Bearing member having a wear resistant coating on its bearing face
AssigneeKoppers Company, Inc.
InventorJohn E. Cromwell
Life of this patent
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Abstract
A bearing member such as a piston ring for internal combustion engines having a wear resistant alloy coating applied to its wear surface by plasma spraying an aggregate mixture of particles thereon. The mixture is made by first alloying carbon, silicon, chromium, nickel, iron, and boron together to form intermetallic brazing and binding alloy particles and by alloying substantially 75% cobalt and 25% molybdenum to form cobalt-molybdenum alloy particles, for mixing with individual particles of pure molybdenum. These three different particles form the aggregate mixture to be sprayed on the bearing surface.
Claims11
A bearing member having a wear resistant coating applied to a wear surface thereon by plasma spraying a mixture of particles on said wear surface, said mixture comprising by weight:
- 15-40% intermetallic brazing and binding alloy particles,
- said particles consisting of:
- 0.18 - 0.48 parts carbon,
- 0.60 - 1.60 parts silicon,
- 2.58 - 6.88 parts chromium,
- 10.50 - 28.00 parts nickel,
- 0.60 - 1.60 parts iron, and
- 0.54 - 1.44 parts boron;
- 5-30% cobalt molybdenum alloy particles,
- said cobalt molybdenum alloy particles consisting substantially of 75% cobalt alloyed with 25% molybdenum;
- and
- 30 - 60% molybdenum particles.
A piston ring having a bearing face coated with a wear resistant alloy, said alloy obtained by plasma spraying a mixture of particles substantially comprising by weight:
- 35% intermetallic brazing and binding alloy particles,
- said particles consisting of:
- 0.4 parts carbon,
- 1.4 parts silicon,
- 6.0 parts chromium,
- 24.5 parts nickel,
- 1.4 parts iron, and
- 1.3 parts boron;
- 6.7% cobalt molybdenum alloy particles, of which 5 parts is cobalt and 1.7 parts is molybdenum;
- and
- 58.3% molybdenum particles.
Dependencies are inferred from the claim text.