Patent US4465581A successfully refreshed from Google Patents.
US4465581A
Expired / Lapsed
US
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Composite of TiB2 -graphite
Assignee: GREAT LAKES CARBON Corp
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Filing: 1981-07-27
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Granted: 1984-08-14
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Expires: 2001-07-27
Abstract
Abstract TiB2-graphite composite articles suitable for use as cathode components in a Hall aluminum reduction cell are made by impregnating a TiO2-carbon composite with a boron compound and carbon black dispersed in water, or alternately by impregnating a boron or boron compound-carbon composite with a carbon black-TiO2 dispersion, and heating the article to a reaction temperature whereby TiB2 is formed and the amorphous carbon converted to graphite. The article may be impregnated with a carbonizable liquid, re-baked, and re-heated to a graphitizing temperature to increase its strength and density.
Inventors
- 👤 Leslie H. Juel
- 👤 Louis A. Joo'
- 👤 Kenneth W. Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:11
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/622; C04B35/64; C04B35/645; C25; C25C; C25C3/00; C25C3/06; C25C3/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A process for the production of a composite TiB 2 -graphitic carbon article comprising the steps of: (1) Mixing TiO 2 , coke, and a liquid carbonizable binder to form a first plastic dispersion; (2) Shaping said dispersion to form an article; (3) Baking said article to carbonize said binder on a cycle from 1 to 10 days rising to a final temperature from 600° to 1100° C.; (4) Dispersing carbon black in liquid B 2 O 3 to form a second dispersion; (5) Impregnating said baked article with said second dispersion under a pressure from 2 to 15×10 3 Pa at a temperature from 100° to 500° C.; (6) Heating the impregnated, baked article to at least 1200° C. to a TiB 2 forming temperature and maintaining that temperature until the TiB 2 forming reaction is substantially completed; (7) Heating the article from (6) to at least 2100° C. to form said TiB 2 -graphitic carbon composite article.
Claim 2
Dependent Claim
159 words
A process for the production of a composite TiB 2 -graphitic carbon article comprising the steps of: (1) Mixing TiO 2 , coke, and a liquid carbonizable binder to form a first plastic dispersion; (2) Shaping said dispersion to form an article; (3) Baking said article to carbonize said binder on a cycle from 1 to 10 days rising to a final temperature from 600° to 1100° C.; (4) Dispersing carbon black in liquid B 2 O 3 to form a second dispersion; (5) Impregnating said baked article with said second dispersion under a pressure from 2 to 15×10 3 Pa at a temperature from 100° to 500° C.; (6) Heating the impregnated, baked article to at least 1200° C. to a TiB 2 forming temperature and maintaining that temperature until the TiB 2 forming reaction is substantially completed; (7) Heating the article from (6) to at least 2100° C. to form said TiB 2 -graphitic carbon composite article.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the TiO 2 used is a ceramic pigment grade.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the coke is a calcined petroleum coke with a mean particle size of 3 mm.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the carbon used is a rubber reinforcing grade of carbon black.
Claim 6
Dependent Claim
73 words
The process of claim 1 wherein after the article is heated to the TiB 2 forming temperature, it is cooled, then impregnated under from 2 to 15×10 3 Pa pressure at from 200° to 250° C. with a petroleum pitch having a softening point from 110° to 120° C., then baked on a cycle with the temperature rising to 600° to 1100° C. over 2 to 10 days before graphitization at 2300° C.
Claim 7
Dependent Claim
29 words
The process of claim 1 wherein the article is impregnated with the second dispersion and baked a plurality of times, dried, then heated to a TiB 2 forming temperature.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the second dispersion is a dispersion of carbon black in molten B 2 O 3 .
Claim 9
Dependent Claim
39 words
The process of claim 1 wherein the second dispersion is a dispersion of carbon black and B 2 O 3 in H 2 O, the article then being heated to about 100° C. to vaporize the H 2 O.
Claim 10
Dependent Claim
65 words
The process of claim 6 wherein after heating to a boride forming temperature the article is re-impregnated with the second dispersion under alternate cycles of vacuum and pressure of from 2 to 15×10 3 Pa at 200° to 250° C., rebaked on a cycle of 2 to 10 days, the temperature rising to 700° to 1100° C., then graphitized at a temperature of 2300° C.
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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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |