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PRE-OXIDATION OF ENGINE VALVES AND SEAT INSERTS FOR IMPROVED LIFE

United States Patent Application

20120043490
A1
View the Complete Application at the US Patent & Trademark Office
A valve seat insert operable with a valve to selectively open and close a passage to a cylinder in an internal combustion engine. The valve seat insert includes a cobalt alloy base including at least about 40 wt % Co and at least about 5 wt % Cr. An oxide scale coating is disposed on at least a wear face of the valve seat insert adapted to engage the valve and optionally on a portion of the valve.
Kelsey, Eric (Hennepin, IL), Phillips, Nathaniel S. L. (Morton, IL), Jensen, Jeff A. (Dunlap, IL)
Caterpillar Inc. (Peoria IL)
12/ 859,563
August 19, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT [0001] This disclosure was made in part with Government support under CRADA NFE-07-00995 between Caterpillar Inc. and UT-Battelle, LLC under its Prime Contract with the U.S. Department of Energy for the operation of the Oak Ridge National Laboratory. The Government may have certain rights in this disclosure.