US 3,936,295 A · Bearing members having coated wear surfaces

Abstract

The invention comprises bearing members having a coated wear surface applied by plasma-spraying an aggregate of particles thereon consisting of nickel-aluminum particles, nickel-molybdenum particles, tungsten carbide particles, and intermetallic alloy particles to form a high temperature, oxidation resistant, wear resistant, and scuff resistant coating. Alloying of the constituents in the final coating is desired and is achieved by encapsulating both the aluminum and molybdenum particles with nickel (alternatively the nickel-aluminum may be in the form of a bonded aggregate), by sintering the tungsten carbide in a matrix of cobalt, and by alloying nickel-cobalt, carbon, silicon, chromium, boron, and iron into an intermetallic alloy to form an aggregate of four types of particles for plasma-spraying onto the wear surface.

Claims10

Dependent claims

A powder mixture for plasma spraying onto a wear surface of a bearing member comprising by weight:

0 - 10.5% Ni-Al particles,
said Ni-Al particles consisting of
4.5 - 22% elemental aluminum and
78 - 95.5% elemental nickel;
26.7 - 85% Ni-Mo particles;
said Ni-Mo particles consisting of a core of
40 - 60% elemental molybdenum encapsulated in
60 - 40% elemental nickel;
15 - 39% sintered WC-Co particles,
said sintered particles consisting of a matrix of
10 - 14% elemental cobalt particles containing
86 - 90% tungsten carbide particles;
and
0 - 47.8% intermetallic alloy particles,
said alloy particles consisting of
63.9 - 77.6% nickel-cobalt alloy of which no more than 1% is cobalt,
0.6 - 1.3% carbon,
3.0 - 5.0% silicon,
13.0 - 20.0% chromium,
2.75 - 4.75% boron, and
3.0 - 5.0% iron.

18 more elements

Dependencies are inferred from the claim text.

Bearing members having coated wear surfaces

Life of this patent

Bearing members having coated wear surfaces

Life of this patent

Abstract

Claims10