The invention discloses a low-shading high-contrast reddish brown
colored drawing porcelain
glaze and a preparation method thereof, and belongs to the technical field of inorganic non-
metallic materials. The porcelain
glaze comprises the following components in percentage by
mass: 20%-30% of
quartz, 20%-35% of
feldspar, 8%-15% of
calcite, 15%-25% of kaolin, 15%-25% of pre-sintered iron-rich clay, 0.5%-1.0% of
sodium carboxymethyl cellulose and 0.2%-0.5% of
sodium tripolyphosphate. Wherein the pre-sintered iron-rich clay is prepared by pre-
sintering natural iron-rich clay at 700-900 DEG C, and the content of Fe2O3 is 5%-8%. The preparation method comprises the following steps: pre-
sintering the iron-rich clay, mixing the pre-sintered iron-rich clay with other
glaze raw materials, carrying out ball milling to obtain glaze slip, applying the glaze slip to a glaze blank, preheating, and carrying out heat preservation
sintering in an oxidizing
atmosphere of 1180-1220 DEG C. The iron element
crystal form is stabilized through pre-sintering treatment, a specific glaze formula and an optimized sintering
system are combined,
anorthite microcrystals which are decomposed and promoted by
calcite are used for wrapping alpha-Fe2O3
colored particles, iron
ion migration is effectively inhibited, the technical problems that traditional reddish brown
colored drawing patterns are blurred, and boundaries are blurred are solved, and the service life of the reddish brown colored drawing is prolonged. And the high-quality colored drawing porcelain with bright and saturated color,
high contrast ratio and clear pattern is obtained.