Questions You Should Know about red iron oxide ceramics

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Iron oxide pigments are widely used in the ceramic industry due to their wide color spectrum, tasteless, non-toxic, and inexpensive. Application of iron oxide as the raw material of the green body: the green body is the basic material for ceramics to porcelain. Iron oxide as a raw material colorant is mainly used in the construction of ceramic wall tiles. For example, for imitation granite unglazed porcelain tiles, the pigment preparation process is: iron oxide pigment and a small amount of billet are mixed into a color paste in a ball mill, and then controlled by a quantitative pump to enter the mixer, in the mixer, a certain proportion of color paste and base After the slurry is mixed into a pigment slurry at high speed, the pigment and base slurry are sprayed into the drying tower at a certain ratio to produce colored powder.

Iron oxide is used in ceramic color glaze: glaze is a continuous glassy layer attached to the surface of the ceramic. In ordinary ceramics, the coloring of iron oxide is mainly used to prepare various colors of glaze water. The price of iron ions is different, and the iron oxide itself exhibits different colors. For example, ferric oxide (Fe2O3) is red powder, ferrous oxide (FeO) and ferric oxide (Fe3O4) are black powder. Different iron oxides can be selected according to needs.

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In addition to the multi-color iron oxide itself, when iron oxide is added to other glazes, it can make the glaze hue richer and the glaze color brighter. For example, when iron oxide is added to boric acid glaze containing alkali metal, it shows the red color of wine; when iron oxide is added to semi-matte and dull white glaze, it shows bright brown, yellow gray and camel to dark brown series of hues; when When making yellow glaze for iron oxide, only a few percent of iron oxide can be added to show a very strong yellow color.

In addition, in the manufacturing process of ceramics (glaze), different firing atmospheres are used, and the color of iron oxide is also different. In the atmosphere of the oxidizing flame, the color of iron oxide changes from yellow to reddish brown, and then changes from grape red It is brown. Under a reducing atmosphere, it changes from blue to gray and dark. These changes are the result of the dynamic balance between Fe2+ and Fe3+ in the glaze layer.

The ceramic industry requires the quality of synthetic iron oxide pigments to be stable in hue and uniform in particle size. The Fe2O3 content should be high, the salt content should be low, and the density should be relatively stable. The less mechanical impurities such as sand grains and iron filings, the better. The trend of color trends from dark to light colors should be bright.

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