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 ceramics with a bright red color (the firing temperature is about 1300°C), and the unavoidable problem of this type of product is that the amount of lead and cadmium dissolved is large, so it is difficult to get involved in tableware or children's products

[0006] 3. In the process of repeated practice, the existing surface glaze does not match the red glaze under the glaze, and the surface glaze erodes the red glaze, and the color of the fired ceramic product is distorted, and cracks, pinholes, shrinkage and other glazes appear Surface defects, while the dissolution of lead and cadmium is difficult to control within the increasingly stringent standards

[0007] Because of this, today, more than a thousand years after the advent of underglaze brown green, although the ceramic circles around the world have invested a lot of manpower and material resources, they still have not been able to burn the bright red underglaze color.