US4004042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for applying a wear and impact resistant coating
Assignee: Sirius Corp
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Filing: 1975-03-07
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Granted: 1977-01-18
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Expires: 1995-03-07
Abstract
Abstract A base metal is coated with a wear and impact resistant material comprising a mixture of tungsten carbide powder and nickel chrome boron powder which is spray applied by means of a stream of energy. This coating is thereafter covered by a thin layer of nitrogen-carried boric acid or boric oxide powder, forming a glossy protective film prior to fusing of the entire coating at elevated temperature.
Inventors
- 👤 Thomas E. Fairbairn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:11
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
The improved method of applying a wear and impact resistant coating to a base material comprising the steps of: electrically generating a stream of energy having the capability of heating the base material and the coating mixture sufficiently to create a bond therebetween; introducing into said stream a mixture of tungsten carbide and a lower melting point matrix-forming material, both in powdered form; applying said mixture containing stream to the base material to create a coating thereon; applying by means of said stream, immediately after application of said mixture and without withdrawal of said stream, an additional oxidation-preventing coating prior to fusing; and thereafter fusing said coatings to the base material at an elevated temperature.
Claim 2
Dependent Claim
115 words
The improved method of applying a wear and impact resistant coating to a base material comprising the steps of: electrically generating a stream of energy having the capability of heating the base material and the coating mixture sufficiently to create a bond therebetween; introducing into said stream a mixture of tungsten carbide and a lower melting point matrix-forming material, both in powdered form; applying said mixture containing stream to the base material to create a coating thereon; applying by means of said stream, immediately after application of said mixture and without withdrawal of said stream, an additional oxidation-preventing coating prior to fusing; and thereafter fusing said coatings to the base material at an elevated temperature.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein said final fusing is obtained by application of said stream of energy to the coated base material to heat the surface to approximately 4,500° F. for up to 30 seconds.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said matrix-forming material is nickel-chrome-boron.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein said matrix-forming material is nickel-aluminum.
Claim 6
Dependent Claim
27 words
The method of claim 1 and including the preliminary step of softening the base material by heat prior to introducing said mixture into said stream of energy.
Claim 7
Dependent Claim
27 words
The method of claim 1 and including the steps of roughening and cleaning the base material prior to applying said mixture containing stream to said base material.
Claim 8
Dependent Claim
42 words
The method of claim 1 wherein said final fusing includes the steps of application of said stream of energy to the coated base material to heat the surface to approximately 950° F. and then quenching the coated base material in cold water.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said stream of energy is a plasma flame.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein said stream of energy is an energy beam.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein said stream of energy is a combined laser-energy beam.
Claim 12
Dependent Claim
29 words
The method of claim 1 wherein said additional oxidation preventing coating is selected from the group consisting of: boric acid, boric oxide, sodium tetraborate anhydride, and sodium tetraborate decahydrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |