A kind of transparent lead-free frit glaze with small expansion coefficient and preparation method thereof

Abstract

The invention relates to a transparent lead-free frit glaze with a small expansion coefficient and a preparation method thereof. The chemical composition of the frit glaze is: 59-66% SiO2, 10-15% Al2O3, 5-10% B2O3, 3-6% CaO, 4-8% MgO, 0-3% K2O, 0-2% Na2O, 0-1% Li2O, 1-5% ZnO, 0-2% SrO, the raw material formula used is: kaolin 10-25%, Quartz 15-30%, potassium feldspar 10-25%, dolomite 0-8%, wollastonite 2-6%, burnt talc 10-20%, zinc oxide 1-6%, boric acid 2-8%, boric acid Calcium 5-15%, aluminum oxide 1-5%, lithium carbonate 0-2%, strontium carbonate 0-3%. The expansion coefficient of the frit glaze of the present invention is 3.7~4.5×10-6 / °C (RT~500°C), the melting temperature is 1400°C~1500°C, the glaze firing temperature is 1130°C~1230°C, and the glaze surface is delicate and bright , high transparency, small expansion coefficient, lead-free dissolution, especially suitable for hard porcelain body with low expansion coefficient for secondary firing.

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