US3914508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating for protecting a carbon substrate in a moist oxidation environment
Assignee: Bendix Corp
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Filing: 1973-01-18
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Granted: 1975-10-21
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Expires: 1993-01-18
Abstract
Abstract A method of preventing oxidation of a carbon substrate in a moist environment by applying a coating to the surface of the substrate. Initially, the coating is a mixture of powders comprised of a carbonizable resin from 10-40% by weight, Boron or Boron compounds from 15-40% by weight and a modifier, preferably Chromium, from 10-70% by weight of the total mix. These powders are combined with a liquid carrier to form a slurry. A layer of this slurry is applied to the surface of the carbon substrate. The coated carbon substrate is then slowly heated to first remove the liquid carrier and later to cure the resin. After the resin is cured, the temperature is further raised in an inert atmosphere to carbonize the resin. When the resin is carbonized, a matrix bond is formed with the substrate for holding the Boron and modifier adjacent to the surface to be protected. Upon exposure of the coated surface of the carbon substrate to a high temperature, the Boron and the modifier mutually react with oxygen to form a water insoluble surface through which the penetration of oxygen is inhibited.
Inventors
- 👤 Norris A Hooton
- 👤 Norman E Jannasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C01; C01B; C01B32/00; C04B35/5626; C04B35/563; C04B41/00; C04B41/45; C04B41/50; C04B41/5025; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
A CARBON FRICTION HAVING A SELECTED SURFACE WITH A COATING THEREON FOR PROTECTING AN UNDERLYING CARBON FRICTION LINING FROM OXIDIZING IN A MOIST ATMOSPHERE AT TEMPERATURES RANGING FROM 1200* - 2500*F., SAID COATING COMPRISING: A FIRST MATERIAL SELECTED FROM THE GROUP CONSISTING OF BORON, BORON OXIDES, BORON CARBIDES, BORON NITRIDE AND OTHER BORON COMPOUNDS IN WHICH BORON COMPRISES AT LEAST 25% OF THE COMPOUND WEIGHT, SAID SELECTED MATERIAL COMPRISING FROM 10-60 WEIGHT PER CENT OF THE INTITIAL TOTAL COATING, A SECOND MATERIAL SELECTED FROM THE GROUP CONSISTING OF CHROMINUM, VANADIUM, MOLYBDENUM, NIBIUM, TUNGSTEN, TANTALUM, AND OXIDES OF THESE ELEMENT IN WHICH SAID ELEMENT COMPRISES AT LEAST 50% OFTHE OXIDES WEIGHT, SAID SELECTED MODIFIERR ,ATERIAL COMPRISING FROM 10-85 WEIGHT PER CENT OF THE INITIAL TOTAL COATING, AND A CARBONIZABLE RESIN COMPRISING FROM 5-50 WEIGHT PER CENT OF THE INITIAL TOTAL COATING, SAID CORBONIZABLE RESIN FORMING A MATRIX BOND WITH SAID CARBON FRICTION LINING TO HOLD THE SELECTED MATERIAL AND THE SECOND MATERIAL ADJACENT TO THE SELECTED SURFACE UPON BEING CHARRED UP TO A TEMPERATURE OF 2000*F. IN A NON-OXIDIZING ATMOSPHERE, SAID FIRST AND SECOND SELECTED MATERIALS REACTING MUTUALLY WITH OXYGEN IN AN OXXIDIZING ATMOSPHERE TO FORM WATER INSKOLUBLE OXIDE SURFACE THROUGH WHICH THE PENETRATION OF OXYGEN IS INIBITED.
Claim 2
Dependent Claim
207 words
A CARBON FRICTION HAVING A SELECTED SURFACE WITH A COATING THEREON FOR PROTECTING AN UNDERLYING CARBON FRICTION LINING FROM OXIDIZING IN A MOIST ATMOSPHERE AT TEMPERATURES RANGING FROM 1200* - 2500*F., SAID COATING COMPRISING: A FIRST MATERIAL SELECTED FROM THE GROUP CONSISTING OF BORON, BORON OXIDES, BORON CARBIDES, BORON NITRIDE AND OTHER BORON COMPOUNDS IN WHICH BORON COMPRISES AT LEAST 25% OF THE COMPOUND WEIGHT, SAID SELECTED MATERIAL COMPRISING FROM 10-60 WEIGHT PER CENT OF THE INTITIAL TOTAL COATING, A SECOND MATERIAL SELECTED FROM THE GROUP CONSISTING OF CHROMINUM, VANADIUM, MOLYBDENUM, NIBIUM, TUNGSTEN, TANTALUM, AND OXIDES OF THESE ELEMENT IN WHICH SAID ELEMENT COMPRISES AT LEAST 50% OFTHE OXIDES WEIGHT, SAID SELECTED MODIFIERR ,ATERIAL COMPRISING FROM 10-85 WEIGHT PER CENT OF THE INITIAL TOTAL COATING, AND A CARBONIZABLE RESIN COMPRISING FROM 5-50 WEIGHT PER CENT OF THE INITIAL TOTAL COATING, SAID CORBONIZABLE RESIN FORMING A MATRIX BOND WITH SAID CARBON FRICTION LINING TO HOLD THE SELECTED MATERIAL AND THE SECOND MATERIAL ADJACENT TO THE SELECTED SURFACE UPON BEING CHARRED UP TO A TEMPERATURE OF 2000*F. IN A NON-OXIDIZING ATMOSPHERE, SAID FIRST AND SECOND SELECTED MATERIALS REACTING MUTUALLY WITH OXYGEN IN AN OXXIDIZING ATMOSPHERE TO FORM WATER INSKOLUBLE OXIDE SURFACE THROUGH WHICH THE PENETRATION OF OXYGEN IS INIBITED.
Claim 3
Dependent Claim
31 words
The carbon friction lining as recited in claim 1 wherein the selected second material is Chromium added in the range of from 10-70 weight per cent of the initial total coating.
Claim 4
Dependent Claim
31 words
The carbon friction lining as recited in claim 2 wherein the selected first material is Boron added in the range of from 15-40 weight per cent of the initial total coating.
Claim 5
Dependent Claim
31 words
The carbon friction lining as recited in claim 1 wherein the selected first material is Boron added in the range of from 10-45 weight per cent of the initial total coating.
Claim 6
Dependent Claim
31 words
The carbon friction lining as recited in claim 4 wherein the selected second material is Tungsten added in the range of from 70-85 weight per cent of the initial total coatinG.
Claim 7
Dependent Claim
31 words
The carbon friction lining as recited in claim 4 wherein the selected second material is Molybdenum added in the range of from 65-80 weight per cent of the initial total coating.
Claim 8
Dependent Claim
32 words
The carbon friction lining as recited in claim 4 wherein the selected second material is Chromium Oxide added in the range of from 40-50 weight per cent of the initial total coating.
Claim 9
Dependent Claim
31 words
The carbon friction lining as recited in claim 4 wherein the selected second material is Tantalum added in the range of from 70-85 weight per cent of the initial total coating.
Claim 10
Dependent Claim
35 words
The carbon friction lining as recited in claim 4 wherein the selected second material is Chromium Oxide and alloys thereof added in the range of from 40-50 weight per cent of the initial total coating.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |