Patent US5474583A successfully refreshed from Google Patents.
US5474583A
Expired / Lapsed
US
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Abrasive grain with metal oxide coating, method of making same and abrasive products
Assignee: 3M Co
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Filing: 1994-03-11
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Granted: 1995-12-12
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Expires: 2014-03-11
Abstract
Abstract A method of preparing preferred abrasive grain material is provided. The method involves steps of coating a non-sintered aluminum base particles with a metal alkoxide containing coating; heating to convert the coating to a metal oxide coating; and then sinter the base particles to provide sintered particles having an alpha-alumina-based core with an autogenously bonded metal oxide coating. The invention also concerns improved abrasive grain materials and abrasive products including the improved abrasive grain materials therein.
Inventors
- 👤 Ahmet Celikkaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:30
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C09K3/1445; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/1115; C04B35/117; C04B35/119; C04B35/622; C04B35/624; C04B35/626; C04B35/62605; C04B35/62625; C04B35/6264; C04B35/62645; C04B35/62655; C04B35/628; C04B35/62802; C04B35/62805; C04B35/62807; C04B35/6281; C04B35/62813; C04B35/62815; C04B35/62818; C04B35/62821; C04B35/62823; C04B35/62826; C04B35/62886; C04B35/62889; C04B35/62897; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/3218; C04B2235/327; C04B2235/3272; C04B2235/44; C04B2235/441; C04B2235/50; C04B2235/54; C04B2235/5409; C04B2235/70; C04B2235/74; C04B2235/77
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
104 words
A method of making ceramic abrasive grain, said method comprising the steps of: (a) providing a mass of particles comprising alpha-alumina precursor material each particle of which is sinterable to an alpha-alumina-based abrasive particle of said abrasive grain; (b) coating said particles with a coating composition comprising metal alkoxide to provide coated particles, said coating being capable of converting to a metal oxide coating which is autogenously bonded to the surface of each of said particles upon heating; and (c) heating said coated particles under conditions which convert said coating to a metal oxide coating and sinter said particles to provide alpha alumina-based particles.
Claim 2
Independent Claim
104 words
A method of making ceramic abrasive grain, said method comprising the steps of: (a) providing a mass of particles comprising alpha-alumina precursor material each particle of which is sinterable to an alpha-alumina-based abrasive particle of said abrasive grain; (b) coating said particles with a coating composition comprising metal alkoxide to provide coated particles, said coating being capable of converting to a metal oxide coating which is autogenously bonded to the surface of each of said particles upon heating; and (c) heating said coated particles under conditions which convert said coating to a metal oxide coating and sinter said particles to provide alpha alumina-based particles.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said coating composition also includes metal oxide modifier precursor.
Claim 4
Dependent Claim
49 words
A method according to claim 2 wherein said metal oxide modifier precursor is selected from the group consisting of salts of: magnesium; zinc; cobalt; iron; nickel; zirconium; manganese; silicon; hafnium; chromium; yttrium; praseodymium; samarium; ytterbium; neodymium; lanthanum; gadolinium; cerium; dysprosium; erbium; titanium; and mixtures of two or more thereof.
Claim 5
Dependent Claim
51 words
The method according to claim 1 wherein said metal alkoxide is selected from the group consisting of one or more alkoxides of: zirconium; titanium; aluminum; magnesium; zinc; cobalt; nickel; silicon; hafnium; iron; manganese; chromium; yttrium; praseodymium; samarium; ytterbium; neodymium; lanthanum; gadolinium; cerium; dysprosium; erbium; and mixtures of two or more thereof.
Claim 6
Dependent Claim
74 words
The method according to claim 1 wherein said metal alkoxide has a general Formula I as follows: Formula I Z.sub.x M(OR).sub.n-x wherein: M is a multivalent metal cation; n is the oxidation state of M; x is an integer having a value of 0 to n-1; OR is an alkoxy group, wherein O is oxygen; each R group is an alkyl group; and, each Z group is independently an organic group or inorganic group.
Claim 7
Dependent Claim
20 words
A method according to claim 5 wherein said metal alkoxide comprises material wherein n-x is within the range of 2-6.
Claim 8
Dependent Claim
24 words
A method according to claim 5 wherein each R group is independently a linear or branched organic group of 1 to 20 carbon atoms.
Claim 9
Dependent Claim
51 words
A method according to claim 5 wherein M is a metal cation selected from cations of metals in the group consisting of: zirconium; titanium; aluminum; magnesium; zinc; cobalt; nickel; silicon; hafnium; iron; manganese; chromium; yttrium; praseodymium; samarium; ytterbium; neodymium; lanthanum; gadolinium; cerium; dysprosium; erbium; and mixtures of two or more thereof.
Claim 10
Dependent Claim
20 words
A method according to claim 1 wherein said step of coating comprises spraying the metal alkoxide-containing coating onto said particles.
Claim 11
Independent Claim
37 words
A method according to claim wherein step (c) includes: (i) hydrolyzing said metal alkoxide coating to a coating of metal hydroxide; and (ii) heating said coating of metal hydroxide to a temperature of at least 400° C.
Claim 12
Dependent Claim
40 words
A method according to claim 1 wherein each of said particles has an outer surface, and said steps of coating and heating provides sintered coated particle particles with metal oxide coating covering at least 50% of said outer surface area.
Claim 13
Dependent Claim
16 words
A method according to claim 1 wherein said coating composition further comprises a non-polar organic solvent.
Claim 14
Dependent Claim
11 words
Ceramic abrasive grain made according to the process of claim 1.
Claim 15
Dependent Claim
58 words
Ceramic abrasive grain comprising a plurality of sintered particles, each particle comprising: (i) an alpha-alumina-based core; and, (ii) a metal oxide coating autogenously bonded to said alpha-alumina-based core; said metal oxide coating comprising randomly shaped metal oxide islands each island of which being at least about 10 micrometers in length and less than about 5 micrometers in thickness.
Claim 16
Dependent Claim
58 words
Ceramic abrasive grain comprising a plurality of sintered particles, each particle comprising: (i) an alpha-alumina-based core; and, (ii) a metal oxide coating autogenously bonded to said alpha-alumina-based core; said metal oxide coating comprising randomly shaped metal oxide islands each island of which being at least about 10 micrometers in length and less than about 5 micrometers in thickness.
Claim 17
Dependent Claim
20 words
Ceramic abrasive grain according to claim 14 including a plurality of metal oxide spheres autogenously bonded to said alpha-alumina-based core.
Claim 18
Dependent Claim
20 words
Ceramic abrasive grain according to claim 14 including a plurality of metal oxide spheres bonded to said metal oxide islands.
Claim 19
Dependent Claim
15 words
An abrasive product comprising: (a) a binder; and (b) the abrasive grain of claim 14.
Claim 20
Dependent Claim
20 words
An abrasive product according to claim 17 including a substrate to which said abrasive grain is bound by said binder.
References Cited (Backward Citations)
US1528543A
Cited
US1910444A
Cited
US2314340A
Cited
US2527044A
Cited
US3029160A
Cited
US3269815A
Cited
US4252544A
Cited
US4311489A
Cited
US4278449A
Cited
US4249913A
Cited
US4314827A
Cited
US4518397A
Cited
US4472173A
Cited
US4623364A
Cited
US4734104A
Cited
US4737163A
Cited
US4744802A
Cited
US4652275A
Cited
US4770671A
Cited
US4881951A
Cited
US5164348A
Cited
EP0293163A2
Cited
US5009674A
Cited
US5009675A
Cited
JPH0297457A
Cited
US5102429A
Cited
US5011508A
Cited
US4913708A
Cited
US4964883A
Cited
US5042991A
Cited
EP0394213A1
Cited
US4997461A
Cited
US5131923A
Cited
US5085671A
Cited
US5131926A
Cited
US5213591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |