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Lubricating system for thermal medium delivery parts in a gas turbine

United States Patent

July 23, 2002
View the Complete Patent at the US Patent & Trademark Office
Cooling steam delivery tubes extend axially along the outer rim of a gas turbine rotor for supplying cooling steam to and returning spent cooling steam from the turbine buckets. Because of the high friction forces at the interface of the tubes and supporting elements due to rotor rotation, a low coefficient of friction coating is provided at the interface of the tubes and support elements. On each surface, a first coating of a cobalt-based alloy is sprayed onto the surface at high temperature. A portion of the first coating is machined off to provide a smooth, hard surface. A second ceramic-based solid film lubricant is sprayed onto the first coating. By reducing the resistance to axial displacement of the tubes relative to the supporting elements due to thermal expansion, the service life of the tubes is substantially extended.
Mashey; Thomas Charles (Coxsackie, NY)
General Electric Company (Schenectady, NY)
09/ 769,749
January 26, 2001
The Government of the United States of America has rights in this invention pursuant to COOPERATIVE AGREEMENT NO. DE-FC21-95MC31176 awarded by the U.S. Department of Energy.