US4486544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium boride based sintering composition and the use thereof in the manufacture of sintered articles
Assignee: Battelle Memorial Institute Inc
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Filing: 1982-08-27
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Granted: 1984-12-04
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Expires: 2002-08-27
Abstract
Abstract A powder composition suitable for the pressureless thermal sintering of articles which may be used in aluminium electro-thermics contains titanium boride with boron and titanium hydride as densifying additives. During sintering these additives form titanium boride. As this is identical to the substance of the sintered article the additives therefore do not constitute impurities in the sintered article.
Inventors
- 👤 Olivier de Pous
- 👤 Dominique Richon
- 👤 Hans Novotny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; B; B22; B22F; B22F3/00; B22F3/10; B22F3/1003; C04B35/622; C04B35/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A powder composition for pressureless sintering, consisting essentially of titanium boride and, as densifying additives, boron and titanium hydride in molar ratio 2:1, wherein said composition contains 2 to 10% of the densifying additives by weight.
Claim 2
Dependent Claim
36 words
A powder composition for pressureless sintering, consisting essentially of titanium boride and, as densifying additives, boron and titanium hydride in molar ratio 2:1, wherein said composition contains 2 to 10% of the densifying additives by weight.
Claim 3
Dependent Claim
21 words
A powder composition for pressureless sintering as claimed in claim 1 containing 3 to 7% of the densifying additives by weight.
Claim 4
Dependent Claim
19 words
A powder composition for pressureless sintering as claimed in claim 1 containing 5% of the said additives by weight.
Claim 5
Dependent Claim
31 words
A powder composition for pressureless sintering as claimed in claim 1, 2 or 3 in which the titanium boride powder has a specific surface area greater than 1 in 2 /gm.
Claim 6
Independent Claim
115 words
A method of making a sintered article of TiB 2 , which method comprises: (a) providing a powder mixture consisting essentially of titanium boride and, as densifying additives, boron and titanium hydride in molar ratio 2:1, wherein the powder mixture contains 2 to 10% of the densifying additives by weight, (b) molding the said powder mixture under a pressure of 1 to 6 ton/cm 2 to form a green article, (c) heating the green article under a vacuum, thereby degassing it and decomposing the titanium and hydrogen, and (d) heating the article in a vacuum or an inert atmosphere for 30-120 minutes at a temperature of 1800° C.-2200° C., thereby sintering and densifying the article.
Claim 7
Independent Claim
115 words
A method of making a sintered article of TiB 2 , which method comprises: (a) providing a powder mixture consisting essentially of titanium boride and, as densifying additives, boron and titanium hydride in molar ratio 2:1, wherein the powder mixture contains 2 to 10% of the densifying additives by weight, (b) molding the said powder mixture under a pressure of 1 to 6 ton/cm 2 to form a green article, (c) heating the green article under a vacuum, thereby degassing it and decomposing the titanium and hydrogen, and (d) heating the article in a vacuum or an inert atmosphere for 30-120 minutes at a temperature of 1800° C.-2200° C., thereby sintering and densifying the article.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 4 in which step (c) comprises progressively heating the green article to 800° C. under a pressure not exceeding 10 -4 Torr.
Claim 9
Dependent Claim
17 words
A method as claimed in claim 4 in which step (d) is performed in an argon atmosphere.
Claim 10
Dependent Claim
29 words
A method as claimed in claim 4 in which the powder mixture, before being molded, is mixed with an organic binder, and the binder is evaporated in step (c).
Claim 11
Dependent Claim
47 words
A green preform comprising a powder mixture consisting essentially of titanium boride with 2 to 10% of densifying additives in the form of boron and titanium hydride in a molar ratio of 2:1 and compressed at a pressure of 1 to 6 tons per cm 2 .
Claim 12
Dependent Claim
47 words
A green preform comprising a powder mixture consisting essentially of titanium boride with 2 to 10% of densifying additives in the form of boron and titanium hydride in a molar ratio of 2:1 and compressed at a pressure of 1 to 6 tons per cm 2 .
Claim 13
Dependent Claim
21 words
A method as claimed in claim 4 wherein the powder mixture contains 3 to 7% of the densifying additives by weight.
Claim 14
Dependent Claim
19 words
A method as claimed in claim 2 wherein the powder mixture contains 5% of the densifying additives by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |