US5147829A
Expired / Lapsed
US
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Sol-gel derived SiO2 /oxide power composites and their production
Assignee: GRYPHON VENTURES II LP
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Filing: 1989-04-19
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Granted: 1992-09-15
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Expires: 2009-04-19
Abstract
Abstract A SiO 2 /oxide powder composite made by preparing a sol containing SiO 2 and optionally Al 2 O 3 , Li 2 O, Na 2 O, TiO 2 , B 2 O 3 and mixtures thereof with oxide powder consisting of SiO 2 , Al 2 O 3 , ZrO 2 , TiO 2 , Li 2 O-TiO 2 , Li 2 O-Al 2 O 3 -TiO 2 , β spodumene crystals, β eucryptite crystals, aluminum titanate, 68 SiO 2 -21.4 Al 2 O 3 -5.7 TiO 2 -3.8 Li 2 O (mole %) and mixtures thereof having a size from about 10 microns to about 0.001 micron dispersed therein, gelling the sol to produce a monolithic SiO 2 gel matrix having homogeneously distributed therein the oxide powder, and drying the monolithic SiO 2 gel/oxide powder composite.
Inventors
- 👤 Larry L. Hench
- 👤 Soon C. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:15
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/004; B; B01; B01J; B01J13/00; B01J13/0091; C03C2214/00; C03C2214/04; C03C2214/32; Y; Y10; Y10S; Y10S516/00; Y10S516/922; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
92 words
A method of making a SiO 2 gel/oxide powder composite comprising the steps of: (1) preparing a sol containing SiO 2 with oxide powder dispersed therein in the presence of a drying control chemical additive, (2) gelling the sol to produce a monolithic SiO 2 gel matrix having homogeneously distributed therein the oxide powder, and (3) drying the monolithic SiO 2 gel/oxide powder composite, wherein the dried gel matrix of the composite is crack-free and has a surface area in the range of 600 m 2 /g to 1100 m 2 /g.
Claim 2
Independent Claim
92 words
A method of making a SiO 2 gel/oxide powder composite comprising the steps of: (1) preparing a sol containing SiO 2 with oxide powder dispersed therein in the presence of a drying control chemical additive, (2) gelling the sol to produce a monolithic SiO 2 gel matrix having homogeneously distributed therein the oxide powder, and (3) drying the monolithic SiO 2 gel/oxide powder composite, wherein the dried gel matrix of the composite is crack-free and has a surface area in the range of 600 m 2 /g to 1100 m 2 /g.
Claim 3
Dependent Claim
16 words
The method of claim 1 including the step of densifying the SiO 2 gel/oxide powder composite.
Claim 4
Dependent Claim
39 words
The method of claim 1 wherein the sol also contains a constituent selected from the group consisting of Al 2 O 3 , Li 2 O, Na 2 O, TiO 2 , B 2 O 3 and mixtures thereof.
Claim 5
Dependent Claim
70 words
The method of claim 1 wherein the oxide powder is selected from the group consisting of SiO 2 , Al 2 O 3 , ZrO 2 , TiO 2 , Li 2 O-TiO 2 , Li 2 O-Al 2 O 3 -TiO 2 , spodumene crystals, eucryptite crystals, aluminum titanate, 68 SiO 2 -21.4 Al 2 O 3 -5.7 TiO 2 -3.8 Li 2 O (mole %) and mixtures thereof.
Claim 6
Independent Claim
13 words
The method of 1 wherein the drying control chemical additive is oxalic acid.
Claim 7
Independent Claim
13 words
The method of 1 wherein the drying control chemical additive is oxalic acid.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein the drying control chemical additive is present from about 0.1 to about 10 weight percent of the matrix producing constituent(s) in the sol.
Claim 9
Dependent Claim
35 words
The method of claim 1 wherein the drying control chemical additive is selected from the group consisting of glycerol, formamide, oxalic acid and acids having the formula C n H 2 (n-1) O 2n .
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein the oxide powder is of a size from about 10 microns to about 0.001 micron.
Claim 11
Dependent Claim
17 words
The method of claim 8 wherein the oxide powder is of a size less than one micron.
Claim 12
Dependent Claim
26 words
A monolithic, gel-derived crack-free composite comprising a SiO 2 -containing gel matrix having homogeneously distributed therein an oxide powder made by the method of claim 1.
Claim 13
Dependent Claim
40 words
A composite as in claim 10 wherein the sol also contains a constituent selected from the group consisting of Al 2 O 3 , Li 2 O, Na 2 O, TiO 2 , B 2 O 3 and mixtures thereof.
Claim 14
Dependent Claim
71 words
A composite as in claim 10 wherein the oxide powder is selected from the group consisting of SiO 2 , Al 2 O 3 , ZrO 2 , TiO 2 , Li 2 O-TiO 2 , Li 2 O-Al 2 O 3 -TiO 2 , spodumene crystals, eucryptite crystals, aluminum titanate, 68 SiO 2 -21.4 Al 2 O 3 -5.7 TiO 2 -3.8 Li 2 O (mole %) and mixtures thereof.
Claim 15
Dependent Claim
42 words
A composite as in claim 10 wherein the matrix is SiO 2 and constitutes about 95 weight percent, and the oxide powder constitutes about 5 weight percent and is of a size less than 1 micron and is composed of spodumene crystals.
Claim 16
Dependent Claim
42 words
A composite as in claim 10 wherein the matrix is SiO 2 and constitutes about 80 weight percent and the oxide powder constitutes about 20 weight percent and is of a size less than 1 micron and is composed of aluminum titanate.
Claim 17
Dependent Claim
18 words
A composite as in claim 10 wherein the oxide powder is of a size less than 10 microns.
Claim 18
Dependent Claim
18 words
A composite as in claim 15 wherein the oxide powder is of a size less than 1 microns.
Claim 19
Dependent Claim
35 words
The composite of claim 10 wherein the drying control chemical additive is selected from the group consisting of glycerol, formamide, oxalic acid and acids having the formula C n H 2 (n-1) O 2n .
Claim 20
Dependent Claim
14 words
The composite of claim 17 wherein the drying control chemical additive is oxalic acid.
Claim 21
Dependent Claim
114 words
A monolithic, gel-derived crack-free composite comprising a SiO 2 -containing gel matrix having homogeneously distributed therein an oxide powder made by a method comprising the steps of: (1) preparing a sol containing SiO 2 with oxide powder dispersed therein in the presence of a drying control chemical additive; (2) gelling the sol to produce a monolithic SiO 2 gel matrix having homogeneously distributed therein the oxide powder; and (3) drying the monolithic SiO 2 gel/oxide powder composite, wherein the composite has the composition of about 70 mole percent SiO 2 , about 6 mole percent TiO 2 , about 19 mole percent Al 2 O 3 and about 5 mole percent Li 2 O.
Claim 22
Dependent Claim
114 words
A monolithic, gel-derived crack-free composite comprising a SiO 2 -containing gel matrix having homogeneously distributed therein an oxide powder made by a method comprising the steps of: (1) preparing a sol containing SiO 2 with oxide powder dispersed therein in the presence of a drying control chemical additive; (2) gelling the sol to produce a monolithic SiO 2 gel matrix having homogeneously distributed therein the oxide powder; and (3) drying the monolithic SiO 2 gel/oxide powder composite, wherein the composite has the composition of about 70 mole percent SiO 2 , about 6 mole percent TiO 2 , about 19 mole percent Al 2 O 3 and about 5 mole percent Li 2 O.
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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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |