US4626281A
Expired / Lapsed
US
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Hard metal composition
Assignee: United States, AS REPRESENTED BY US DEPARTMENT OF ENERGY
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Filing: 1985-05-07
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Granted: 1986-12-02
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Expires: 2005-05-07
Abstract
Abstract A composition of matter having a Rockwell A hardness of at least 85 is formed from a precursor mixture comprising between 3 and 10 weight percent boron carbide and the remainder a metal mixture comprising from 70 to 90 percent tungsten or molybdenum, with the remainder of the metal mixture comprising nickel and iron or a mixture thereof. The composition has a relatively low density of between 7 to 14 g/cc. The precursor is preferably hot pressed to yield a composition having greater than 100% of theoretical density.
Inventors
- 👤 Haskell Sheinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:23
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052; C22C32/0057; C22C27/00; C22C27/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
374 words
A hard composition of matter having a Rockwell A hardness value of at least approximately 85, comprising the compressed and densified reaction product of: a minor amount of a boron carbide component selected from the group consisting of (a) boron carbide and (b) boron and carbon, the boron and carbon being present in amounts sufficient to form boron carbide in situ, wherein said boron carbide component consists essentially of B 4 C; a major amount of a metal mixture consisting essentially of: (a) a first metal component selected from the group consisting of tungsten and molybdenum and mixtures thereof, and (b) a second metal component selected from the group consisting of nickel and iron and mixtures thereof; wherein said minor amount of said boron carbide component is between 3% and 6% by weight of said composition of matter when said first metal component is tungsten, said minor amount of said boron carbide component is between 6% and 10% by weight of said composition when said first metal component is molybdenum, and said boron carbide component is between 3% and 10% when said first metal component is a mixture of tungsten and molybdenum, with the remainder of the composition being formed of said metal mixture; and wherein said first metal component is from 70% to less than about 90% by weight of said metal mixture when said first metal component is tungsten, and wherein said first metal component is from 72% to less than about 90% by weight of said metal mixture when said first metal component is molybdenum; with the remainder of said metal mixture in each case being formed of said second metal component, and wherein for hard compositions of matter with similar Rockwell A hardness properties when one unmixed said first metal component is totally substituted for the other unmixed said first metal component, the ratio of the moles of the unmixed first metal component to moles of boron carbide is held constant; and wherein for hard compositions of matter with similar Rockwell A hardness properties when said first metal component is a mixture of tungsten and molybdenum, the sum of the number of moles of tungsten and molybdenum is held constant with respect to the number of moles of boron carbide.
Claim 2
Dependent Claim
374 words
A hard composition of matter having a Rockwell A hardness value of at least approximately 85, comprising the compressed and densified reaction product of: a minor amount of a boron carbide component selected from the group consisting of (a) boron carbide and (b) boron and carbon, the boron and carbon being present in amounts sufficient to form boron carbide in situ, wherein said boron carbide component consists essentially of B 4 C; a major amount of a metal mixture consisting essentially of: (a) a first metal component selected from the group consisting of tungsten and molybdenum and mixtures thereof, and (b) a second metal component selected from the group consisting of nickel and iron and mixtures thereof; wherein said minor amount of said boron carbide component is between 3% and 6% by weight of said composition of matter when said first metal component is tungsten, said minor amount of said boron carbide component is between 6% and 10% by weight of said composition when said first metal component is molybdenum, and said boron carbide component is between 3% and 10% when said first metal component is a mixture of tungsten and molybdenum, with the remainder of the composition being formed of said metal mixture; and wherein said first metal component is from 70% to less than about 90% by weight of said metal mixture when said first metal component is tungsten, and wherein said first metal component is from 72% to less than about 90% by weight of said metal mixture when said first metal component is molybdenum; with the remainder of said metal mixture in each case being formed of said second metal component, and wherein for hard compositions of matter with similar Rockwell A hardness properties when one unmixed said first metal component is totally substituted for the other unmixed said first metal component, the ratio of the moles of the unmixed first metal component to moles of boron carbide is held constant; and wherein for hard compositions of matter with similar Rockwell A hardness properties when said first metal component is a mixture of tungsten and molybdenum, the sum of the number of moles of tungsten and molybdenum is held constant with respect to the number of moles of boron carbide.
Claim 3
Dependent Claim
141 words
The composition of matter defined in claim 1 wherein said second metal component of said metal mixture consists of nickel in an amount of between 10% to 21% by weight of said metal mixture, and iron in an amount of between 0% and 9% of said metal mixture, and with the total of said iron and nickel amounts being not greater than 30% by weight of said metal mixture, when said first metal component is tungsten; and wherein said second metal component consists of nickel in an amount of between 9% and 20% by weight of said metal mixture, and iron in an amount of between 0% and 9% of said metal mixture, and with the total of said nickel and iron amounts being not greater than 28% by weight of said metal mixture, when said first metal component is molybdenum.
Claim 4
Dependent Claim
21 words
The composition of matter defined in claim 2 wherein said second metal component of said metal mixture consists essentially of nickel.
Claim 5
Dependent Claim
370 words
A precursor mixture useful for forming a composition of matter having a Rockwell hardness of at least approximately 85, comprising: a minor amount of a boron carbide component selected from the group consisting of (a) boron carbide and (b) boron and carbon, the boron and carbon being present in amounts sufficient to form boron carbide in situ, wherein said boron carbide component consists essentially of B 4 C; a major amount of a metal mixture consisting essentially of: (a) a first metal component selected from the group consisting of tungsten and molybdenum and mixtures thereof; and (b) a second metal component selected from the group consisting of nickel and iron and mixtures thereof; wherein said minor amount of said boron carbide component is between 3% and 6% by weight of said composition of matter when said first metal component is tungsten, said minor amount of said boron carbide component is between 6% and 10% by weight of said composition when said first metal component is molybdenum, and said boron carbide component is between 3% and 10% when said first metal component is a mixture of tungsten and molybdenum, with the remainder of the composition being formed of said metal mixture; and wherein said first metal component is from 70% to less than about 90% by weight of said metal mixture when said first metal component is tungsten, and wherein said first metal component is from 72% to less than about 90% by weight of said metal mixture when said first metal component is molybdenum; with the remainder of said metal mixture in each case being formed of said second metal component, and wherein for hard compositions of matter with similar Rockwell A hardness properties when one unmixed said first metal component is totally substituted for the other unmixed said first metal component, the ratio of the moles of the unmixed first metal component to moles of boron carbide is held constant; and wherein for hard compositions of matter with similar Rockwell A hardness properties when said first metal component is a mixture of tungsten and molybdenum, the sum of the number of moles of tungsten and molybdenum is held constant with respect to the number of moles of boron carbide.
Claim 6
Dependent Claim
370 words
A precursor mixture useful for forming a composition of matter having a Rockwell hardness of at least approximately 85, comprising: a minor amount of a boron carbide component selected from the group consisting of (a) boron carbide and (b) boron and carbon, the boron and carbon being present in amounts sufficient to form boron carbide in situ, wherein said boron carbide component consists essentially of B 4 C; a major amount of a metal mixture consisting essentially of: (a) a first metal component selected from the group consisting of tungsten and molybdenum and mixtures thereof; and (b) a second metal component selected from the group consisting of nickel and iron and mixtures thereof; wherein said minor amount of said boron carbide component is between 3% and 6% by weight of said composition of matter when said first metal component is tungsten, said minor amount of said boron carbide component is between 6% and 10% by weight of said composition when said first metal component is molybdenum, and said boron carbide component is between 3% and 10% when said first metal component is a mixture of tungsten and molybdenum, with the remainder of the composition being formed of said metal mixture; and wherein said first metal component is from 70% to less than about 90% by weight of said metal mixture when said first metal component is tungsten, and wherein said first metal component is from 72% to less than about 90% by weight of said metal mixture when said first metal component is molybdenum; with the remainder of said metal mixture in each case being formed of said second metal component, and wherein for hard compositions of matter with similar Rockwell A hardness properties when one unmixed said first metal component is totally substituted for the other unmixed said first metal component, the ratio of the moles of the unmixed first metal component to moles of boron carbide is held constant; and wherein for hard compositions of matter with similar Rockwell A hardness properties when said first metal component is a mixture of tungsten and molybdenum, the sum of the number of moles of tungsten and molybdenum is held constant with respect to the number of moles of boron carbide.
Claim 7
Dependent Claim
140 words
The precursor mixture defined in claim 4 wherein said second metal component of said metal mixture consists of nickel in an amount of between 10% to 21% by weight of said metal mixture, and iron in an amount of between 0% and 9% of said metal mixture, and with the total of said nickel and iron amounts being not greater than 30% by weight of said metal mixture, when said first metal component is tungsten; and wherein said second metal component consists of nickel in an amount of between 9% and 20% by weight of said metal mixture, and iron in an amount of between 0% and 9% of said metal mixture, and with the total of said iron and nickel amounts being not greater than 28% by weight of said metal mixture, when said first metal component is molybdenum.
Claim 8
Dependent Claim
20 words
The precursor mixture defined in claim 4 wherein said second metal component of said metal mixture consists essentially of nickel.
References Cited (Backward Citations)
US21730A
Cited
USRE21730E
Cited
US2200258A
Cited
US2916809A
Cited
US3367398A
Cited
US3386812A
Cited
US3672936A
Cited
US4212670A
Cited
US4400213A
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |