Non-alkali glass and method for producing same

摘要

The present invention relates to a non-alkali glass having a strain point of from 710° C. to lower than 725° C., an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPd·s of 1320° C. or lower, and containing, indicated by mol % on the basis of oxides, SiO2 66 to 70, Al2O3 12 to 14, B2O3 exceeding 0 to 1.5, MgO exceeding 9.5 to 13 (or 5 to 9.5), CaO 4 to 9 (or 4 to 11), SrO 0.5 to 4.5, BaO 0 to 0.5 and ZrO 0 to 2.

主权项

1. A non-alkali glass having a strain point of from 710° C. to lower than 725° C., an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1320° C. or lower, and comprising, indicated by mol % on the basis of oxides,
SiO2 66 to 70, Al2O3 12 to 14, B2O3 exceeding 0 to 1.5, MgO 5 to 9.5, CaO 4 to 11, SrO 0.5 to 4.5, BaO 0 to 0.5 and ZrO2 0 to 2, wherein MgO+CaO+SrO+BaO is from exceeding 18.2 to 21, MgO/(MgO+CaO+SrO+BaO) is 0.25 or more, MgO/(MgO+CaO) is 0.3 or more, MgO/(MgO+SrO) is 0.6 or more, and Al2O3×(MgO/(MgO+CaO+SrO+BaO)) is 5.5 or more.