公开(公告)号：US20210292226A1

公开(公告)日：2021-09-23

申请号：US17341462

申请日：2021-06-08

Applicant: AGC Inc.

Inventor： Takumi UMADA ,  Kenji IMAKITA ,  Yusuke ARAI ,  Tatsuya MIYAJIMA

IPC: C03C3/097 ,  C03C21/00 ,  C03C3/085 ,  C03C3/087 ,  C03C3/091 ,  C03C3/095 ,  C03C4/18 ,  H05K5/03

Abstract: The present invention relates to a glass having a fracture toughness value of 0.85 MPa·m1/2 or more, and including, as represented by molar percentage based on oxides, 40% or more of SiO2, 20% or more of Al2O3, 5% or more of Li2O, and from 1 to 6% in total of one or more selected from Y2O3, La2O3 and Ga2O3. The present invention relates to a glass including, as represented by molar percentage based on oxides, from 40 to 60% of SiO2, from 20 to 45% of Al2O3, and from 5 to 15% of Li2O. Denoting the content of SiO2 as [SiO2] and the content of Al2O3 as [Al2O3], (2×[Al2O3]-X)/[SiO2] is 0 or more and 1 or less.