US4452767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing oxide contamination from titanium diboride powder
Assignee: United States, DOE, Secretary of
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Filing: 1983-04-26
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Granted: 1984-06-05
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Expires: 2003-04-26
Abstract
Abstract A method for removing oxide contamination from titanium diboride powder involves the direct chemical treatment of TiB2 powders with a gaseous boron halide, such as BCl3, at temperatures in the range of 500 DEG -800 DEG C. The BCl3 reacts with the oxides to form volatile species which are removed by the BCl3 exit stream.
Inventors
- 👤 Jorulf Brynestad
- 👤 Carlos E. Bamberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:56
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/02; C01B35/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
A method for purifying titanium diboride powder contaminated with an oxide selected from the group consisting of TiO 2 , Ti 2 O 3 , Al 2 O 3 , SiO 2 , and B 2 O 3 , comprising: contacting the contaminated titanium diboride powder with an excess amount of gaseous BCl 3 to thereby form gaseous (BOCl) 3 by reaction of said BCl 3 with said oxide; and separating the gaseous (BOCl) 3 from the titanium diboride powder.
Claim 2
Independent Claim
80 words
A method for purifying titanium diboride powder contaminated with an oxide selected from the group consisting of TiO 2 , Ti 2 O 3 , Al 2 O 3 , SiO 2 , and B 2 O 3 , comprising: contacting the contaminated titanium diboride powder with an excess amount of gaseous BCl 3 to thereby form gaseous (BOCl) 3 by reaction of said BCl 3 with said oxide; and separating the gaseous (BOCl) 3 from the titanium diboride powder.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said gaseous BCl 3 is contacted with said contaminated titanium diboride powder at a temperature in the range of about 500° C. to about 850° C.
References Cited (Backward Citations)
US3853541A
Cited
US4288411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |