Tempered glass substrate and method of producing the same

摘要

A tempered glass substrate of the present invention is a tempered glass substrate, which has a compression stress layer on a surface thereof, and has a glass composition comprising, in terms of mass %, 40 to 71% of SiO2, 3 to 21% of Al2O3, 0 to 3.5% of Li2O, 7 to 20% of Na2O, and 0 to 15% of K2O.

主权项

1. A tempered glass substrate, which has a compression stress layer on a surface thereof, and has a glass composition comprising, in terms of mass %, 58.4 to 71% of SiO2, 3 to 23% of Al2O3, 0 to 1% of Li2O, 8.2 to 20% of Na2O, 0 to 2% of K2O, 0.5% or less of TiO2, and 0 to 4% of MgO+CaO+SrO+BaO, wherein the compression stress layer has a compression stress value of 600 MPa or more, and wherein the tempered glass substrate has an unpolished surface having an average surface roughness Ra of 5 Å or less.