US5348760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treated ceramic powders
Assignee: Alcoa Corp
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Filing: 1993-10-12
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Granted: 1994-09-20
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Expires: 2013-10-12
Abstract
Abstract A method of reducing the agglomeration of ceramic powder materials, the method comprising: (a) providing a ceramic powder comprising ceramic particles; (b) coating the ceramic particles with a solution containing from 0.05-0.5 wt. % of a polysiloxanol oligomer of a trialkoxysiloxane monomer having the structure Si(OR')3 wherein R' represents a lower C1-C4 alkoxy group selected from the group consisting of methoxy, ethoxy, isopropoxy and n-butoxy and wherein the oligomer has chains having a number average distribution with a number average degree of polymerization Xn in the range above 2 but below that near the gel point; and (c) drying the ceramic powder.
Inventors
- 👤 Anthony A. Parker
- 👤 Edward M. Anderson
- 👤 Todd T. Stanzione
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:19
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63448; B; B01; B01J; B01J2/00; B01J2/30; C04B35/62605; C04B35/62645; C04B35/62655; C04B35/628; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/3222; C04B2235/3231; C04B2235/3232; C04B2235/3234; C04B2235/3236; C04B2235/3241; C04B2235/3244; C04B2235/3248; C04B2235/34; C04B2235/3427; C04B2235/3436; C04B2235/3445; C04B2235/3463; C04B2235/3481; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/60; C04B2235/608
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
94 words
A method of reducing the agglomeration of ceramic powder materials, the method comprising: (a) providing a ceramic powder comprising ceramic particles; (b) coating said ceramic particles with an oligomer of a trialkoxysiloxane having the structure Si(OR').sub.3 wherein R' represents a lower C 1 -C 4 alkoxy group selected from the group consisting of methoxy, ethoxy, isopropoxy and n-butoxy; and, wherein said oligomer has chains having a number average distribution with a number average degree of polymerization X n in the range above 2 but below the gel point; and (c) drying said ceramic powder.
Claim 2
Independent Claim
94 words
A method of reducing the agglomeration of ceramic powder materials, the method comprising: (a) providing a ceramic powder comprising ceramic particles; (b) coating said ceramic particles with an oligomer of a trialkoxysiloxane having the structure Si(OR').sub.3 wherein R' represents a lower C 1 -C 4 alkoxy group selected from the group consisting of methoxy, ethoxy, isopropoxy and n-butoxy; and, wherein said oligomer has chains having a number average distribution with a number average degree of polymerization X n in the range above 2 but below the gel point; and (c) drying said ceramic powder.
Claim 3
Dependent Claim
31 words
The method of claim 1 in which said chains have a number average distribution with a number average degree of polymerization X n in the range from about 3 to 10.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which said oligomer is pre-hydrolyzed n-octyltriethoxysilane.
Claim 5
Dependent Claim
29 words
The method of claim 1 in which said oligomer is present in an amount in the range from about 0.005 to about 5 wt. % of said ceramic powder.
Claim 6
Dependent Claim
29 words
The method of claim 1 in which said oligomer is present in an amount in the range from about 0.05 to about 2 wt. % of said ceramic powder.
Claim 7
Dependent Claim
37 words
The method of claim 1 in which ceramic particles are selected from the group consisting of alumina, chromia, aluminum silicate, cordierite, mullite, spinel, forsterite, barium titanate, magnesium silicate, steatite, titanium dioxide, zircon, zirconium dioxide, and combinations thereof.
Claim 8
Dependent Claim
21 words
The method of claim 1 in which said drying is performed at a temperature between about 40° C. and 200° C.
Claim 9
Dependent Claim
20 words
The method of claim 1 in which said drying is performed with agitation at a temperature greater than ambient temperature.
Claim 10
Dependent Claim
19 words
The method of claim 1 in which said drying is performed at a temperature greater than about 100° C.
Claim 11
Dependent Claim
25 words
The method of claim 1 in which said coating of ceramic particles is performed by: adding said oligomer to said ceramic particles and dry mixing.
Claim 12
Dependent Claim
39 words
The method of claim 1 in which said coating of ceramic particles is performed by: determining the amount needed to provide a monolayer coverage of the ceramic particles; and adding said oligomer to said ceramic particles and dry mixing.
Claim 13
Dependent Claim
25 words
The method of claim 1 in which (a) includes providing a ceramic powder having at least 50% of its particles less than about 10 μm.
Claim 14
Dependent Claim
18 words
The method of claim 1 which further includes: (d) incorporating said dried ceramic particles to a ceramic slurry.
Claim 15
Dependent Claim
33 words
The method of claim 1 which further includes: (d) incorporating said dried ceramic particles to a ceramic slurry formed from a solvent selected from the group consisting of water, ethanol, toluene and methanol.
Claim 16
Dependent Claim
28 words
The method of claim 1 which further includes: (d) incorporating said dried ceramic particles to a ceramic slurry; and (e) forming said slurry into a green ceramic body.
Claim 17
Dependent Claim
49 words
The method of claim 1 which further includes: (d) incorporating said dried ceramic particles to a ceramic slurry; and (e) forming said slurry into a green ceramic body by a method selected from the group comprising extrusion, pressing, wet pressing, jiggering, ram pressing, injection molding, casting and doctor blading.
Claim 18
Independent Claim
106 words
A method of reducing the agglomeration of ceramic powder materials, the method comprising: (a) providing a ceramic powder comprising ceramic particles; (b) coating said ceramic particles with a polysiloxanol oligomer of a trialkoxysiloxane monomer having the structure Si(OR').sub.3 wherein R' represents a lower C 1 -C 4 alkoxy group selected from the group consisting of methoxy, ethoxy, isopropoxy and n-butoxy; and, wherein said oligomer has chains having a number average distribution with a number average degree of polymerization X n in the range above 2 but below the gel point; (c) drying said ceramic powder; and (d) incorporating said dried ceramic powder to a ceramic slurry.
Claim 19
Independent Claim
106 words
A method of reducing the agglomeration of ceramic powder materials, the method comprising: (a) providing a ceramic powder comprising ceramic particles; (b) coating said ceramic particles with a polysiloxanol oligomer of a trialkoxysiloxane monomer having the structure Si(OR').sub.3 wherein R' represents a lower C 1 -C 4 alkoxy group selected from the group consisting of methoxy, ethoxy, isopropoxy and n-butoxy; and, wherein said oligomer has chains having a number average distribution with a number average degree of polymerization X n in the range above 2 but below the gel point; (c) drying said ceramic powder; and (d) incorporating said dried ceramic powder to a ceramic slurry.
Claim 20
Dependent Claim
17 words
The method of claim 17 which further includes: (e) forming said slurry into a green ceramic body.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |