Patent US3854979A successfully refreshed from Google Patents.
US3854979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for applying glassy carbon coatings
Assignee: Aerospace Corp
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Filing: 1972-06-29
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Granted: 1974-12-17
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Expires: 1992-06-29
Abstract
Abstract A process is provided for coating ceramic oxide, carbon and graphite substrates with a thin, well adhered surface layer of impervious, vitreous or glassy carbon glaze. Polyvinylchloride, polyvinylfluoride or other natural or synthetic organic substance is decomposed by heating in an inert atmosphere at 375* - 410* C. for 5 to 100 minutes. The decomposition product is dissolved in an aromatic solvent, preferably benzene or toluene. The substrate is coated in the solution by dipping and baked for about 12 minutes in an inert atmosphere at 800* - 1200* C. Repeated coatings may be applied for a thicker carbon glaze.
Inventors
- 👤 R Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:30
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B35/00; C04B35/515; C04B35/52; C04B35/521; C04B35/524; C04B41/45; C04B41/50; C04B41/5001; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
THE PROCESS OF GLAZING AN ARTICLE FORMED FROM CARBON OR CERAMIC MATERIAL SAID PROCESS COMPRISING: A. FIRST HEATING A MASS OF AN ORGANIC GLASSY-CARBON PRECURSOR MATERIAL SELECTED FROM THE GROUP COMPRISING HALOGENATED LINEAR POLYMERS AND NATURAL ORGANIC POLYMERS IN AN INERT ATMOSPHERE UNTIL DECOMPOSITION TO A PITCH-LIKE COMPOUND HAVING THE APPROXIMATE EMPIRICAL FORMULA CNHN, WHERE N IS A WHOLE NUMBER, B. BLENDING THE RESULTANT COMPOUND WITH AN AROMATIC SOLVENT TO FORM A SLURRY, C. COATING THE ARTICLE WITH THE SLURRY, AND, D. BAKING THE ARTICLE AT AN ELEVATED TEMPERATURE IN AN INERT ATMOSPHERE UNTIL THE COATING IS TRANSFORMED TO GLASSY CARBON.
Claim 2
Dependent Claim
101 words
THE PROCESS OF GLAZING AN ARTICLE FORMED FROM CARBON OR CERAMIC MATERIAL SAID PROCESS COMPRISING: A. FIRST HEATING A MASS OF AN ORGANIC GLASSY-CARBON PRECURSOR MATERIAL SELECTED FROM THE GROUP COMPRISING HALOGENATED LINEAR POLYMERS AND NATURAL ORGANIC POLYMERS IN AN INERT ATMOSPHERE UNTIL DECOMPOSITION TO A PITCH-LIKE COMPOUND HAVING THE APPROXIMATE EMPIRICAL FORMULA CNHN, WHERE N IS A WHOLE NUMBER, B. BLENDING THE RESULTANT COMPOUND WITH AN AROMATIC SOLVENT TO FORM A SLURRY, C. COATING THE ARTICLE WITH THE SLURRY, AND, D. BAKING THE ARTICLE AT AN ELEVATED TEMPERATURE IN AN INERT ATMOSPHERE UNTIL THE COATING IS TRANSFORMED TO GLASSY CARBON.
Claim 3
Dependent Claim
20 words
The process is defined in claim 1 wherein the article is subjected to a plurality of coating and baking steps.
Claim 4
Dependent Claim
15 words
The process defined in claim 1 wherein the organic precursor material is a polyvinyl resin.
Claim 5
Dependent Claim
36 words
The process is defined in claim 3 wherein the organic precursor is polyvinylchloride, the first heating is at a temperature of about 395* C. and the baking is at a temperature of more than 800* C.
Claim 6
Dependent Claim
31 words
The process as defined in claim 3 wherein prior to the first heating the mass of organic material is ground to a sand-like granularity and wetted with a heat transfer medium.
Claim 7
Dependent Claim
12 words
The process as defined in claim 1 wherein the solvent is benzene.
Claim 8
Dependent Claim
21 words
The process as defined in claim 1 wherein the organic precusor material is petroleum and the resultant compound is pretroleum pitch.
Claim 9
Dependent Claim
32 words
The process defined in claim 1 wherein the aromatic solvent is benzene and the concentration of the resultant compound in the slurry is between 200 and 450 grams per liter of solution.
Claim 10
Dependent Claim
89 words
The process of applying a glassy carbon coating to a ceramic or carbon substrate comprising dissolving a pitch-like composition having the approximate empirical formula CnHn, where n is a whole number, in an aromatic solvent to provide a slurry, said slurry containing from 200 - 450 grams of the pitch-like composition per liter of solution; applying a coating of the slurry to the substrate; and baking the coated substrate in an inert atmosphere at a temperature of at least 800* C. until the coating is transformed to glassy carbon.
Claim 11
Dependent Claim
89 words
The process of applying a glassy carbon coating to a ceramic or carbon substrate comprising dissolving a pitch-like composition having the approximate empirical formula CnHn, where n is a whole number, in an aromatic solvent to provide a slurry, said slurry containing from 200 - 450 grams of the pitch-like composition per liter of solution; applying a coating of the slurry to the substrate; and baking the coated substrate in an inert atmosphere at a temperature of at least 800* C. until the coating is transformed to glassy carbon.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |