Preparation method for milk-white and heat-resistant microcrystalline glass with low dilatability

Abstract

The invention provides a preparation method for milk-white and heat-resistant microcrystalline glass with low dilatability. The microcrystalline glass is composed of the following raw materials, in parts by weight: 5-8 parts of lithium carbonate, 22-26 parts of aluminium hydroxide, 59-63 parts of quartz sand, 1.2-1.8 parts of magnesium oxide, 2.4-3 parts of zinc oxide, 1.4-1.6 parts of sodium nitrate, 0.14-0.21 part of zircon sand, 0.3-0.5 part of antimony oxide, and 4-5 parts of titanium oxide. The preparation method provided in the invention aims to solve the technical problem that Li<2>O-Al<2>O<3>-SiO<2> (LAS) milk-white and heat-resistant microcrystalline glass has the characteristics of high melting temperature, large molten glass viscosity and high glass viscosity variation speed, and under the preconditions that main physical and chemical properties of LAS glass are not changed, the melting temperature and the nucleating temperature of the LAS basic glass prepared by the method provided in the invention can be reduced .

Description

technical field [0001] The invention relates to the technical field of glass preparation, in particular to a preparation method of low-expansion milky white heat-resistant glass-ceramics. Background technique [0002] Glass-ceramics is a basic glass-ceramic with a specific composition, which becomes a composite material with uniform distribution of microcrystals and glass phases after heat treatment at a specific temperature. [0003] Li 2 O-AL 2 o 3 -SiO 2 Milky white glass-ceramics is an important variety of glass-ceramics. It is famous for its low coefficient of thermal expansion, good thermal stability, and thermal shock resistance above 850°C. This material has relatively high hardness, mechanical strength, chemical stability, and electrical insulation, and is used in the manufacture of cookware, tableware, induction cooker panels, high-temperature heat exchangers, etc. [0004] In this glass composition SiO 2 、AL 2 o 3 The mass fraction of glass accounts for m...

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is for Li 2 O-AL 2 o 3 -SiO 2 Milky white heat-resistant glass-ceramic has the characteristics of high melting temperature, high viscosity of glass liquid, and short material property. It provides a method that can reduce the melting temperature and nucleation temperature of LAS basic glass without changing the main physical and chemical properties of the glass.

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