US5019540A
Expired / Lapsed
US
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Metal diboride base sintered ceramic and method of producing same
Assignee: Central Glass Co Ltd
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Filing: 1990-03-09
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Granted: 1991-05-28
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Expires: 2010-03-09
Abstract
Abstract The invention provides a sintered ceramic of which the principal component is TiB 2 and/or ZrB 2 . The sintered ceramic contains a vanadium compound such as VC, VB or VN and/or a molybdenum compound such as MoC, MoSi 2 or MoB such that the content of V and/or Mo is 0.5-99.5 wt % of the principal component. Furthermore, the sintered ceramic contains at least one nitride such as TiN, ZrN, TaN or CrN amounting to 1-50 wt % of the principal component and carbon amounting to 0.5-10 wt % of the principal component. The sintered ceramic is high in hardness and mechanical strength and, by virtue of including a nitride in the additives, is particularly enhanced in fracture toughness. The sintered ceramic is produced by mixing a principal material, TiB 2 and/or ZrB 2 , with at least one vanadium or molybdenum compound, or elementary V and/or Mo, at least one nitride and carbon or a carbonizable material, compacting the resulting mixture into a shaped body and sintering the shaped body in vacuum or a nonoxidizing gas atmosphere at 1600°-2200° C.
Inventors
- 👤 Toru Kuramoto
- 👤 Hitoshi Tukuda
- 👤 Hiroshi Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A metal diboride base sintered ceramic, consisting essentially of: a base component which is at least one metal diboride selected from the group consisting of TiB 2 and ZrB 2 ; an auxiliary component which is at least one metal compound selected from the group consisting of VC, VN, MoSi 2 , MoC and MoN, the amount of said auxiliary component being such that the total content of V and Mo in the sintered ceramic is 0.5-99.5 wt % of said base component; at least one nitride which is selected from the group consisting of TiN, ZrN, TaN, NbN, CrN, AlN and BN and amounts, in total, to 1-50 wt % of said base component; and carbon amounting to 0.5-10 wt % of said base component and existing as carbides.
Claim 2
Dependent Claim
130 words
A metal diboride base sintered ceramic, consisting essentially of: a base component which is at least one metal diboride selected from the group consisting of TiB 2 and ZrB 2 ; an auxiliary component which is at least one metal compound selected from the group consisting of VC, VN, MoSi 2 , MoC and MoN, the amount of said auxiliary component being such that the total content of V and Mo in the sintered ceramic is 0.5-99.5 wt % of said base component; at least one nitride which is selected from the group consisting of TiN, ZrN, TaN, NbN, CrN, AlN and BN and amounts, in total, to 1-50 wt % of said base component; and carbon amounting to 0.5-10 wt % of said base component and existing as carbides.
Claim 3
Dependent Claim
37 words
A sintered ceramic body according to claim 1, wherein the amount of said auxiliary component is such that the total content of V and Mo in the sintered ceramic is 2-60 wt % of said base component.
Claim 4
Independent Claim
191 words
A method of producing a metal diboride base sintered ceramic body, comprising the steps of: (a) mixing 100 parts by weight of a powdery principal material, which is at least one metal diboride selected from the group consisting of TiB 2 and ZrB 2 , with 0.5 to 99.5 parts by weight of at least one metal selected from the group consisting of V and Mo, said at least one metal being in the form of a powder of at least one metal compound selected from the group consisting of VC, VN, MoSi 2 , MoC and MoN; 1 to 50 parts by weight of a powder of at least one nitride selected from the group consisting of TiN, ZrN, TaN, NbN, CrN, AlN and BN; and 0.5 to 10 parts by weight of carbon in the form of a carbonaceous material selected from the group consisting of graphite, carbon black and carbonizable organic materials; (b) compacting the mixture obtained at step (a) into a shaped body; and (c) sintering said shaped body in vacuum or a nonoxidizing gas atmosphere at a temperature in the range from 1600° to 2200° C.
Claim 5
Independent Claim
191 words
A method of producing a metal diboride base sintered ceramic body, comprising the steps of: (a) mixing 100 parts by weight of a powdery principal material, which is at least one metal diboride selected from the group consisting of TiB 2 and ZrB 2 , with 0.5 to 99.5 parts by weight of at least one metal selected from the group consisting of V and Mo, said at least one metal being in the form of a powder of at least one metal compound selected from the group consisting of VC, VN, MoSi 2 , MoC and MoN; 1 to 50 parts by weight of a powder of at least one nitride selected from the group consisting of TiN, ZrN, TaN, NbN, CrN, AlN and BN; and 0.5 to 10 parts by weight of carbon in the form of a carbonaceous material selected from the group consisting of graphite, carbon black and carbonizable organic materials; (b) compacting the mixture obtained at step (a) into a shaped body; and (c) sintering said shaped body in vacuum or a nonoxidizing gas atmosphere at a temperature in the range from 1600° to 2200° C.
Claim 6
Dependent Claim
22 words
A method according to claim 1, wherein said organic material is selected from the group consisting of phenol resin and furan resin.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein the total amount of said at least one metal is from 2 to 60 parts by weight.
Claim 8
Dependent Claim
17 words
A method according to claim 1, wherein the sintering at step (c) is performed under normal pressure.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |