US5100703A
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: 1990-12-07
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Granted: 1992-03-31
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Expires: 2010-12-07
Abstract
Abstract There are disclosed a diamond-coated sintered body, comprising a film or diamond and/or diamond-like carbon deposited on the surface of a sintered body of a hard phase composed mainly of a mixture of W 2 C 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
2026-10-25 22:53
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/02; C23C16/0209; C23C16/0218; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C23C16/22; C23C16/26; C23C16/27; C23C30/00; C23C30/005; Y; Y10; Y10S; Y10S427/00; Y10S427/103
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A process for preparing a diamond and/or diamond-like carbon coated sintered body excellent in adhesion strength, which comprises setting a substrate of a sintered body composed of 4% by weight or less of a binding phase mainly composed Co and/or Ni and a hard phase composed mainly of tungsten carbide as the balance and inevitable impurities in a reaction vessel, decarburizing the surface layer of said substrate by elevating the temperature within said reaction vessel with a decarburizable atmosphere comprising a gaseous mixture of hydrogen gas and a gas selected rom the group consisting of oxygen gas and an organic compound gas containing oxygen, and then coating of diamond and/or diamond-like carbon on the surface of said surface layer of said substrate and at the same time converting said surface layer to a layer composed mainly of recrystallized tungsten carbide.
Claim 2
Dependent Claim
140 words
A process for preparing a diamond and/or diamond-like carbon coated sintered body excellent in adhesion strength, which comprises setting a substrate of a sintered body composed of 4% by weight or less of a binding phase mainly composed Co and/or Ni and a hard phase composed mainly of tungsten carbide as the balance and inevitable impurities in a reaction vessel, decarburizing the surface layer of said substrate by elevating the temperature within said reaction vessel with a decarburizable atmosphere comprising a gaseous mixture of hydrogen gas and a gas selected rom the group consisting of oxygen gas and an organic compound gas containing oxygen, and then coating of diamond and/or diamond-like carbon on the surface of said surface layer of said substrate and at the same time converting said surface layer to a layer composed mainly of recrystallized tungsten carbide.
Claim 3
Dependent Claim
20 words
A process as recited in claim 1, wherein the decarburizable atmosphere is a mixture of hydrogen gas and oxygen gas.
Claim 4
Dependent Claim
25 words
A process as recited in claim 1, wherein the decarburizable atmosphere is a mixture of hydrogen gas and an organic compound gas containing oxygen gas.
Claim 5
Dependent Claim
32 words
A process as recited in claim 1, wherein the organic compound gas is selected from the group consisting of methane, ethane, propane, butane, methanol, ethanol, propanol, butanol, methyl ether and ethyl ether.
Claim 6
Dependent Claim
14 words
A process as recited in claim 4, wherein the organic compound gas is methane.
Claim 7
Dependent Claim
20 words
A process as recited in claim 1, wherein the decarburizable atmosphere comprises from 0.1 to 5% by volume of oxygen.
Claim 8
Dependent Claim
20 words
A process as recited in claim 2, wherein the decarburizable atmosphere comprises from 0.1 to 5% by volume of oxygen.
Claim 9
Dependent Claim
18 words
A process as recited in claim 1, wherein the temperature during decarburization is between 500° and 1200° C.
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) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |