US4592882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making aluminum-resistant titanium diboride articles
Assignee: Praxair ST Technology Inc
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Filing: 1984-04-16
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Granted: 1986-06-03
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Expires: 2004-04-16
Abstract
Abstract High strength titanium diboride (TiB 2 ) articles which are obtained by sintering articles preformed from TiB 2 powder mixed with epoxy resin by means of isostatic molding using sintering temperatures found to be a critical variable for achieving maximum strength. Resistance to aluminum attack is achieved by removing contaminating oxides, nitrides, and carbides of titanium by selecting either annealing the sintered article in a boron nitride (BN) pack or by including a small amount of BN or elemental boron in the original TiB 2 powder, such that the finished article is substantially free of such contaminants.
Inventors
- 👤 Lien N. Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:13
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63448; C04B35/63452; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C04B2235/00; C04B2235/65; C04B2235/656; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A method for making a shaped TiB 2 article essentially free of TiO, TiN, TiB and TiC cubic phase impurities comprising: forming said article from finely divided TiB 2 containing at least one of said impurities, a sintering aid, and a scavenger selected from the group consisting of BN and elemental boron; and sintering said article between about 1600° C. and about 2100° C. thereby reacting said scavenger with said impurities so that essentially none of said impurities or scavenger is present in said article after sintering.
Claim 2
Independent Claim
87 words
A method for making a shaped TiB 2 article essentially free of TiO, TiN, TiB and TiC cubic phase impurities comprising: forming said article from finely divided TiB 2 containing at least one of said impurities, a sintering aid, and a scavenger selected from the group consisting of BN and elemental boron; and sintering said article between about 1600° C. and about 2100° C. thereby reacting said scavenger with said impurities so that essentially none of said impurities or scavenger is present in said article after sintering.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said scavenger is added in the amount of from about 0.3 to about 1.2 weight percent.
Claim 4
Independent Claim
87 words
A method for making a shaped TiB 2 article essentially free of TiO, TiN and TiC cubic phase impurities comprising forming said article from finely divided TiB 2 containing at least one of said impurities and a sintering aid; sintering said article between about 1600° C. and about 2100° C.; and annealing said article in a BN pack between about 1700° C. and about 1900° C. thereby reacting said impurities with said pack so that essentially none of said impurities is present in said article after annealing.
Claim 5
Independent Claim
87 words
A method for making a shaped TiB 2 article essentially free of TiO, TiN and TiC cubic phase impurities comprising forming said article from finely divided TiB 2 containing at least one of said impurities and a sintering aid; sintering said article between about 1600° C. and about 2100° C.; and annealing said article in a BN pack between about 1700° C. and about 1900° C. thereby reacting said impurities with said pack so that essentially none of said impurities is present in said article after annealing.
Claim 6
Dependent Claim
21 words
The method of claim 1, 2 or 3 wherein said sintering temperature is between about 1975° C. and about 2025° C.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein said preforming is by isostatic molding.
References Cited (Backward Citations)
US3316062A
Cited
US4108670A
Cited
US4181584A
Cited
US4231853A
Cited
US4275026A
Cited
US4327186A
Cited
US4308114A
Cited
US4379852A
Cited
US4341611A
Cited
US4486544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |