US5204167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond-coated sintered body excellent in adhesion and process for preparing the same
Assignee: Tungaloy Corp
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Filing: 1991-11-29
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Granted: 1993-04-20
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Expires: 2011-11-29
Abstract
Abstract There are disclosed a diamond-coated sintered body, comprising a film of diamond and/or diamond-like carbon deposited on the surface of a sintered body of a hard phase composed mainly of a mixture of W2C and WC and inevitable impurities and a process for preparing the same.
Inventors
- 👤 Kosuke Saijo
- 👤 Masaru Yagi
- 👤 Kunio Shibuki
- 👤 Takeshi Sadahiro
- 👤 Mika Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/26; C23C16/27; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5001; C04B41/5002; C04B41/80; C04B41/81; C04B41/85; C23C16/02; C23C16/0209; C23C16/0218; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A diamond-coated sintered body having excellent adhesion strength, comprising a film of diamond and/or diamond-like carbon deposited on a surface of a substrate, wherein: said substrate comprises a sintered body of a hard-phase composed mainly of tungsten carbide, and said surface of said substrate comprises recrystallized tungsten carbide in the surface layer to at most 10 microns toward the inner portion from the surface of said substrate in which the average grain size of the recrystallized tungsten carbide in the surface layer is finer than the average grain size of the tungsten carbide in the inner portion of the substrate excluding the surface layer.
Claim 2
Dependent Claim
104 words
A diamond-coated sintered body having excellent adhesion strength, comprising a film of diamond and/or diamond-like carbon deposited on a surface of a substrate, wherein: said substrate comprises a sintered body of a hard-phase composed mainly of tungsten carbide, and said surface of said substrate comprises recrystallized tungsten carbide in the surface layer to at most 10 microns toward the inner portion from the surface of said substrate in which the average grain size of the recrystallized tungsten carbide in the surface layer is finer than the average grain size of the tungsten carbide in the inner portion of the substrate excluding the surface layer.
Claim 3
Dependent Claim
22 words
A diamond-coated sintered body as claimed in claim 1, wherein said hard phase comprises 50% by volume or more of tungsten carbide.
Claim 4
Dependent Claim
28 words
A diamond-coated sintered body as claimed in claim 1, wherein said tungsten carbide comprises 75% by weight or less of W 2 C and the balance of WC.
Claim 5
Dependent Claim
137 words
A diamond-coated sintered body having excellent adhesion strength, comprising a film of diamond and/or diamond-like carbon deposited on a surface of a substrate, wherein: the substrate comprises a sintered body of a hard-phase consisting essentially of tungsten carbide and recrystallized tungsten carbide in the surface layer to at most 10 microns toward the inner portion from the surface of the substrate in which the average grain size of the recrystallized tungsten carbide in the surface layer is finer than the average grain size of the tungsten carbide in the inner portion of the substrate excluding the surface layer, and the diamond coated sintered body has a half value width of X-ray diffraction line at the WC (100) face with the CR-Kα line through the surface of the coated film being 0.2° to 0.4° in terms of 2Θ.
Claim 6
Dependent Claim
137 words
A diamond-coated sintered body having excellent adhesion strength, comprising a film of diamond and/or diamond-like carbon deposited on a surface of a substrate, wherein: the substrate comprises a sintered body of a hard-phase consisting essentially of tungsten carbide and recrystallized tungsten carbide in the surface layer to at most 10 microns toward the inner portion from the surface of the substrate in which the average grain size of the recrystallized tungsten carbide in the surface layer is finer than the average grain size of the tungsten carbide in the inner portion of the substrate excluding the surface layer, and the diamond coated sintered body has a half value width of X-ray diffraction line at the WC (100) face with the CR-Kα line through the surface of the coated film being 0.2° to 0.4° in terms of 2Θ.
Claim 7
Dependent Claim
22 words
A diamond-coated sintered body as claimed in claim 4, wherein the hard phase comprises 50% by volume or more of tungsten carbide.
Claim 8
Dependent Claim
28 words
A diamond-coated sintered body as claimed in claim 4, wherein the tungsten carbide comprises 75% by volume or less of W 2 C and the balance of WC.
Claim 9
Dependent Claim
127 words
A diamond-coated sintered body having excellent adhesion strength comprising a film of diamond and/or diamond-like carbon deposited on a surface of a substrate, wherein the substrate comprises: a sintered body having 4% or less by weight of a binding phase consisting essentially of at least one metal selected from the group consisting of Co and Ni and the balance of a hard phase consisting essentially of tungsten carbide, and recrystallized tungsten carbide in the surface layer to at most 10 microns toward the inner portion from the surface of the substrate in which the average grain size of recrystallized tungsten carbide in the surface layer is finer than the average grain size of the tungsten carbide in the inner portion of the substrate excluding the surface layer.
Claim 10
Dependent Claim
127 words
A diamond-coated sintered body having excellent adhesion strength comprising a film of diamond and/or diamond-like carbon deposited on a surface of a substrate, wherein the substrate comprises: a sintered body having 4% or less by weight of a binding phase consisting essentially of at least one metal selected from the group consisting of Co and Ni and the balance of a hard phase consisting essentially of tungsten carbide, and recrystallized tungsten carbide in the surface layer to at most 10 microns toward the inner portion from the surface of the substrate in which the average grain size of recrystallized tungsten carbide in the surface layer is finer than the average grain size of the tungsten carbide in the inner portion of the substrate excluding the surface layer.
Claim 11
Dependent Claim
22 words
A diamond-coated sintered body as claimed in claim 7, wherein said hard phase comprises 50% by volume or more of tungsten carbide.
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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) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |