Patent US4590034A successfully refreshed from Google Patents.
US4590034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing sintered body containing cubic boron nitride and method for preparing cubic boron nitride
Assignee: Tungaloy Corp
•
Filing: 1985-03-21
•
Granted: 1986-05-20
•
Expires: 2005-03-21
Abstract
Abstract Disclosed is a method for preparing a sintered body containing cubic boron nitride which comprise the steps of contacting a starting material containing boron nitride and/or a starting material containing at least one selected from the group consisting of metals of groups IVa, Va and VIa of the periodic table, silicon, aluminum, iron group metals and compounds of the aforesaid metals with at least one selected from the group consisting of borazine, a borazine derivative and a compound composed of boron, nitrogen and hydrogen as will release hydrogen by a thermal decomposition under pressure to form boron nitride; and sintering the material under conditions of a predetermined pressure and temperature under which cubic boron nitride is kept stable. Also disclosed is a method for preparing cubic boron nitride which comprises, in addition to the above steps, recovering cubic boron nitride from the obtained sintered body by a chemical and/or physical manner.
Inventors
- 👤 Shin-ichi Hirano
- 👤 Shigeharu Naka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
159 words
A method for preparing a sintered body containing cubic boron nitride which comprises the steps of: contacting (A) a starting material containing boron nitride and/or a starting material containing at least one selected from the group consisting of metals of groups IVb, Vb and VIb of the periodic table, silicon, aluminum, iron group metals, and compounds selected from the group consisting of carbides, nitrides and borides of the metals of said groups IVb, Vb, and VIb, AlN, AlB 12 , Al 2 O 3 , SiC, and Si 3 N 4 with (B) at least one selected from the group consisting of borazine, a borazine derivative and a compound comprised of boron, nitrogen and hydrogen which releases hydrogen by thermal decomposition under pressure to form boron nitride which is converted into cubic boron nitride at a predetermined pressure and temperature; and then sintering the material under predetermined conditions of pressure and temperature at which cubic boron nitride is stable.
Claim 2
Independent Claim
159 words
A method for preparing a sintered body containing cubic boron nitride which comprises the steps of: contacting (A) a starting material containing boron nitride and/or a starting material containing at least one selected from the group consisting of metals of groups IVb, Vb and VIb of the periodic table, silicon, aluminum, iron group metals, and compounds selected from the group consisting of carbides, nitrides and borides of the metals of said groups IVb, Vb, and VIb, AlN, AlB 12 , Al 2 O 3 , SiC, and Si 3 N 4 with (B) at least one selected from the group consisting of borazine, a borazine derivative and a compound comprised of boron, nitrogen and hydrogen which releases hydrogen by thermal decomposition under pressure to form boron nitride which is converted into cubic boron nitride at a predetermined pressure and temperature; and then sintering the material under predetermined conditions of pressure and temperature at which cubic boron nitride is stable.
Claim 3
Dependent Claim
32 words
The method for preparing a sintered body containing cubic boron nitride according to claim 1, wherein said predetermined pressure and temperature are 4.5 GPa or more and 700° C. or more, respectively.
Claim 4
Dependent Claim
51 words
The method for preparing a sintered body containing cubic boron nitride according to claim 1, wherein said starting material containing boron nitride is a material containing at least one selected from the group consisting of amorphous boron nitride, hexagonal boron nitride, wurtzite boron nitride, rhombohedral boron nitride and cubic boron nitride.
Claim 5
Dependent Claim
54 words
The method for preparing a sintered body containing cubic boron nitride according to claim 1, wherein said at least one selected from the group consisting of borazine, a borazine derivative and a compound composed of boron, nitrogen and hydrogen is at least one selected from the group consisting of borazine, borazonaphthaline, borazobiphenyl and 2,4-diaminoborazine.
Claim 6
Independent Claim
170 words
A method for preparing cubic boron nitride which comprises the steps of: contacting (A) a starting material containing boron nitride and/or a starting material containing at least one selected from the group consisting of metals of groups IVb, Vb and VIb of the periodic table, silicon, aluminum, iron group metals, and compounds selected from the group consisting of carbides, nitrides and borides of the metals of said groups IVb, Vb, and VIb, AlN, AlB 12 , Al 2 O 3 , SiC, and Si 3 N 4 with (B) at least one selected from the group consisting of borazine, a borazine derivative and a compound comprised of boron, nitrogen and hydrogen which releases hydrogen by thermal decomposition under pressure to form boron nitride which is converted into cubic boron nitride at a predetermined pressure and temperature; sintering the material under predetermined conditions of pressure and temperature at which cubic boron nitride is stable; and then recovering cubic boron nitride from the obtained sintered body by a chemical and/or physical process.
Claim 7
Independent Claim
170 words
A method for preparing cubic boron nitride which comprises the steps of: contacting (A) a starting material containing boron nitride and/or a starting material containing at least one selected from the group consisting of metals of groups IVb, Vb and VIb of the periodic table, silicon, aluminum, iron group metals, and compounds selected from the group consisting of carbides, nitrides and borides of the metals of said groups IVb, Vb, and VIb, AlN, AlB 12 , Al 2 O 3 , SiC, and Si 3 N 4 with (B) at least one selected from the group consisting of borazine, a borazine derivative and a compound comprised of boron, nitrogen and hydrogen which releases hydrogen by thermal decomposition under pressure to form boron nitride which is converted into cubic boron nitride at a predetermined pressure and temperature; sintering the material under predetermined conditions of pressure and temperature at which cubic boron nitride is stable; and then recovering cubic boron nitride from the obtained sintered body by a chemical and/or physical process.
Claim 8
Dependent Claim
28 words
The method for preparing cubic boron nitride according to claim 5, wherein said predetermined pressure and temperature are 4.5 GPa or more and 700° C. or more, respectively.
Claim 9
Dependent Claim
47 words
The method for preparing cubic boron nitride according to claim 5, wherein said starting material containing boron nitride is a material containing at least one selected from the group consisting of amorphous boron nitride, hexagonal boron nitride, wurtzite boron nitride, rhombohedral boron nitride and cubic boron nitride.
Claim 10
Dependent Claim
50 words
The method for preparing cubic boron nitride according to claim 5, wherein said at least one selected from the group consisting of borazine, a borazine derivative and a compound composed of boron, nitrogen and hydrogen is at least one selected from the group consisting of borazine, borazonaphthaline, borazobiphenyl and 2,4-diaminoborazine.
Claim 11
Dependent Claim
22 words
The method for preparing a sintered body containing cubic boron nitride according to claim 1, wherein said starting material is aluminum nitride.
Claim 12
Dependent Claim
18 words
The method for preparing cubic boron nitride according to claim 5, wherein said starting material is aluminum nitride.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |