公开(公告)号：US11192817B2

公开(公告)日：2021-12-07

申请号：US16740529

申请日：2020-01-13

申请人： AGC Inc.

发明人： Madoka Ono

IPC分类号： C03C3/091 ,  C03C23/00 ,  C03C21/00

摘要： A strengthened glass has a mirror constant A of 1.97 MPa·m0.5 or less, a surface compressive stress (CS) of 10 MPa or more. A product (t×CS) of a sheet thickness t (unit: mm) and the CS (unit: MPa) is less than 230. The strengthened glass may have a fictive temperature at a central portion in a sheet thickness t direction of not lower than a glass transition temperature Tg and Tg+100° C. or lower.

公开(公告)号：US10370281B2

公开(公告)日：2019-08-06

申请号：US15014359

申请日：2016-02-03

申请人： AGC Inc.

发明人： Madoka Ono ,  Setsuro Ito ,  Osamu Honma ,  Yousuke Amino

IPC分类号： C03C3/06 ,  C03B25/02 ,  C03B37/027 ,  C03B19/14 ,  C03B32/00

摘要： Provides is low scattering silica glass suitable as a material of an optical communication fiber. Silica glass has a fictive temperature of at least 1,000° C. and a void radius of at most 0.240 nm, as measured by positron annihilation lifetime spectroscopy. A method for heat-treating silica glass is also provided, which comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200° C. and at most 2,000° C. under a pressure of at least 30 MPa, and cooling the silica glass at an average temperature-decreasing rate of at least 40° C./min during cooling within a temperature range of from 1,200° C. to 900° C. A method for heat-treating silica glass also comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200° C. and at most 2,000° C. under a pressure of at least 140 MPa, and cooling the silica glass in an atmosphere under a pressure of at least 140 MPa during cooling within a temperature range of from 1,200° C. to 900° C.

公开(公告)号：US11535548B2

公开(公告)日：2022-12-27

申请号：US16386317

申请日：2019-04-17

申请人： AGC INC.

发明人： Suguru Murayama ,  Satoshi Kanasugi ,  Madoka Ono

IPC分类号： C03C3/083 ,  C03B23/03 ,  C03C3/085 ,  C03C3/087 ,  C03C3/091 ,  C03C3/093 ,  C03C3/097 ,  C03C21/00 ,  C03B23/035 ,  C03B23/025

摘要： A glass for chemical strengthening has a Young's modulus E of 70 GPa or more. The glass satisfies X1+X2+X3 being 1760 or less. Here, X1 is a numerical value equivalent to a value [unit: kPa/° C.] obtained by multiplying the Young's modulus E by an average coefficient α of thermal expansion at 50° C. to 350° C., X2 is a numeral value equivalent to a value of a temperature Tf [unit: ° C.] at which a viscosity of the glass reaches 100 MPa·s, and X3 is a numerical value equivalent to a value of a difference [unit: 105 Pa·s] between the viscosity (100 MPa·s) at the Tf and a viscosity η+10 at a temperature 10° C. higher than the Tf.