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US4415672A
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Glass-ceramic compositions of high refractoriness
Assignee: Corning Inc
•
Filing: 1982-05-20
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Granted: 1983-11-15
•
Expires: 2002-05-20
Abstract
Abstract The instant invention is directed to the preparation of glass-ceramic bodies exhibiting high strengths and use temperatures up to 1200° C. The bodies consist essentially, expressed in terms of weight percent on the oxide basis, of ______________________________________ Li 2 O 1.5-5 Al 2 O 3 15-25 SiO 2 60-75 ZrO 2 1-5 Nb 2 O 5 0-10 Ta 2 O 5 0-10 Nb 2 O 5 + Ta 2 O 5 1-10 MgO 0-10 ______________________________________ where excellent resistance to oxidation up to temperatures of 1200° C. is desired, 0.5-3% As 2 O 3 will be included in the composition.
Inventors
- 👤 John J. Brennan
- 👤 Kenneth Chyung
- 👤 Mark P. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:12
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/002; C03C10/00; C03C10/0018; C03C10/0027; C03C2214/00; C03C2214/02; C03C2214/03; C03C2214/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
An opaque glass-ceramic body exhibiting high strength and use temperature up to 1200° C., wherein beta-spodumene and/or beta-quartz solid solution constitutes the predominant crystal phase, which body is essentially free from TiO 2 and consists essentially, expressed in terms of weight percent on the oxide basis, of: ______________________________________
Li.sub.2 O 1.5-5
Al.sub.2 O.sub.3 15-25
SiO.sub.2 60-75
ZrO.sub.2 1- 3
Nb.sub.2 O.sub.5 0-10
Ta.sub.2 O.sub.5 0-10
Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5
1-10
MgO 0-10
ZnO 0-3
BaO 0-3
Fe.sub.2 O.sub.3 0-3
Nd.sub.2 O.sub.3 0-3
Na.sub.2 O 0-3
K.sub.2 O 0-3
CaO 0-3
SrO 0-3
ZnO + BaO + Fe.sub.2 O.sub.3 + Nd.sub.2 O.sub.3 +
0-10
Na.sub.2 O + K.sub.2 O + CaO + SrO
______________________________________
Claim 2
Dependent Claim
114 words
An opaque glass-ceramic body exhibiting high strength and use temperature up to 1200° C., wherein beta-spodumene and/or beta-quartz solid solution constitutes the predominant crystal phase, which body is essentially free from TiO 2 and consists essentially, expressed in terms of weight percent on the oxide basis, of: ______________________________________
Li.sub.2 O 1.5-5
Al.sub.2 O.sub.3 15-25
SiO.sub.2 60-75
ZrO.sub.2 1- 3
Nb.sub.2 O.sub.5 0-10
Ta.sub.2 O.sub.5 0-10
Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5
1-10
MgO 0-10
ZnO 0-3
BaO 0-3
Fe.sub.2 O.sub.3 0-3
Nd.sub.2 O.sub.3 0-3
Na.sub.2 O 0-3
K.sub.2 O 0-3
CaO 0-3
SrO 0-3
ZnO + BaO + Fe.sub.2 O.sub.3 + Nd.sub.2 O.sub.3 +
0-10
Na.sub.2 O + K.sub.2 O + CaO + SrO
______________________________________
Claim 3
Dependent Claim
27 words
A glass-ceramic body according to claim 1 wherein MgO is present in an amount of 1.5-6% and Li 2 O is present in an amount of 2-3.5%.
Claim 4
Dependent Claim
123 words
An opaque glass-ceramic body exhibiting high strength, a use temperature up to 1200° C., and oxidation resistance up to 1200° C., wherein beta-spodumene and/or beta-quartz solid solution constitutes the predominant crystal phase, which body is essentially free from TiO 2 and consists essentially, expressed in terms of weight percent on the oxide basis, of: ______________________________________
Li.sub.2 O 1.5-5
Al.sub.2 O.sub.3 15-25
As.sub.2 O.sub.3 0.5-3
SiO.sub.2 60-75
ZrO.sub.2 1-3
Nb.sub.2 O.sub.5 0-10
Ta.sub.2 O.sub.5 0-10
Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5
1-10
MgO 0-10
ZnO 0-3
BaO 0-3
Fe.sub.2 O.sub.3 0-3
Nd.sub.2 O.sub.3 0-3
Na.sub.2 O 0-3
K.sub.2 O 0-3
CaO 0-3
SrO 0-3
ZnO + BaO + Fe.sub.2 O.sub.3 +
0-10
Nd.sub.2 O.sub.3 + Na.sub.2 O + K.sub.2 O + CaO + SrO.
______________________________________
Claim 5
Dependent Claim
123 words
An opaque glass-ceramic body exhibiting high strength, a use temperature up to 1200° C., and oxidation resistance up to 1200° C., wherein beta-spodumene and/or beta-quartz solid solution constitutes the predominant crystal phase, which body is essentially free from TiO 2 and consists essentially, expressed in terms of weight percent on the oxide basis, of: ______________________________________
Li.sub.2 O 1.5-5
Al.sub.2 O.sub.3 15-25
As.sub.2 O.sub.3 0.5-3
SiO.sub.2 60-75
ZrO.sub.2 1-3
Nb.sub.2 O.sub.5 0-10
Ta.sub.2 O.sub.5 0-10
Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5
1-10
MgO 0-10
ZnO 0-3
BaO 0-3
Fe.sub.2 O.sub.3 0-3
Nd.sub.2 O.sub.3 0-3
Na.sub.2 O 0-3
K.sub.2 O 0-3
CaO 0-3
SrO 0-3
ZnO + BaO + Fe.sub.2 O.sub.3 +
0-10
Nd.sub.2 O.sub.3 + Na.sub.2 O + K.sub.2 O + CaO + SrO.
______________________________________
Claim 6
Dependent Claim
27 words
A glass-ceramic body according to claim 3 wherein MgO is present in an amount of 1.5-6% and Li 2 O is present in an amount of 2-3.5%.
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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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |