US4990403A
Expired / Lapsed
US
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Diamond coated sintered body
Assignee: Niterra Co Ltd
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Filing: 1990-01-02
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Granted: 1991-02-05
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Expires: 2010-01-02
Abstract
Abstract The present invention provides a diamond coated sintered body characterized by having a diamond film formed by a gas phase synthesis method on the surface of a sintered body obtained from a mixture of tungsten carbide and at least one compound selected from the group consisting of carbide and nitride of silicon or boron and, if necessary, additionally at least one compound selected from the group consisting of carbide, oxide, nitride, carbonitride, carbonate, boride and organic compound of at least one element selected from the group consisting of metals and rare earth elements belonging to Groups Ia, IIa, IIIa, IVa, Va, IIIb and IVb of the Mendelejeff's periodic table.
Inventors
- 👤 Toshimichi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:57
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/10; C04B41/45; C04B41/50; C04B41/5001; C04B41/5002; C04B41/80; C04B41/81; C04B41/85; C23; C23C; C23C16/00; C23C16/22; C23C16/26; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A diamond coated sintered body comprising: (1) a sintered body prepared from a mixture consisting essentially of (A) tungsten carbide and (B) at least one compound selected from the group consisting of carbides and nitrides of silicon or boron; and (2) a diamond film formed on the surface of said sintered body by a gas synthesis method.
Claim 2
Dependent Claim
57 words
A diamond coated sintered body comprising: (1) a sintered body prepared from a mixture consisting essentially of (A) tungsten carbide and (B) at least one compound selected from the group consisting of carbides and nitrides of silicon or boron; and (2) a diamond film formed on the surface of said sintered body by a gas synthesis method.
Claim 3
Dependent Claim
37 words
A diamond coated sintered body according to claim 1, wherein said mixture is a mixture of WC and at least one compound selected from the group consisting of SiC, Si 3 N 4 and B 4 C.
Claim 4
Dependent Claim
44 words
A diamond coated sintered body according to claim 1, wherein said diamond film is formed by contacting a gas obtained by exciting a gas mixture of hydrogen gas and carbon monoxide by a microwave plasma CVD method with the surface of said sintered body.
Claim 5
Dependent Claim
33 words
A diamond coated sintered body according to claim 1, wherein the amount of component (B) is in the range of 1-90% by weight, based on the combined weight of components (A) and (B).
Claim 6
Dependent Claim
108 words
A diamond coated sintered body comprising: (1) a sintered body prepared from a mixture consisting essentially of (A) tungsten carbide, (B) at least one compound selected from the group consisting of carbides and nitrides of silicon or boron, and (C) at least one compound selected from the group consisting of carbides, oxides, nitrides, carbonitrides, carbonates, borides and organic compounds of at least one element selected from the group consisting of metals and rare earth elements belonging to Groups Ia, IIa, IIIa, IVa, Va, IIIb and IVb of Mendelejeff's periodic table; and (2) a diamond film formed on the surface of said sintered body by a gas synthesis method.
Claim 7
Dependent Claim
108 words
A diamond coated sintered body comprising: (1) a sintered body prepared from a mixture consisting essentially of (A) tungsten carbide, (B) at least one compound selected from the group consisting of carbides and nitrides of silicon or boron, and (C) at least one compound selected from the group consisting of carbides, oxides, nitrides, carbonitrides, carbonates, borides and organic compounds of at least one element selected from the group consisting of metals and rare earth elements belonging to Groups Ia, IIa, IIIa, IVa, Va, IIIb and IVb of Mendelejeff's periodic table; and (2) a diamond film formed on the surface of said sintered body by a gas synthesis method.
Claim 8
Dependent Claim
56 words
A diamond coated sintered body according to claim 5, wherein said component (C) is at least one compound selected from the group consisting of carbides, oxides and nitrides of at least one element selected from the group consisting of metals and rare earth elements belonging to Groups IIa, IIIa, IVa and IIIb of Mendelejeff's periodic table.
Claim 9
Dependent Claim
46 words
A diamond coated sintered body according to claim 5, wherein said component (C) is at least one compound selected from the group consisting of carbides, oxides and nitrides of at least one element selected from the group consisting of Mg, Y, B, Al, Ti and Zr.
Claim 10
Dependent Claim
40 words
A diamond coated sintered body according to claim 5, wherein said component (C) is at least one compound selected from the group consisting of Y 2 O 3 , Al 2 O 3 , ZrO 2 , TiN and MgO.
Claim 11
Dependent Claim
34 words
A diamond coated sintered body according to claim 5, wherein the amount of component (C) is in the range of 0.2-20% by weight, based on the combined weight of components (A), (B) and (C).
Claim 12
Dependent Claim
44 words
A diamond coated sintered body according to claim 5, wherein said diamond film is formed by contacting a gas obtained by exciting a gas mixture of hydrogen gas and carbon monoxide by a microwave plasma CVD method with the surface of said sintered body.
References Cited (Backward Citations)
US4734339A
Cited
US4731296A
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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |