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 a scarlet material for firing ceramic underglaze colors, a ceramic surface glaze, a preparation method thereof and a ceramic underglaze scarlet. 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 been widely used as decora...

AI Technical Summary

Problems solved by technology

In the prior art, there are invention patents "high temperature resistant cadmium sulfur selenide red material 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 In actual application, the above two inventions cannot withstand the high temperature of 1300 ℃ ~ 1350 ℃, so they cannot be used as the bright red pigment under the surface glaze of the underglaze color. The corresponding red underglaze ceramic products can only be used as the surface color glaze and surface color of ceramics to fire ceramics with a bright red color (firing temperature is about ℃), and the unavoidable problem of this type of product is the amount of lead and cadmium dissolved Larger, making it difficult to get involved in tableware or children's products

[0006] 3. In the process of repeated practice, the existing top glaze does not match the underglaze red glaze, and the top glaze erodes the red glaze, and the fired ceramic products have color distortion, cracks, pinholes, glaze shrinkage and other glaze 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, despite the large amount of money invested by the ceramic circles all over the world, the red underglaze color has not yet been fired.