Patent US5641330A successfully refreshed from Google Patents.
US5641330A
Expired / Lapsed
US
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Method of making alumina abrasive grain having a metal nitride coating thereon
Assignee: 3M Co
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Filing: 1995-11-28
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Granted: 1997-06-24
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Expires: 2015-11-28
Abstract
Abstract Method for providing alpha alumina-based abrasive grain having metal nitride on at least a portion of the outer surface thereof. The abrasive grain can be incorporated into a variety of abrasive products including bonded abrasive, nonwoven abrasive, and coated abrasive products.
Inventors
- 👤 Ahmet Celikkaya
- 👤 Gregory D. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:40
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/1115
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
62 words
A method for making an alpha alumina-based abrasive grain, said method comprising heating a plurality of alpha alumina-based abrasive particles each having an outer surface including metal oxide, in the presence of a carbon source, for a time, at a temperature, and under a non-oxidizing, nitrogen containing atmosphere, sufficient to convert at least a portion of said metal oxide to metal nitride.
Claim 2
Independent Claim
62 words
A method for making an alpha alumina-based abrasive grain, said method comprising heating a plurality of alpha alumina-based abrasive particles each having an outer surface including metal oxide, in the presence of a carbon source, for a time, at a temperature, and under a non-oxidizing, nitrogen containing atmosphere, sufficient to convert at least a portion of said metal oxide to metal nitride.
Claim 3
Dependent Claim
15 words
The method according to claim 1, wherein said carbon source is a particulate carbon source.
Claim 4
Dependent Claim
44 words
The method according to claim 2, wherein at least a portion of said alpha alumina-based abrasive particles each comprise an alpha alumina-based core having an outer surface and a metal oxide coating covering at least a portion of said outer surface of said core.
Claim 5
Dependent Claim
25 words
The method according to claim 3, wherein said metal oxide coating has an average thickness in the range from about 0.1 to about 20 micrometers.
Claim 6
Dependent Claim
15 words
The method according to claim 3, wherein said metal oxide coating comprises metal oxide particulate.
Claim 7
Dependent Claim
22 words
The method according to claim 5, wherein said metal oxide coating covers at least 70% of said outer surface of said core.
Claim 8
Dependent Claim
22 words
The method according to claim 5, wherein said coating has a thickness in the range from about 0.1 to about 20 micrometers.
Claim 9
Dependent Claim
21 words
The method according to claim 5, wherein said metal oxide particulate is autogenously bonded to said outer surface of said core.
Claim 10
Dependent Claim
22 words
The method according to claim 3, wherein said metal oxide coating covers at least 70% of said outer surface of said core.
Claim 11
Dependent Claim
33 words
The method according to claim 3, wherein said metal oxide coating is selected from the group consisting of oxides of titanium, zirconium, aluminum, boron, chromium, silicon, vanadium, tantalum, hafnium, niobium, and combinations thereof.
Claim 12
Dependent Claim
24 words
The method according to claim 2, wherein at least a portion of said alpha alumina-based abrasive particles are sintered, polycrystalline alpha alumina-based ceramic particles.
Claim 13
Dependent Claim
45 words
The method according to claim 2, wherein at least a portion of said abrasive particles each comprise a sintered, polycrystalline alpha alumina-based ceramic core having an outer surface and a metal oxide coating covering at least a portion of said outer surface of said core.
Claim 14
Dependent Claim
34 words
The method according to claim 12, wherein said metal oxide coating is selected from the group consisting of the oxides of titanium, zirconium, aluminum, chromium, boron, silicon, vanadium, tantalum, hafnium, niobium, and combinations thereof.
Claim 15
Dependent Claim
22 words
The method according to claim 12, wherein said metal oxide coating covers at least 70% of said outer surface of said core.
Claim 16
Dependent Claim
14 words
The method according to claim 2, wherein said particulate carbon source is graphite powder.
Claim 17
Dependent Claim
14 words
The method according to claim 2, wherein said particulate carbon source is carbon powder.
Claim 18
Dependent Claim
20 words
The method according to claim 2, wherein said atmosphere is selected from the group consisting of nitrogen, ammonium, and combinations.
Claim 19
Dependent Claim
23 words
The method according to claim 1, wherein said carbon source is a carbonaceous material present on said outer surface of said abrasive particles.
Claim 20
Dependent Claim
23 words
The method according to claim 1, wherein said carbon source is cured phenolic resin present on said outer surface of said abrasive particles.
Claim 21
Independent Claim
97 words
A method of making an abrasive article, said method comprising the steps of: (a) heating a plurality of alpha alumina-based abrasive particles, each having an outer surface including metal oxide, in the presence of a carbon source, for a time, at a temperature, and under a non-oxidizing nitrogen containing atmosphere, sufficient to convert at least a portion of said metal oxide to metal nitride to provide a plurality of abrasive grain having an outer surface at least of portion of which comprises metal nitride; and (b) combining said abrasive grain with binder to provide an abrasive article.
Claim 22
Independent Claim
97 words
A method of making an abrasive article, said method comprising the steps of: (a) heating a plurality of alpha alumina-based abrasive particles, each having an outer surface including metal oxide, in the presence of a carbon source, for a time, at a temperature, and under a non-oxidizing nitrogen containing atmosphere, sufficient to convert at least a portion of said metal oxide to metal nitride to provide a plurality of abrasive grain having an outer surface at least of portion of which comprises metal nitride; and (b) combining said abrasive grain with binder to provide an abrasive article.
Claim 23
Dependent Claim
18 words
The method of making an abrasive article according to claim 20 wherein said binder is an organic binder.
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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) | 2000-06-23 | 2000-12-23 | 2001-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-23 | 2004-12-23 | 2005-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-23 | 2008-12-23 | 2009-06-24 | $7700.00 | Window Closed / Lapsed |