US4314909A
Expired / Lapsed
US
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Highly refractory glass-ceramics suitable for incorporating radioactive wastes
Assignee: Corning Glass Works
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Filing: 1980-06-30
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Granted: 1982-02-09
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Expires: 2000-06-30
Abstract
Abstract This invention is concerned with the production of glass-ceramics especially suitable for incorporating radioactive wastes. The inventive glass-ceramics contain at least two crystal phases selected from the group of pollucite, mullite, monazite, and, optionally, tetragonal or cubic zirconia as the predominant crystal phases and consist essentially, expressed in weight percent on the oxide basis, of 5-40% Cs 2 O, 15-50% Al 2 O 3 , 0-30% La 2 O 3 +CeO 2 , 0-20% P 2 O 5 , 0-30% ZrO 2 , 12-65% La 2 O 3 +CeO 2 +P 2 O 5 , and 15-50% SiO 2 .
Inventors
- 👤 George H. Beall
- 👤 Hermann L. Rittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:15
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C10/00; C03C10/0009; G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/302; G21F9/305
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A glass-ceramic especially suitable for incorporating radioactive wastes wherein the crystal phases thereof consist essentially of monazite and pollucite and at least one of the group mullite, and ZrO 2 , said glass-ceramic consisting essentially, expressed in weight percent on the oxide basis, of 5-40% Cs 2 O, 15-50% Al 2 O 3 , 5-30% La 2 O 3 +CeO 2 , up to 20% P 2 O 5 , 0-30% ZrO 2 , 12-65% La 2 O 3 +CeO 2 +P 2 O 5 +ZrO 2 , and 15-50% SiO 2 .
Claim 2
Dependent Claim
93 words
A glass-ceramic especially suitable for incorporating radioactive wastes wherein the crystal phases thereof consist essentially of monazite and pollucite and at least one of the group mullite, and ZrO 2 , said glass-ceramic consisting essentially, expressed in weight percent on the oxide basis, of 5-40% Cs 2 O, 15-50% Al 2 O 3 , 5-30% La 2 O 3 +CeO 2 , up to 20% P 2 O 5 , 0-30% ZrO 2 , 12-65% La 2 O 3 +CeO 2 +P 2 O 5 +ZrO 2 , and 15-50% SiO 2 .
Claim 3
Independent Claim
158 words
A method for making a glass-ceramic especially suitable for incorporating radioactive wastes wherein the crystal phases thereof consist essentially of monazite and pollucite and at least one of the group mullite, and ZrO 2 which comprises the steps of: (a) melting a batch for a glass consisting essentially, expressed in weight percent on the oxide basis, of 5-40% Cs 2 O, 15-50% Al 2 O 3 , 5-30% La 2 O 3 +CeO 2 , up to 20% P 2 O 5 , 0-30% ZrO 2 , 12-65% La 2 O 3 +CeO 2 +P 2 O 5 +ZrO 2 , and 15-50% SiO 2 ; (b) simultaneously cooling said melt at least below the transformation range thereof and shaping a glass body of a desired configuration therefrom; and thereafter (c) exposing said glass body to a temperature between about 1250°-1550° C. for a period of time sufficient to cause the growth in situ of the desired crystals.
Claim 4
Independent Claim
158 words
A method for making a glass-ceramic especially suitable for incorporating radioactive wastes wherein the crystal phases thereof consist essentially of monazite and pollucite and at least one of the group mullite, and ZrO 2 which comprises the steps of: (a) melting a batch for a glass consisting essentially, expressed in weight percent on the oxide basis, of 5-40% Cs 2 O, 15-50% Al 2 O 3 , 5-30% La 2 O 3 +CeO 2 , up to 20% P 2 O 5 , 0-30% ZrO 2 , 12-65% La 2 O 3 +CeO 2 +P 2 O 5 +ZrO 2 , and 15-50% SiO 2 ; (b) simultaneously cooling said melt at least below the transformation range thereof and shaping a glass body of a desired configuration therefrom; and thereafter (c) exposing said glass body to a temperature between about 1250°-1550° C. for a period of time sufficient to cause the growth in situ of the desired crystals.
Claim 5
Dependent Claim
42 words
A method according to claim 2 wherein prior to exposing said glass article to a temperature between about 1250°-1550° C. it is exposed to a temperature between about 900°-1100° C. for a period of time sufficient to cause nucleation to occur therein.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |