US4379852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boride-based refractory materials
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1981-03-06
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Granted: 1983-04-12
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Expires: 2001-03-06
Abstract
Abstract The invention provides a novel highly refractory sintered body based on a metal diboride such as TiB2 or Mo2B5 and W2B5 containing a binder ingredient. The high-temperature performance of the sintered body is further improved by including an auxiliary additive ingredient selected from several carbides, nitrides, silicides and oxides such as WC, TiC, TaN, TiN, MoSi2, TiO2, Al2O3, B2O3 and the like in a limited amount.
Inventors
- 👤 Tadahiko Watanabe
- 👤 Shinichi Kono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078; C04B35/626; C04B35/63; C04B35/6303
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A refractory sintered body composed essentially of (a) at least 30% by weight of at least one metal boride selected from the group consisting of MB 2 type diborides of titanium, vanadium, niobium, tantalum, chromium, molybdenum, manganese, zirconium, hafnium, and aluminum and M 2 B 5 type borides of molybdenum and tungsten, (b) from 0.01 to 50% by weight of at least one binder ingredient selected from the group consisting of the borides of nickel, iron, cobalt, manganese and titanium other than the MB 2 type diborides and alloys of nickel and phosphorus, and (c) from 0.1 to 50% by weight of at least one additive ingredient selected from the group consisting of WC, TiC, TaC, NbC, VC, ZrO 2 , TiN, ZrN, TaN, and VN, the balance being substantially the metal boride of the component (a), or (d) the metal boride of the component (a) and up to 40% by weight, based on the sintered body, of at least one MB type boride of a metal selected from the group consisting of tantalum, niobium, tungsten, zirconium, hafnium, molybdenum, and vanadium.
Claim 2
Dependent Claim
181 words
A refractory sintered body composed essentially of (a) at least 30% by weight of at least one metal boride selected from the group consisting of MB 2 type diborides of titanium, vanadium, niobium, tantalum, chromium, molybdenum, manganese, zirconium, hafnium, and aluminum and M 2 B 5 type borides of molybdenum and tungsten, (b) from 0.01 to 50% by weight of at least one binder ingredient selected from the group consisting of the borides of nickel, iron, cobalt, manganese and titanium other than the MB 2 type diborides and alloys of nickel and phosphorus, and (c) from 0.1 to 50% by weight of at least one additive ingredient selected from the group consisting of WC, TiC, TaC, NbC, VC, ZrO 2 , TiN, ZrN, TaN, and VN, the balance being substantially the metal boride of the component (a), or (d) the metal boride of the component (a) and up to 40% by weight, based on the sintered body, of at least one MB type boride of a metal selected from the group consisting of tantalum, niobium, tungsten, zirconium, hafnium, molybdenum, and vanadium.
Claim 3
Dependent Claim
33 words
The refractory sintered body as claimed in claim 1 wherein the binder ingredient as the component (b) is selected from the group consisting of MnB, TiB, NiB, Ni 4 B, CoB and FeB.
Claim 4
Dependent Claim
22 words
The refractory sintered body as claimed in claim 1 in which the balance is substantially the metal boride of the component (a).
Claim 5
Dependent Claim
22 words
The refractory sintered body as claimed in claim 1 in which the balance is substantially the metal borides of the component (d).
Claim 6
Dependent Claim
17 words
The refractory sintered body of claim 1 or claim 4 which contains MB 2 type titanium diboride.
Claim 7
Dependent Claim
28 words
The refractory sintered body of claim 1 having a bending strength greater than 200 Kg/mm 2 , and a Vickers hardness of at least 2000 at 1000° 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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |