Low expansion coefficient micro crystal glass and its heat processing method

Abstract

The present invention provides one kind of low expansion coefficient micro crystalline glass comprising SiO2 51.5-64 wt%, P2O5 6.8-11 wt%, Li2O 3-5.2 wt%, MgO 0.5-2.2 wt%, ZnO 0.4-2.1 wt%, CaO 0.2-2.5 wt%, BaO 0.5-4.5 wt%, SrO 0.2-3 wt%, and Sb2O3 0.6-2 wt%, Al2O3+SiO2 75-84 wt%, and TiO2+ZrO2 3.5-5 wt%. The micro crystalline glass has expansion coefficient at 20-100 deg.C of + / -0.6x10<-7> / K, visible light transmittance up to 90 %, low recrystallization trend and easy formation.

Description

technical field [0001] The present invention relates to a kind of glass ceramics with low expansion coefficient, particularly relate to a kind of Li 2 O-Al 2 o 3 -SiO 2 Systematic low-expansion-coefficient glass-ceramic and its heat treatment method. Background technique [0002] Japanese Patent Laid-Open No. 2005-89272 and Japanese Patent Laid-Open No. 2005-231994 disclose two kinds of low-expansion coefficient glass-ceramics. The chemical composition of these two technical solutions does not contain SrO, and its crystallization tendency and forming difficulty are not clear. [0003] The existing heat treatment method for glass-ceramics with low expansion coefficient is mainly a two-step method. This method is mainly aimed at thin plates or small pieces of glass that require rapid heat treatment, and it is difficult to heat treat bulk materials. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a glass-ceramic...

AI Technical Summary

Problems solved by technology

[0003] The existing heat treatment method for glass-ceramics with low expansion coefficient is mainly a two-step method. This method is mainly aimed at thin plates or small pieces of glass that require rapid heat treatment, and it is difficult to heat treat bulk materials.

Images