Product Description:
Ceramic pigments are a general term for pigments used on ceramics, including over-glaze, under-glaze pigments, as well as those for coloring glazes and ceramic bodies. Below is a detailed introduction to them.
Composition: Ceramic pigments mainly consist of color-developing metals and their compounds, along with matrix raw materials. Common color-developing metal elements include iron, cobalt, manganese, chromium, vanadium, and titanium.
Properties: They possess properties such as heat resistance, corrosion resistance, and non-toxicity. Their internal structure is dense, with high density and good color stability, making them less prone to discoloration.
Classification by Application Method: They can be divided into over-glaze pigments, under-glaze pigments, and in-glaze pigments. Under-glaze pigments require high-temperature firing above 1300°C and have strict stability requirements, such as blue and white porcelain pigments and under-glaze red pigments. Over-glaze pigments only need to withstand temperatures of 600-800°C, with a wide variety and rich colors. The firing temperature for in-glaze color pigments ranges from 1100°C to 1260°C.
Classification by Mineral Phase: They can be categorized into simple compound type, solid solution-oxide type, silicate type, etc. The simple compound type includes cadmium yellow (CdS), among others. The solid solution-oxide type covers chrome-aluminum pink, vanadium-zirconium yellow, etc. The silicate type includes cobalt pink, vanadium-zirconium blue, and so on.
Mixing: Raw materials with the same mass are accurately weighed and mixed according to their composition to ensure consistent color tone of each batch of pigments.
Calcination: This is a crucial process in pigment production, aimed at stabilizing the pigments. The minimum calcination temperature must be the same as the service temperature of the final pigment products.
Water Washing: After calcination, the pigments are crushed and then washed with water to remove all soluble substances.
Crushing: After water washing, wet crushing is carried out using a pan mill or ball mill to the required fineness. Generally, all pigments are required to pass through a 300-mesh sieve.
Functions: They can be used for coloring ceramic bodies to make the fired bodies show a certain color. They are also used for coloring glazes to prepare various colored glazes and artistic glazes. Additionally, they can be used for drawing patterns, such as hand-painted decoration, decal paper application, and screen printing.
Applications: They are mainly applied in fields such as ceramics, enamel, and architectural enamel panels. They can also be used for coloring heat-resistant coatings and outdoor plastic products.
Red: Such as zirconium-iron red, agate red, etc.
Yellow: Such as vanadium yellow, vanadium-zirconium yellow, etc.
Blue: Such as cobalt blue, peacock blue, etc.
Green: Such as chrome green, peacock green, etc.
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