Zircon-free anorthite-based opaque glaze and preparation method thereof

Abstract

The invention discloses a zircon-free anorthite-based opaque glaze, which comprises the following raw materials: 5-10 wt% of clay, 0-10 wt% of potassium feldspar, 20-40 wt% of albite, 5-20 wt% of quartz, 10-25 wt% of calcite, 0-10 wt% of wollastonite, 8-15 wt% of aluminum oxide, 1-10 wt% of zinc oxide, 3-8 wt% of calcined talc, 1-15 wt% of glass powder and 0.5-1.5 wt% of a nucleating agent. The invention also discloses a preparation method of the zircon-free anorthite-based opaque glaze. According to the invention, by using the low-cost raw materials and optimizing the formula system, flaky orblocky anorthite crystals are separated out from the interior of the glaze layer, and the three-dimensional crystallization is combined, so that the good glaze opacifying effect is achieved while thewhiteness and the hardness of the glaze are also improved, and the product performance is effectively improved; the raw materials do not contain radioactive elements and are harmless to the environment and human bodies; the opaque glaze is wide in application range and beneficial to popularization and application.

Description

Technical field [0001] The invention relates to the technical field of ceramic glazes, in particular to an anorthite-based opacified glaze and a preparation method thereof. Background technique [0002] In order to cover the poor coloring and defects of the green body and expand the source of raw materials, opal glaze with good decorative effect is widely used on the surface of architectural ceramics and sanitary ceramics. [0003] The opacification mechanism of opalescent glaze is that when there is a second phase (or multiphase) in the glaze layer with different properties from the basic glass, incident light passing through the glaze layer will be reflected, refracted and diffusely reflected at the multiphase interface And other phenomena, so that the glaze layer is devitrified and the opacifying effect is obtained. The opal glaze commonly used in the ceramic industry is tin oxide opal glaze, titanium oxide opal glaze and zirconium silicate opal glaze. Tin oxide opacified glaz...

AI Technical Summary

Problems solved by technology

Tin oxide opacifying glaze has a good opacifying effect, but the disadvantage is that it is expensive and sensitive to atmosphere. If fired in a reducing atmosphere, a transparent glaze will be obtained.

TiO in Titanium Oxide Opaque Glaze 2 Crystallization makes the glaze surface have a good opacity effect, but it is mainly suitable for low-temperature enamel glazes with a firing temperature of 750-850°C. When the firing temperature is ≥1000°C, the glaze surface is prone to yellowing

Zirconium silicate opaque glaze is the most widely used opaque glaze at present. Its advantages are high whiteness and insensitivity to atmosphere. However, zirconium silicate will partially melt at high temperature, so its addition amount needs to reach 10-20wt%. to achieve the desired opacification effect, resulting in increased cost

In addition, the ore of zirconium silicate is often associated with Ra 226 、Th 232 、K 40 When a large amount of zirconium silicate is added to the glaze, the radioactivity of the product will exceed the standard, which will damage the health of consumers

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