US4076506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transition metal carbide and boride abrasive particles
Assignee: EIDP Inc
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Filing: 1976-09-30
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Granted: 1978-02-28
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Expires: 1996-09-30
Abstract
Abstract This invention relates to abrasive particles and process for their preparation. The particles consist essentially of a matrix of titanium carbide and zirconium carbide, at least partially in solid solution form and grains of crystalline titanium diboride dispersed throughout the carbide matrix. These abrasive particles are particularly useful as components of grinding wheels for abrading steel.
Inventors
- 👤 Herbert Valdsaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/5622; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418; C22; C22C; C22C29/00; C22C29/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
Abrasive particles consisting essentially of from 69% to 94% by weight of a carbide matrix of titanium and zirconium carbide, and from 6% to 31% by weight of crystalline titanium diboride grains dispersed throughout said carbide matrix, said carbide matrix being at least partially in the form of one or more solid solutions of zirconium carbide and titanium carbide with proviso that said zirconium carbide is present in an amount of from 10% to 46% by weight, based on the total weight of the titanium and zirconium carbides and borides present.
Claim 2
Dependent Claim
91 words
Abrasive particles consisting essentially of from 69% to 94% by weight of a carbide matrix of titanium and zirconium carbide, and from 6% to 31% by weight of crystalline titanium diboride grains dispersed throughout said carbide matrix, said carbide matrix being at least partially in the form of one or more solid solutions of zirconium carbide and titanium carbide with proviso that said zirconium carbide is present in an amount of from 10% to 46% by weight, based on the total weight of the titanium and zirconium carbides and borides present.
Claim 3
Dependent Claim
47 words
Abrasive particles according to claim 1 wherein said carbide matrix is present in an amount from 75% to 90% by weight of the titanium and zirconium carbides and borides present and said crystalline titanium diboride is present in an amount of from 10% to 25% by weight.
Claim 4
Dependent Claim
30 words
Abrasive particles according to claim 1 wherein said zirconium carbide is present in an amount from 15% to 40% by weight of the titanium and zirconium carbides and borides present.
Claim 5
Dependent Claim
31 words
Abrasive particles according to claim 2 wherein said zirconium carbide is present in an amount of from 15% to 40% by weight of the titanium and zirconium carbides and borides present.
Claim 6
Dependent Claim
18 words
Abrasive particles according to claim 1 wherein said titanium diboride is present as grains of 0.5 to 30μm.
Claim 7
Dependent Claim
18 words
Abrasive particles according to claim 1 wherein said carbide matrix is present as grains of 2 to 30μm.
Claim 8
Dependent Claim
19 words
Abrasive particles according to claim 1 wherein the size of said abrasive particles is from -20 to +400 mesh.
Claim 9
Dependent Claim
19 words
Abrasive particles according to claim 1 wherein the apparent density of said abrasive particles is 4.8 to 5.3 g/cc.
Claim 10
Dependent Claim
101 words
Process for preparing the abrasive particles of claim 1 by the steps by (1) thoroughly mixing zirconium diboride and titanium carbide each predominately 1-100 μm. in maximum dimension, said titanium carbide being present in an amount in excess of the stoichiometric amount required to react with the total amount of zirconium diboride present, (2) hot-pressing the mixture of step (1) from 1 to 60 minutes at a temperature from 1900° C. to 2400° C. and at a pressure of at least 2000 psi to form a hot-pressed compact, and (3) crushing said hot-pressed compact of step (2) to form abrasive particles.
Claim 11
Dependent Claim
42 words
Process according to claim 9 wherein said mixture of step (1) is milled from 1 to 12 hours and hot-pressed from 5 to 15 minutes at a temperature from 1900° C. to 2200° C. and a pressure of at least 2000 psi.
Claim 12
Dependent Claim
29 words
Process according to claim 9 wherein said mixture of step (1) is milled from 1 to 6 hours and hot-pressed for 15 minutes at 2000° C. and 4000 psi.
Claim 13
Dependent Claim
25 words
Process according to claim 9 wherein the mixture employed in step (1) consists essentially of predetermined amounts of titanium carbide, zirconium carbide and titanium diboride.
Claim 14
Dependent Claim
23 words
In an abrasive device containing a support, bonding agent and abrasive particles, the improvement comprising using particles of the composition of claim 1.
Claim 15
Dependent Claim
15 words
The grinding wheel comprising a bond, a filler and the abrasive particles of claim 1.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |