Glass ceramics comprising beta-quartz or beta-quartz solid solution
AssigneeKabushiki Kaisha Ohara
InventorKousuke Nakajima
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Abstract
Glass-ceramics includes Li2O, Al2O3 and SiO2, have an average crystal grain diameter of a predominant crystal phase of 90 nm or below and have crystal grain diameter distribution of 20 nm or below. The glass-ceramics can be manufactured by heat treating glass comprising Li2O, Al2O3 and SiO2 under a temperature within a range from 650° C. to 750° C. and then further heat treating the glass under a temperature within a range from 700° C. to 800° C. for 100-200 hours.
Claims11
Glass-ceramics comprising Li2O, Al2O3 and SiO2, comprising β-quartz and/or β-quartz solid solution as a predominant crystal phase, having an average crystal grain diameter of a predominant crystal phase of 90 nm or below and having crystal grain diameter distribution of 20 nm or below, and further having an average linear thermal expansion coefficient within a range of 0.0±0.2×10−7/° C. within a temperature range from 0° C. to 50° C., wherein crystal grain diameter distribution means standard deviation of crystal grain diameters having visual calculation constant of 30 or more obtained by visual inspection of crystal grains of a transmission electron microscopic photograph.
Dependencies are inferred from the claim text.