12-04-2018 дата публикации
Номер: US20180099901A1
Принадлежит:
A group of glass-ceramic compositions nucleated with ZrOand POcan develop a microstructure composed of spherulite grains, which produce a high fracture toughness (about 1.5 MPa·mor higher). Also, the glass-ceramic articles can be cerammed to have a CTE value of 30×10/° C. or lower. 1. A glass composition , comprising in weight percent:{'sub': '2', '60-75% SiO'}{'sub': 2', '3, '10-20% AlO'}{'sub': 2', '3, '0-4% BO'}{'sub': '2', '4-14% LiO'}{'sub': '2', '>0-5% NaO'}{'sub': '2', '0-4% KO'}0-8% MgO0-8% ZnO{'sub': '2', '>0-8% ZrO'}{'sub': '2', '0-4% TiO'}{'sub': 2', '5, '>0-5% PO, and optionally,'}{'sub': '2', '>0-0.5% SnO.'}2. The composition of claim 1 , comprising no more than 2% by weight of other oxides.3. The composition of claim 1 , comprising one or more of a) 0-1 wt % TiO claim 1 , b) 0.1-5 wt % NaO claim 1 , c) 0.5-8 wt % ZrO claim 1 , or d) 0.5-5 wt % PO.4. The composition of claim 1 , comprising one or more 0.2 wt % or less of KO claim 1 , 60-70% SiO claim 1 , 12-16% AlO claim 1 , 5-9% LO claim 1 , 0.5-2% NaO claim 1 , 1-3% MgO claim 1 , 2-4% ZnO claim 1 , 0.5-4% ZrO claim 1 , or 1-3% PO.6. The glass composition of claim 5 , comprising one or more of 0-1 wt % TiOor 0.2 wt % or less KO.8. The glass ceramic composition according to claim 7 , comprising one or more of a) 0-1 wt % TiO claim 7 , b) 0.1-5 wt % NaO claim 7 , c) 0.5-8 wt % ZrO claim 7 , or d) 0.5-5 wt % POor e) 0.2 wt % or less KO.10. The glass ceramic composition according to claim 7 , wherein the glass ceramic is greater than 60% crystalline and comprises spherulite grains having an average grain size of from 5-10 □m.11. An article comprising the glass ceramic composition of .12. A method of making a glass ceramic claim 7 , comprising: [{'sub': '2', '60-75% SiO'}, {'sub': 2', '3, '10-20% AlO'}, {'sub': 2', '3, '0-4% BO'}, {'sub': '2', '4-14% LiO'}, {'sub': '2', '>0-5% NaO'}, {'sub': '2', '0-4% KO'}, '0-8% MgO', '0-8% ZnO', {'sub': '2', '>0-8% ZrO'}, {'sub': '2', '0-4% TiO'}, {'sub': 2', '5, '>0-5% ...
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