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Application of Dyes and Pigments
Ceramics Industry
The applications of different pigments on ceramics are brought in different forms. These applications are as follows:

In Coating Ceramic Materials; Ceramic Glaze; Frits- By formulating these coating applications of pigments on ceramics, the end users get attractive looking products with more durability and utility.

In Glaze development- One of the application of pigments on ceramics is to develop leading glazes for various whiteware ceramics. These include sanitary ware, tile, dinnerware etc.

In preventing Ceramics Corrosion and color fading- In this process, by applying pigment coating and protective layer with other kind of chemicals, the corrosion of the metals can be prevented. The lasting effect of colors also increase.

In developing Ceramic Pigments- These special kind of ceramic pigments can be developed with the help of other pigments and ceramic powder.

For enforcing the different applications on ceramics, various kind of special pigments are available. How much of which pigment will have to use depends upon the desire color intensity. But, the quantity of pigments that is used for these applications can vary from 1% to 10%. this variation does not make any noticeable impacts on the substances. Enamel (colorful) can be produced by coloring the melt during manufacturing. Enamel can be also generated by mixing coloring stains during the milling process.

Coloring process of Ceramic products

To color ceramic products and glass products, heavy metal oxides are either dissolved in the ionic coloration (melts) or can be incorporated into the melt like pigments or pigmentation process can be adopted. On several factors, the coloring effects of the pigments and stains depend. These factors are: nature of the raw materials, the firing temperature, dwell time and kiln atmosphere. For coloring the sanitary ceramics, a number of inorganic pigments are required.

Some important pigments for ceramics

Cadmium, Tin-Oxide, Nickel-hydroxycarbonate, Ceramic Glaze Pigments etc., are the some other important pigments that are used for ceramics. Cadmium pigments provide a wide range of rich color to the ceramics, like red, orange and yellow. Cadmium pigments are highly resistance to heat and pressure and very less soluble. So, these pigments are exposed to high temperature or pressure during the application process to ceramics.

Tin oxide pigments are versatile materials for ceramics. The thermal stability and chemically inert nature of tin oxide enable it to generate a board palette of durable ceramic colors.

Cobalt as a pigment for ceramics

The color imparting capacity of cobalt containing minerals is very old. It has been utilizing as a pigment from the ancient period. This property of cobalt has been used in glass, ceramics, paints, inks, porcelain etc. But, as a pigment, cobalt is more famous for ceramics. Some unique properties, those are present in cobalt, have make it the most widely applicable pigment for ceramics. These unique properties of cobalt are: solubility, stability, coloring effects etc.


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