US4047966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of enhancing the refractoriness of high purity fused silica
Assignee: Corning Glass Works
•
Filing: 1976-04-26
•
Granted: 1977-09-13
•
Expires: 1996-04-26
Abstract
Abstract A method is disclosed wherein high purity fused silica is produced from a liquid flowable form of a silica slurry or sol and the refractoriness of the fused silica is enhanced by homogeneously doping the silica with aluminum and/or titanium oxide, preferably in conjunction with elemental silicon.
Inventors
- 👤 Peter P. Bihuniak
- 👤 Donald L. Guile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:08
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; C04; C04B; C04B35/00; C04B35/01; C04B35/14; C03C2201/00; C03C2201/06; C03C2201/20; C03C2201/30; C03C2201/32; C03C2201/40; C03C2201/42; C03C2203/00; C03C2203/10; C03C2203/20; C03C2203/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
78 words
In an improved method of producing a high purity fused silica product, wherein a liquid flowable form of a silica slurry or sol is dried to form solid silica bodies which are then thermally vitrified, the improvement, whereby the refractoriness of the fused silica is enhanced, which comprises doping the silica containing liquid with 10 to 1000 parts per million by weight, as based on the fused silica, of aluminum and/or titanium oxide calculated on the metal basis.
Claim 2
Dependent Claim
78 words
In an improved method of producing a high purity fused silica product, wherein a liquid flowable form of a silica slurry or sol is dried to form solid silica bodies which are then thermally vitrified, the improvement, whereby the refractoriness of the fused silica is enhanced, which comprises doping the silica containing liquid with 10 to 1000 parts per million by weight, as based on the fused silica, of aluminum and/or titanium oxide calculated on the metal basis.
Claim 3
Dependent Claim
31 words
In a method in accordance with claim 1, the further improvement which comprises dispersing, in conjunction with the selected oxide, up to 1500 parts per million by weight of elemental silicon.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 1 wherein the selected oxide is aluminum oxide.
Claim 5
Dependent Claim
40 words
A method in accordance with claim 2 wherein the selected oxide is 20 to 200 parts per million aluminum oxide, calculated on the metal basis, and the elemental silicon is in the range of 200 to 800 parts per million.
Claim 6
Independent Claim
83 words
A method for producing a high purity fused silica product which comprises the steps of doping a liquid flowable form of silica slurry or sol with 10 to 1000 parts per million by weight, as based on the fused silica, of aluminum and/or titanium oxide, calculated on the metal basis, drying the doped source of silica to rigid silica fragments containing the doping oxide, calcining the silica fragments at about 1150°-1500° C., and then firing said silica fragments to a fused silica product.
Claim 7
Independent Claim
83 words
A method for producing a high purity fused silica product which comprises the steps of doping a liquid flowable form of silica slurry or sol with 10 to 1000 parts per million by weight, as based on the fused silica, of aluminum and/or titanium oxide, calculated on the metal basis, drying the doped source of silica to rigid silica fragments containing the doping oxide, calcining the silica fragments at about 1150°-1500° C., and then firing said silica fragments to a fused silica product.
Claim 8
Dependent Claim
14 words
A method in accordance with claim 5 wherein the selected oxide is aluminum oxide.
Claim 9
Dependent Claim
28 words
A method in accordance with claim 5 which further comprises dispersing, in conjunction with the selected oxide, up to 1500 parts per million by weight of elemental silicon.
Claim 10
Dependent Claim
35 words
A method in accordance with claim 7 wherein the selected oxide is 20 to 200 parts per million aluminum oxide and the elemental silicon is in the range of 200 to 800 parts per million.
Claim 11
Dependent Claim
38 words
A method in accordance with claim 5 wherein the calcined product is milled to form a slip which is cast in a mold and the product thus formed is fired to a fused silica body of corresponding shape.
Claim 12
Independent Claim
71 words
A method of enhancing the refractoriness of a fused silica product which comprises doping a liquid flowable form of a silica slurry or sol with 10 to 1000 parts per million by weight, as based on the fused silica, of aluminum and/or titanium oxide, calculated on the metal basis, drying the oxide doped source of silica to form solid silica bodies, and firing said silica bodies to a fused silica product.
Claim 13
Independent Claim
71 words
A method of enhancing the refractoriness of a fused silica product which comprises doping a liquid flowable form of a silica slurry or sol with 10 to 1000 parts per million by weight, as based on the fused silica, of aluminum and/or titanium oxide, calculated on the metal basis, drying the oxide doped source of silica to form solid silica bodies, and firing said silica bodies to a fused silica product.
Claim 14
Dependent Claim
14 words
A method in accordance with claim 10 wherein the selected oxide is aluminum oxide.
Claim 15
Dependent Claim
29 words
A method in accordance with claim 10 which further comprises doping, in conjunction with the selected oxide, with up to 1500 parts per million by weight of elemental silicon.
Claim 16
Dependent Claim
35 words
A method in accordance with claim 12 wherein the selected oxide is 20 to 200 parts per million aluminum oxide and the elemental silicon is in the range of 200 to 800 parts per million.
References Cited (Backward Citations)
US3370921A
Cited
US3848152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |