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US5219799A
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Lithium disilicate-containing glass-ceramics some of which are self-glazing
Assignee: IVOCLAR NORTH AMERICA Inc
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Filing: 1991-10-07
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Granted: 1993-06-15
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Expires: 2011-10-07
Abstract
Abstract This invention relates to glass-ceramic articles containing lithium disilicate crystals as the predominant crystal phase and consisting essentially, in weight percent, of 8-19% Li 2 O, 0-5% Na 2 O, 0-7% K 2 O, 0-8% Na 2 O+K 2 O, 0-10% CaO, 0-6% SrO, 0-6% BaO, 2-12% Na 2 O+K 2 O+CaO+SrO+BaO, 0-7% ZnO, 0-11% Al 2 O 3 , 1.5-11% ZnO+Al 2 O 3 , with a molar ratio (Na 2 O+K 2 O) (ZnO+Al 2 O 3 ) between 0.075-1.25, 65-80% SiO 2 , and as a nucleating agent 1.5-7% P 2 O 5 and/or 0.0001-0.1% Pd. Glass-ceramics having certain compositions within those ranges are self-glazing.
Inventors
- 👤 George H. Beall
- 👤 Lina M. Echeverria
- 👤 Joseph W. Morrissey
- 👤 Joseph E. Pierson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:57
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0009
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A glass-ceramic article containing Li 2 O·2SiO 2 as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, of 8-19% Li 2 O, 0-5% Na 2 O, 0-7% K 2 O, 0-8% Na 2 O+K 2 O, 0-10% CaO, 0-6% SrO, 0-6% BaO, 2-12% Na 2 O+K 2 O+CaO+SrO+BaO, 0-7% ZnO, 0-11% Al 2 O 3 , 1.5-11% ZnO+Al 2 O 3 , with a molar ratio (Na 2 O+K 2 O+CaO+SrO+BaO):(Al 2 O 3 +ZnO) between 0.075-1.25, 65-80% SiO 2 , and as a nucleating agent 1.5-7% P 2 O 5 and/or 0.0001-0.1% Pd.
Claim 2
Dependent Claim
102 words
A glass-ceramic article containing Li 2 O·2SiO 2 as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, of 8-19% Li 2 O, 0-5% Na 2 O, 0-7% K 2 O, 0-8% Na 2 O+K 2 O, 0-10% CaO, 0-6% SrO, 0-6% BaO, 2-12% Na 2 O+K 2 O+CaO+SrO+BaO, 0-7% ZnO, 0-11% Al 2 O 3 , 1.5-11% ZnO+Al 2 O 3 , with a molar ratio (Na 2 O+K 2 O+CaO+SrO+BaO):(Al 2 O 3 +ZnO) between 0.075-1.25, 65-80% SiO 2 , and as a nucleating agent 1.5-7% P 2 O 5 and/or 0.0001-0.1% Pd.
Claim 3
Dependent Claim
17 words
A glass-ceramic article according to claim 1 containing at least 2% ZnO and/or 2% K 2 O.
Claim 4
Dependent Claim
19 words
A glass-ceramic article according to claim 1 containing at least 1% CaO and/or 3% Al 2 O 3 .
Claim 5
Dependent Claim
53 words
A glass-ceramic article according to claim 1 also containing 0.01-7% total of at least one member of the group consisting of CdS, cadmium sulfoselenide, CeO 2 , Co 3 O 4 , Cr 2 O 3 , CuO, Fe 2 O 3 , MnO 2 , NiO, and V 2 O 5 .
Claim 6
Dependent Claim
96 words
A self-glazed glass-ceramic article containing Li 2 O·2SiO 2 as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, of 9-18% Li 2 O, 2-10% total of at least one member of the group consisting of 0-7% K 2 O, 0-8% CaO, 0-6% SrO, and 0-6% BaO, 0-7% ZnO, 0-10% Al 2 O 3 , 1.5-10% Al 2 O 3 +ZnO, with a molar ratio (K 2 O+CaO+SrO+BaO):(Al 2 O 3 +ZnO) between 0.1-0.8, 65-77% SiO 2 , and as a nucleating agent 2-6% P 2 O 5 .
Claim 7
Dependent Claim
96 words
A self-glazed glass-ceramic article containing Li 2 O·2SiO 2 as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, of 9-18% Li 2 O, 2-10% total of at least one member of the group consisting of 0-7% K 2 O, 0-8% CaO, 0-6% SrO, and 0-6% BaO, 0-7% ZnO, 0-10% Al 2 O 3 , 1.5-10% Al 2 O 3 +ZnO, with a molar ratio (K 2 O+CaO+SrO+BaO):(Al 2 O 3 +ZnO) between 0.1-0.8, 65-77% SiO 2 , and as a nucleating agent 2-6% P 2 O 5 .
Claim 8
Dependent Claim
16 words
A self-glazed glass-ceramic article according to claim 5 also containing up to 3% ZrO 2 .
Claim 9
Dependent Claim
54 words
A self-glazed glass-ceramic article according to claim 5 also containing 0.01-7% total of at least one member of the group consisting of CdS, cadmium sulfoselenide, CeO 2 , Co 3 O 4 , Fe 2 O 3 , CuO, Cr 2 O 3 , MnO 2 , NiO, and V 2 O 5 .
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