US4684405A
Expired / Lapsed
US
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Sintered tungsten carbide material and manufacturing method
Assignee: Fried Krupp AG
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Filing: 1986-03-28
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Granted: 1987-08-04
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Expires: 2006-03-28
Abstract
Abstract A sintered tungsten carbide material and method for manufacturing same in which the method includes the steps of combining metal particles composed of from 75 to 95 percent by weight of a composition containing at least 70 percent by weight of tungsten carbide and from 5 to 25 percent by weight of a binder metal composition, the binder metal composition consisting essentially of from 5 to 15 percent by weight of chromium and from 85 to 95 percent by weight of nickel; pressing the metal particles into a pressed body; sintering the pressed body in a sintering chamber for a period ranging from 20 to 200 minutes, at a temperature ranging from 1400° to 1500° C., and in a protective atmosphere which is one of a vacuum, a noble gas, a mixture of noble gases, and hydrogen gas to form a sintered body; and treating the sintered body for a period ranging from 20 to 200 minutes, at a temperature ranging from 1300° to 1400° C., at a pressure ranging from 20 to 3000 bar, and in a noble gas atmosphere. The pressure/temperature treatment step densifies the sintered composition and results in an unexpectedly stronger and tougher sintered metal.
Inventors
- 👤 Johannes Kolaska
- 👤 Norbert Reiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:02
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; C22C29/067; B; B22; B22F; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A method for manufacturing a sintered tungsten carbide material, comprising: combining metal particles composed of: from 75 to 95 percent by weight of a composition containing at least 70 percent by weight of tungsten carbide; and from 5 to 25 percent by weight of a binder metal composition, the binder metal composition consisting essentially of from 5 to 15 percent by weight of chromium and from 85 to 95 percent by weight of nickel; pressing the metal particles into a pressed body; sintering the pressed body in a sintering chamber for a period ranging from 20 to 200 minutes, at a temperature ranging from 1400° to 1500° C., and in a protective atmosphere which is one of a vacuum, a noble gas, a mixture of noble gases, and hydrogen gas to form a sintered body; and treating the sintered body for a period ranging from 20 to 200 minutes, at a temperature ranging from 1300° to 1400° C., at a pressure ranging from 20 to 3000 bar, and in a noble gas atmosphere.
Claim 2
Independent Claim
173 words
A method for manufacturing a sintered tungsten carbide material, comprising: combining metal particles composed of: from 75 to 95 percent by weight of a composition containing at least 70 percent by weight of tungsten carbide; and from 5 to 25 percent by weight of a binder metal composition, the binder metal composition consisting essentially of from 5 to 15 percent by weight of chromium and from 85 to 95 percent by weight of nickel; pressing the metal particles into a pressed body; sintering the pressed body in a sintering chamber for a period ranging from 20 to 200 minutes, at a temperature ranging from 1400° to 1500° C., and in a protective atmosphere which is one of a vacuum, a noble gas, a mixture of noble gases, and hydrogen gas to form a sintered body; and treating the sintered body for a period ranging from 20 to 200 minutes, at a temperature ranging from 1300° to 1400° C., at a pressure ranging from 20 to 3000 bar, and in a noble gas atmosphere.
Claim 3
Dependent Claim
48 words
The method according to claim 1, including the further step of cooling the sintered body prior to the treating step, and wherein the treating step is conducted in a treating chamber which is separate from the sintering chamber and at a pressure ranging from 100 to 3000 bar.
Claim 4
Dependent Claim
27 words
The method according to claim 1, wherein the treating step immediately follows the sintering step and is conducted at a pressure ranging from 20 to 100 bar.
Claim 5
Dependent Claim
50 words
The method according to claim 1, wherein the tungsten carbide composition consists essentially of from 1 to 30 percent by weight of a compound selected from the group consisting of titanium carbide, tantalum carbide, niobium carbide and mixtures thereof, and from 70 to 99 percent by weight of tungsten carbide.
Claim 6
Dependent Claim
19 words
The method according to claim 1, wherein the noble gas atmosphere for the treating step is an argon atmosphere.
Claim 7
Dependent Claim
173 words
A sintered tungsten carbide material prepared by a method comprising: combining metal particles composed of: from 75 to 95 percent by weight of a composition containing at least 70 percent by weight of tungsten carbide; and from 5 to 25 percent by weight of a binder metal composition, the binder metal composition consisting essentially of from 5 to 15 percent by weight of chromium and from 85 to 95 percent by weight of nickel; pressing the metal particles into a pressed body; sintering the pressed body in a sintering chamber for a period ranging from 20 to 200 minutes, at a temperature ranging from 1400° to 1500° C., and in a protective atmosphere which is one of a vacuum, a noble gas, a mixture of noble gases, and hydrogen gas to form a sintered body; and treating the sintered body for a period ranging from 20 to 200 minutes, at a temperature ranging from 1300° to 1400° C., at a pressure ranging from 20 to 3000 bar, and in a noble gas atmosphere.
Claim 8
Dependent Claim
173 words
A sintered tungsten carbide material prepared by a method comprising: combining metal particles composed of: from 75 to 95 percent by weight of a composition containing at least 70 percent by weight of tungsten carbide; and from 5 to 25 percent by weight of a binder metal composition, the binder metal composition consisting essentially of from 5 to 15 percent by weight of chromium and from 85 to 95 percent by weight of nickel; pressing the metal particles into a pressed body; sintering the pressed body in a sintering chamber for a period ranging from 20 to 200 minutes, at a temperature ranging from 1400° to 1500° C., and in a protective atmosphere which is one of a vacuum, a noble gas, a mixture of noble gases, and hydrogen gas to form a sintered body; and treating the sintered body for a period ranging from 20 to 200 minutes, at a temperature ranging from 1300° to 1400° C., at a pressure ranging from 20 to 3000 bar, and in a noble gas atmosphere.
Claim 9
Dependent Claim
55 words
The sintered tungsten carbide material prepared by the method according to claim 6, including the further step of cooling the sintered body prior to the treating step, and wherein the treating step is conducted in a treating chamber which is separate from the sintering chamber and at a pressure ranging from 100 to 3000 bar.
Claim 10
Dependent Claim
34 words
The sintered tungsten carbide material prepared by the method according to claim 6, wherein the treating step immediately follows the sintering step and is conducted at a pressure ranging from 20 to 100 bar.
Claim 11
Dependent Claim
57 words
The sintered tungsten carbide material prepared by the method according to claim 6, wherein the tungsten carbide composition consists essentially of from 1 to 30 percent by weight of a compound selected from the group consisting of titanium carbide, tantalum carbide, niobium carbide and mixtures thereof, and from 70 to 99 percent by weight of tungsten carbide.
Claim 12
Dependent Claim
26 words
The sintered tungsten carbide material prepared by the method according to claim 6, wherein the noble gas atmosphere for the treating step is an argon atmosphere.
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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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |