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.