US4142872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal bonded abrasive tools
Assignee: Individual
•
Filing: 1978-01-09
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Granted: 1979-03-06
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Expires: 1998-01-09
Abstract
Abstract A metal bonded abrasive body comprising diamond or cubic boron nitride abrasive particles held in a metal bonding matrix, the metal bonding matrix consisting of cobalt, present in an amount of at least 50 percent by weight of the matrix, and boron in the form of cobalt borides substantially uniformly distributed through the matrix. The invention also provides for a method of producing such bodies which includes mixing cobalt or a cobalt alloy, in powder form, with diamond or cubic boron nitride particles and sintering the mixture to produce the body and is characterized in that the cobalt or alloy powder is mixed with a boriding powder and sintered at a temperature of 800° C. to 1000° C. to boride the cobalt, the boriding taking place before or during the body-forming sintering step.
Inventors
- 👤 Victor R. Conradi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:32
CPC Classifications
C; C22; C22C; C22C26/00; B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/08; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831; C22C2026/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A metal bonded abrasive body comprising diamond or cubic boron nitride abrasive particles, present in an amount of 5 to 15 percent by volume of the body, held in a metal bonding matrix, the metal bonding matrix consisting of cobalt, present in an amount of at least 50 percent by weight of the matrix, and boron in the form of cobalt borides substantially uniformly distributed through the matrix.
Claim 2
Dependent Claim
68 words
A metal bonded abrasive body comprising diamond or cubic boron nitride abrasive particles, present in an amount of 5 to 15 percent by volume of the body, held in a metal bonding matrix, the metal bonding matrix consisting of cobalt, present in an amount of at least 50 percent by weight of the matrix, and boron in the form of cobalt borides substantially uniformly distributed through the matrix.
Claim 3
Dependent Claim
24 words
A body according to claim 1 wherein the metal bonding matrix consists substantially only of cobalt and boron in the form of cobalt borides.
Claim 4
Dependent Claim
24 words
A body according to claim 1 wherein the boron is present in an amount of 0.5 to 3 percent by weight of the matrix.
Claim 5
Dependent Claim
24 words
A body according to claim 2 wherein the boron is present in an amount of 0.5 to 3 percent by weight of the matrix.
Claim 6
Dependent Claim
15 words
A body according to claim 1 wherein the abrasive particles are predominantly synthetic diamond particles.
Claim 7
Dependent Claim
80 words
A method of making a metal bonded abrasive body of claim 1 including the steps of mixing cobalt or a cobalt alloy, in powder form, with diamond or cubic boron nitride particles and sintering the mixture to produce the body characterised in that the cobalt or alloy powder is mixed with a boriding powder and sintered at a temperature of 800° C. to 1000° C. to boride the cobalt, the boriding taking place before or during the body-forming sintering step.
Claim 8
Dependent Claim
20 words
A method of claim 6 wherein the boriding powder is boron carbide alone or in admixture with another boron-containing compound.
Claim 9
Dependent Claim
21 words
A method of claim 6 wherein the cobalt or alloy powder is borided before it is mixed with the abrasive particles.
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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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |