Transparent lead-free fritted glaze with low expansion coefficient and preparation method thereof

Abstract

The invention relates to a transparent lead-free fritted glaze with low expansion coefficient and a preparation method thereof. The fritted glaze comprises the following chemical ingredients of: 59 to 66 percent of SiO2, 10 to 15 percent of Al2O3, 5 to 10 percent of B2O3, 3 to 6 percent of CaO, 4 to 8 percent of MgO, 0 to 3 percent of K2O, 0 to 2 percent of Na2O, 0 to 1 percent of Li2O, 1 to 5 percent of ZnO and 0 to 2 percent of SrO; and the fritted glaze comprises the raw materials of: 10 to 25 percent of kaolin, 15 to 30 percent of quartz, 10 to 25 percent of potassium feldspar, 0 to 8 percent of dolomite, 2 to 6 percent of grammite, 10 to 20 percent of roasted talc, 1 to 6 percent of zinc oxide, 2 to 8 percent of boric acid, 5 to 15 percent of calcium borate, 1 to 5 percent of alumina, 0 to 2 percent of lithium carbonate and 0 to 3 percent of strontium carbonate. The expansion coefficient of the fritted glaze is 3.7-4.5*10-6 / DEG C (RT to 500 DEG C), the melted temperature is 1400 DEG C to 1500 DEG C, the glaze firing temperature is 1130 DEG C to 1230 DEG C; and the transparent lead-free fritted glaze has fine and bright glaze surface, high transparency, low expansion coefficient as well as no lead precipitation and is particularly suitable for double-fired hard porcelain body with lower expansion coefficient.

Description

technical field [0001] The invention belongs to the technical field of daily-use ceramics, and in particular relates to a transparent lead-free frit glaze with a relatively low expansion coefficient and a preparation method of the frit glaze. Background technique [0002] Nowadays, the production of high-grade daily-use fine porcelain at home and abroad all adopts the secondary firing process without exception. The secondary firing process can be divided into two types: ① low-temperature plain firing, high-temperature glaze firing, ② high-temperature plain firing, low-temperature glaze firing. Internationally, European hard porcelain such as Copenhagen porcelain from Denmark, Seiffel porcelain from France, Saxony porcelain from German Meissen Company, etc. are used in the international application of low-temperature bisque firing and high-temperature glaze firing. Porcelain is also produced using this process. Both the blank and the glaze are fired at high temperature in t...

AI Technical Summary

Problems solved by technology

[0003] At present, my country produces a large number of hard porcelain fired at about 1350°C. These hard porcelains can be made of high-white and high-transparency daily-use fine porcelain through a single firing process through selection of high-quality raw materials and fine workmanship. However, due to hard The thermal expansion coefficient of the porcelain is too low (α=3.5~5.0×10 -6 / °C), it cannot be matched with high-quality low-temperature frit glaze, so it is impossible to use the secondary firing process of high-temperature biscuit firing and low-temperature glaze firing to upgrade it to high-grade daily-use fine porcelain