US4132554A
Expired / Lapsed
US
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Method for producing a sintered compact of boron nitride with high density form
Assignee: NOF Corp
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Filing: 1977-09-26
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Granted: 1979-01-02
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Expires: 1997-09-26
Abstract
Abstract A sintered compact of boron nitride with high density form having high oxidation resistance, water resistance, compressive strength and hardness can be obtained by sintering wurtzite-structured boron nitride together with a boride of titanium, zirconium or hafnium, or with mixtures thereof under a condition of high temperature and high pressure.
Inventors
- 👤 Shinroku Saito
- 👤 Akira Sawaoka
- 👤 Masatada Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A method for producing a sintered compact consisting substantially of high density boron nitride having wurtzite structure, consisting of sintering a powdered mixture consisting of wurtzite-structured boron nitride obtained by the shock compression method and at least one of titanium boride, zirconium boride and hafnium boride, the amount of the boride being 2-35% by weight based on the total amount of the boride and the boron nitride, for 1-60 minutes under a temperature-pressure condition within a parallelogram formed by connecting points of A (1,400° C, 80 Kb), B(1,300° C, 55Kb), C (1,650° C, 55 Kb) and D(1,750° C, 80 Kb) in a temperature pressure diagram, under which conditions the boride functions to suppress conversion of the wurtzite crystal structure.
Claim 2
Independent Claim
119 words
A method for producing a sintered compact consisting substantially of high density boron nitride having wurtzite structure, consisting of sintering a powdered mixture consisting of wurtzite-structured boron nitride obtained by the shock compression method and at least one of titanium boride, zirconium boride and hafnium boride, the amount of the boride being 2-35% by weight based on the total amount of the boride and the boron nitride, for 1-60 minutes under a temperature-pressure condition within a parallelogram formed by connecting points of A (1,400° C, 80 Kb), B(1,300° C, 55Kb), C (1,650° C, 55 Kb) and D(1,750° C, 80 Kb) in a temperature pressure diagram, under which conditions the boride functions to suppress conversion of the wurtzite crystal structure.
Claim 3
Independent Claim
121 words
A method for producing a sintered compact consisting substantially of very high density boron nitride having both wurtzite structure and zincblende structure in a wide mixing ratio, at least about 15% being wurtzite structure, consisting of sintering a powdered mixture of wurtzite-structured boron nitride obtained by the shock compression method and at least one of titanium boride, zirconium boride and hafnium boride, the amount of the boride being 2-35% by weight based on the total amount of the boride and the boron nitride, for 1-60 minutes under a temperature-pressure condition within a parallelogram formed by connecting points of E (1,770° C, 80 Kb), F(1,700° C, 62 Kb), G (1,980° C, 62 Kb) and H(2,050° C, 80 Kb) in a temperature-pressure diagram.
Claim 4
Independent Claim
121 words
A method for producing a sintered compact consisting substantially of very high density boron nitride having both wurtzite structure and zincblende structure in a wide mixing ratio, at least about 15% being wurtzite structure, consisting of sintering a powdered mixture of wurtzite-structured boron nitride obtained by the shock compression method and at least one of titanium boride, zirconium boride and hafnium boride, the amount of the boride being 2-35% by weight based on the total amount of the boride and the boron nitride, for 1-60 minutes under a temperature-pressure condition within a parallelogram formed by connecting points of E (1,770° C, 80 Kb), F(1,700° C, 62 Kb), G (1,980° C, 62 Kb) and H(2,050° C, 80 Kb) in a temperature-pressure diagram.
Claim 5
Dependent Claim
39 words
The method of claim 2, wherein the sintered boron nitride compact has a density of at least about 99 percent of the theoretical density based on the density of the boron nitride and added boride in the initial mixture.
References Cited (Backward Citations)
US3852078A
Cited
US3876751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |