US3661523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of titanium carbide
Assignee: PPG Industries Inc
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Filing: 1970-04-14
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Granted: 1972-05-09
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Expires: 1990-04-14
Abstract
Abstract Titanium carbide, usually in finely divided, particulate form, and often predominantly in the form of small cubic crystals having a particle size range of from about 0.02 to about 1.0 micron and a weight median particle size of from about 0.08 to about 0.8 micron, is formed by reacting titanium halide in vapor state with a reducing agent and carbon source at carbide forming temperatures. Reduction of impurity levels present in the titanium carbide product, e.g., oxygen and halogen, is obtained by collecting the titanium carbide product at temperatures of from about 350* C. to 1,500* C. in the substantial absence of air.
Inventors
- 👤 Robert S Sheppard
- 👤 William L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:18
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/921; B; B82; B82Y; B82Y30/00; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
17 words
The process of claim 1 wherein said titanium halide is titanium tetrachloride and said halogen is chlorine.
Claim 2
Dependent Claim
27 words
The process of claim 2 wherein said source of carbon is selected from the group consisting of hydrocarbons and halogenated hydrocarbons and said reducing agent is hydrogen.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein an inert gas atmosphere is maintained above the product titanium carbide during step (c).
Claim 4
Dependent Claim
13 words
The process of claim 4 wherein said inert gas is argon or hydrogen.
Claim 5
Dependent Claim
117 words
A process for producing titanium carbide which comprises, in combination, the steps of (a) reacting in the vapor phase titanium tetrachloride, a source of carbon and reducing agent in an enclosed reaction zone at temperatures above 1,500* C. thereby producing finely divided titanium carbide, (b) removing titanium carbide product from said reaction zone, (c) subjecting titanium carbide product thus removed to temperatures of from about 350* C. to about 1,000* C. for a time sufficient to remove volatile halogen-containing species adsorbed on the product surface, said steps (a), (b) and (c) being performed in the substantial absence of air, and (d) recovering finely divided titanium carbide having less than 0.7 weight percent each of oxygen and halogen.
Claim 6
Dependent Claim
129 words
A process for producing titanium carbide which comprises, in combination, the successive steps of (a) reacting in the vapor phase titanium halide, a source of carbon selected from the group consisting of hydrocarbons and halogenated hydrocarbons and hydrogen in an enclosed reaction zone at temperatures above 1, 500* C. thereby producing finely divided titanium carbide, (b) removing titanium carbide product from said reaction zone, (c) subjecting titanium carbide product thus removed to temperatures of from about 350* C. to about 1,000* C. for a time sufficient to remove volatile halogen-containing species adsorbed on the product surface, said steps (a), (b) and (c) being performed in the substantial absence of air, and (d) recovering finely divided titanium carbide having less than about 0.5 weight percent each of oxygen and halogen.
Claim 7
Dependent Claim
17 words
The process of claim 7 wherein said titanium halide is titanium tetrachloride and said halogen is chlorine.
Claim 8
Dependent Claim
19 words
The process of claim 7 wherein the temperatures of step (c) are from 350* C. to about 800* C.
Claim 9
Dependent Claim
20 words
The process of claim 9 wherein an inert gas atmosphere is maintained above the titanium carbide during said heat treatment.
Claim 10
Dependent Claim
13 words
The process of claim 10 wherein said inert gas is argon or hydrogen.
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |