Bright red underglaze color, overglaze and their prepn process

Abstract

The present invention discloses one kind of bright red underglaze color, one kind of overglaze and their preparation process. The bright red underglaze color consists of stabilizer, 0.02-34 wt%, silica 11.3-56 wt%, lead oxide 2.4-27 wt%, cadmium sulfoselenide 2-20 wt%, Al2O3 1.7-27 wt%, B2O3 1.5-27 wt%, CrO2 0.3-32 wt%, GeO2 0.08-33 wt%, MgO 1.4-13 wt%, CaO 0.7-15 wt%, Li2O 0.7-13.2 wt%, K2O 1-7 wt% and NaO 1-5.3 wt%; and the overglaze consists of clinker 5-55 wt%, ZnO 3-12 wt%, albite 5-30 wt%, potash feldspar 7-35 wt%, baked talc 2-16 wt%, silica 2-18 wt%, and kaolin 2-26 wt%. The bright red underglaze color and the overglaze have pure color and very low Pb and Cd leaching amount.

Description

technical field [0001] The invention relates to bright red glaze for firing ceramic underglaze color and its preparation method, ceramic surface glaze and its preparation method and bright red ceramic underglaze color. Background technique [0002] Ceramic underglaze generally refers to ceramic products made by applying colored glaze or painting on the porcelain surface or bottom glaze, and then applying a layer of layer glaze. Because of the protection of the surface glaze, the ceramic products do not fade for a long time, such as brown-green underglaze in the Tang Dynasty. After thousands of years of wind and rain, the color is bright and has a unique artistic effect. Moreover, the coverage of the surface glaze blocks the environmental pollution and human health hazards of toxic substances in underglaze pigments to a certain extent. Compared with overglaze ceramic products, the release of toxic substances is much lower. Xiacai's ceramic products are very popular and have ...

AI Technical Summary

Problems solved by technology

[0005] 2. So far, cadmium sulfur selenide is the only ceramic pigment that can show bright red color, but this substance is not resistant to high temperature. Pure cadmium sulfur selenide will decompose at about 500°C, not only cannot show bright red color, but also produce toxic substance

In the prior art, there are invention patents "high temperature resistant cadmium sulfur selenide red glaze for ceramic glaze and its manufacturing method" (patent number: 01128545.1), "high temperature red glaze and its preparation method" (patent number: 200410047011.1) revealing Different degrees of high temperature-resistant bright red pigments containing cadmium selenide sulfur, in practical applications, the two inventions can not withstand the high temperature above 1350 ℃, can not fire underglaze color ceramic products, but can only be used as the surface color of ceramics. The glaze and surface color are used to fire cer