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Metal Working

Surface-coating-for-machine-elements-having-rubbing-surfaces

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Details

Inventors: Newman, Paul;
Assignee: Rolls-Royce (1971) Limited (EN)
Primary Examiner: Peters, Jr.; Joseph F.
Assistant Examiner: Church; Gene A.
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher

In a foil gas bearing or other similar machine element the relatively rigid shaft is coated with a glaze-forming oxide layer between 0.003 and 0.020 ins. thick, while the relatively thin foils are coated with a layer of a compound comprising cobalt and chromium carbide to a depth of up to 0.003 ins., the surface layer of which is oxidized to a depth of 0.0001 ins. to 0.0005 ins.

DETAILED DESCRIPTION I claim: 1.
A machine element comprising a relatively rigid component and a relatively flexible component adapted for relative rotation and wherein the relatively rigid component is provided with a surface layer of a glaze-forming oxide between 0.
003 ins.
and 0.
020 ins.
thick, and the relatively flexible component is provided with a surface layer of a glaze-forming oxide between 0.
0001 ins.
and 0.
0005 ins.
thick.
2.
A machine element according to claim 1 and wherein the oxide layer in the relatively rigid member is between 0.
003 ins.
and 0.
007 ins.
thick.
3.
A machine element according to claim 1 and wherein the glaze-forming oxide on the relatively rigid component is an oxide of Cobalt.
4.
A machine element according to claim 1 and wherein the glaze-forming oxide on the relatively rigid component is an oxide of Chromium.
5.
A machine element according to claim 1 and wherein the relatively flexible component is coated with a compound consisting of cobalt and chromium carbide, the surface layer of which is oxidized to provide the glaze-forming oxide layer.
6.
A machine element according to claim 5 and wherein said compound consists of 75% cobalt and 25% chromium carbide by volume.
7.
A machine element according to claim 1 and wherein the machine element is a foil gas bearing which comprises a relatively rigid shaft and a plurality of relatively flexible foils for supporting the shaft in operation on a cushion of air, wherein the shaft is provided with a surface layer of a glaze-forming oxide between 0.
003 ins.
and 0.
020 ins.
thick, and each foil is provided with a surface layer of a glaze-forming oxide between 0.
0001 ins.
and 0.
0005 ins.
thick.

Description:
The present invention relates to surface coatings for machine elements, of the kind in which there is relative rotation between a relatively rigid component and a relatively flexible component at high speed, for example foil gas bearings.
In the operation of foil gas bearings there is contact between the two components at start-up and run-down of the bearing, and there is also a possibility that under high loading there may also be contact between the components at high speed

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