US3864164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for depositing protective coatings on carbon articles
Assignee: British Steel Corp
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Filing: 1972-10-20
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Granted: 1975-02-04
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Expires: 1992-10-20
Abstract
Abstract The invention relates to a method and apparatus for coating carbon articles, such as carbon electrodes for use in steelmaking, with aluminium and refractory materials. The method comprises in a single operation, spraying aluminium in a molten state on to the surface, and immediately spraying refractory material on to the aluminium coating so formed. The apparatus includes spray heads, by which the aluminium and refractory materials are sprayed, the spray heads being located alongside each other and moved relatively to the carbon electrode simultaneously, the distance apart of the spray heads being sufficient to ensure that there is virtually no interference between the sprays of aluminium and refractory material, and also to ensure that the heat of the molten aluminium does not dry out the refractory material before it reaches the surface of the carbon article.
Inventors
- 👤 Alan Hinchcliffe
- 👤 Kenneth Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:23
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/224; B05B13/00; B05B13/02; B05B13/0278; B05B13/04; B05B13/0442; C; C23; C23C; C23C4/00; C23C4/04; C23C4/12; C23C4/14; C23C4/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A METHOD OF CREATING A PROTECTIVE COATING ON THE SURFACE OF A CARBON ARTICLE COMPRISING, IN A SINGLE OPERATION, DIRECTING A SPRAY OF ALUMINIUM IN MOLTEN STATE AGAINST SAID SURFACE, AND IMMEDIATELY THEREAFTER DIRECTING A SPRAY OF A WATER-SLURRY OF REFRACTORY MATERIAL ONTO THE ALUMINIUM COATING SO FORMED WITHOUT DRYING OUT SAID SLURRY BEFORE IT REACHES THE SURFACE OF SAID CARBON ARTICLE, THERE BEING SUBSTANTIALLY NO INTERFERENCE BETWEEN THE SPRAYS.
Claim 2
Independent Claim
70 words
A METHOD OF CREATING A PROTECTIVE COATING ON THE SURFACE OF A CARBON ARTICLE COMPRISING, IN A SINGLE OPERATION, DIRECTING A SPRAY OF ALUMINIUM IN MOLTEN STATE AGAINST SAID SURFACE, AND IMMEDIATELY THEREAFTER DIRECTING A SPRAY OF A WATER-SLURRY OF REFRACTORY MATERIAL ONTO THE ALUMINIUM COATING SO FORMED WITHOUT DRYING OUT SAID SLURRY BEFORE IT REACHES THE SURFACE OF SAID CARBON ARTICLE, THERE BEING SUBSTANTIALLY NO INTERFERENCE BETWEEN THE SPRAYS.
Claim 3
Dependent Claim
24 words
A method according to claim 1 in which the carbon article is an electrode suitable for use in producing steel in an electric furnace.
Claim 4
Dependent Claim
28 words
A method as set forth in claim 1 including moving the sprays of aluminium and refractory slurry longitudinally of said carbon article while said carbon article is rotateD.
Claim 5
Dependent Claim
32 words
A method according to claim 1 in which the aluminium and refractory slurry are sprayed from nozzles which are located alongside each other and are moved relatively to the carbon electrode simultaneously.
Claim 6
Dependent Claim
65 words
A method according to claim 4 and in which the distance apart of the spray heads is sufficient to ensure that there is substantially no interference between the sprays of aluminium and refractory material, and also the distance is sufficient to ensure that the heat of the molten aluminium does not dry out the refractory material before it reaches the surface of the carbon article.
Claim 7
Dependent Claim
15 words
A method according to claim 1 in which the refractory slurry contains a thickening agent.
Claim 8
Dependent Claim
16 words
A method according to claim 6 and in which the thickening agent is sodium carboxymethyl cellulose.
Claim 9
Dependent Claim
40 words
A method according to claim 1 in which the refractory material comprises at least one member selected from the group consisting of aluminium powder, titanium dioxide, silicon metal powder, silicon carbide and boric acid, ferrochrome, bichromium trioxide and zirconium silicate.
Claim 10
Dependent Claim
36 words
A method according to claim 8 comprising applying a first coating of aluminium and refractory material, the refractory material being in accordance with claim 8, and then applying a second coating of aluminium and refractory material.
References Cited (Backward Citations)
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US1978415A
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US3019014A
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US3348929A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |