Glass-ceramics
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United States of America Patent
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Sep 4, 2012
Grant Date -
Oct 30, 2008
app pub date -
Apr 23, 2008
filing date -
Apr 27, 2007
priority date (Note) -
Expired
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Abstract
Glass-ceramics include SiO2, Al2O3 and Li2O on oxide basis. In the glass-ceramics, total amount in mass % of SiO2 and Al2O3 is less than 77% and Li2O/(SiO2+Al2O3) which is the ratio in mass % of the amount of Li2O to the total amount of SiO2 and Al2O3 is 0.064 or over. The glass-ceramics include at least one crystal phase selected from the group consisting of β-quartz, β-quartz solid solution, β-eucryptite, β-eucryptite solid solution, β-spodumene and β-spodumene solid solution.
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