneous articles
Composite
Of metal
C428S701000, C428S702000, C188S25100R, C188S25100R, C188S25100R
Reexamination Certificate
active
07442443
ABSTRACT:
Disclosed is a chromium-nickel stainless steel alloy article having an adherent, wear resistant coating of metallic oxides and a method of forming an adherent, wear resistant coating of metallic oxides on a chromium-nickel stainless steel alloy article. The coating desirably has a thickness of from about 25.4 to about 102 microns (1 mil to about 4 mils) and is formed by exposure of the article to an oxidizing atmosphere, preferably air, preferably during heat treatment of the article. Such articles are useful, inter alia, as torque drive inserts for a friction disk for a multi-disk brake or clutch assembly. The drive inserts can be formed of an alloy such as 17-4PH stainless steel alloy having an adherent coating of lubricious oxides formed during frictional contact. It is believed that these lubricious oxides will form also if the heat treated base alloy is subject to temperatures greater than 815.6° C. (1500° F.) for a sufficient time in an oxidizing atmosphere.
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Bianco Robert
Steele Leslie
Swank John P.
Austin Aaron
Brinks Hofer Gilson & Lione
Goodrich Corporation
Zimmerman John J.
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