Li2O-Al2O3-SiO2-based crystallized glass

Abstract

This invention provides an Li2O-Al2O3-SiO2-based crystallized glass that can effectively utilize glass recovered from the market and can be provided without any troublesome work and suffers from no significant coloration. The Li2O-Al2O3-SiO2-based crystallized glass is an Li2O-Al2O3-SiO2-based crystallized glass comprising, by mass, 50 to 500 ppm of Fe2O3, 5 to 100 ppm of CoO + Cr2O3 + NiO + MnO, and contains 0 to 70 ppm of CoO + NiO. The Li2O-Al2O3-SiO2-based crystallized glass is characterized in that, in an L*a*b* color system, for a 4 mm-thick glass, the a* value is -2 to 2, and the b* value is -10 to 20. The crystallized glass is a white opaque or colorless transparent glass and thus is suitable, for example, for front windows, for example, in oil stoves and wood stoves, substrates for high technology products such as substrates for color filters or image sensors, shelf boards for microwave ovens, top plates for electromagnetic cooking, and window glass for fire fighting.

Description

technical field [0001] The present invention relates to a kind of Li 2 O—Al 2 o 3 —SiO 2 Department of crystallized glass. Background technique [0002] Crystallized glass is used in various applications because of its high mechanical strength and ease of processing. For example, Patent Documents 1 to 3 disclose the precipitation of β-quartz solid solution (Li 2 O·Al 2 o 3 · nSiO2 2 [where n≥2]) and β-spodumene solid solution (Li 2 O·Al 2 o 3 · nSiO2 2 [where n≥4]) Li formed as the main crystal 2 O—Al 2 o 3 —SiO 2 It is crystallized glass, which is used for front windows of kerosene stoves and firewood stoves, substrates for high-tech products such as color filters or substrates for image sensors, regulators for firing electronic components, shelves for microwave ovens, and electromagnetic cooking Roof for furnace, window glass for fire door, reflector, etc. [0003] The above Li 2 O—Al 2 o 3 —SiO 2 The crystallized glass has a low expansion coefficient ...

AI Technical Summary

Problems solved by technology

[0013] The existing crystallized glass has the following problems: the Li which will be decorated by the inorganic pigment 2 O—Al 2 o 3 —SiO 2 When the cooking top plate made of crystallized glass is directly crushed and used as a glass raw material, the glass will be colored. In addition, when crystallized to produce crystallized glass, the inorganic pigment components on the glass substrate will be concentrated, so the coloring will be strengthened.

[0014] In addition, the decorative layer or light-shielding layer containing inorganic pigments is firmly adhered by glass frit, so it is necessary to completely separate the crystallized glass plate from the decorative layer or light-shielding layer. take a long time

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