Patent US3812239A successfully refreshed from Google Patents.
US3812239A
Expired / Lapsed
US
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Preparation of submicron titanium carbide
Assignee: PPG Industries Inc
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Filing: 1970-08-24
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Granted: 1974-05-21
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Expires: 1990-08-24
Abstract
Abstract Titanium carbide, predominantly in the form of small cubic crystals and having a weight average particle size in the range of from 0.04 to 0.9 micron, is formed by reacting, in the vapor state, titanium halide, reducing agent and carbon source at carbide-forming temperatures. Control and variation of the weight average particle size produced in the above range is accomplished by introducing into the reaction zone from 1 to 100 moles of auxiliary gas per mole of titanium halide reactant.
Inventors
- 👤 L Swaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:23
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/921; C01P; C01P2004/00; C01P2004/51; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
12 words
The process of claim 1 wherein said titanium halide is titanium tetrachloride.
Claim 2
Dependent Claim
21 words
The process of claim 1 wherein said hot hydrogen-containing gas has a temperature of from about 1500* C. to 4000* C.
Claim 3
Dependent Claim
17 words
The process of claim 3 wherein said hot hydrogen-containing gas has been heated by a plasma generator.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said auxiliary gas is hydrogen.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein said hot hydrogen-containing gas has a heat content sufficient to maintain said vapor phase reaction.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein said titanium halide is titanium tetrachloride and said carbon source is 1,1,2-trichloroethane.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein at least a portion of said auxiliary gas is introduced with the titanium halide reactant.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein said reactants are introduced separately into the stream of hot hydrogen-containing gas.
Claim 9
Dependent Claim
18 words
The process of claim 10 wherein said auxiliary gas is introduced as a shroud gas for the reactants.
Claim 10
Dependent Claim
14 words
The process of claim 11 wherein said shroud gas is located between the reactants.
Claim 11
Dependent Claim
22 words
The process of claim 1 wherein said auxiliary gas is introduced into the reactor in the vicinity of the principal reaction zone.
Claim 12
Dependent Claim
20 words
The process of claim 1 wherein from 5 to 50 moles of auxiliary gas are introduced into the reaction zone.
Claim 13
Dependent Claim
169 words
In the process of producing titanium carbide by vapor phase reaction of reactants titanium tetrachloride and a volatile source of carbon selected from C1 - C12 hydrocarbons, C1 - C12 halogenated hydrocarbons and mixtures of such compounds, the improvement which comprises establishing a stream of hot hydrogen-containing gas in a reaction zone within a reactor, introducing the reactants and from 1 to 100 moles of auxiliary gas per mole of titanium tetrachloride reactant into the reaction zone, the temperature of the auxiliary gas introduced into said reaction zone being from 15* -200* C, thereby producing in said reaction zone a suspension of titanium carbide particles, removing the titanium carbide suspension from the reaction zone, analyzing the titanium carbide particles for particle size and increasing or decreasing the amount of auxiliary gas introduced into said reaction zone to decrease or increase respectively the size of said titanium carbide particles to maintain the weight average particle size of said titanium carbide particles within a range of from 0.04 to 0.9 microns.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |