Talk about the types and uses of red ceramic pigments

Red is a very special color, regardless of our blood is red, look at the colors around us, red, yellow and blue are the basic colors of life, while for ceramic pigments, blue is relatively easy to develop. Common blue colors include vanadium zircon blue, cobalt blue, malachite blue and sapphire blue. Their structural types are zircon, spinel and spinel respectively; yellow ceramic pigments are relatively rich in products, mainly orange and pure yellow of titanium series; golden and brown of iron-chromium-zinc-aluminum series. Zircon structure of praseodymium yellow, package yellow and so on.

Ceramic colorants are roughly divided into two types according to the use of glaze and green body. Most of the glaze colorants have hair color in the green body, but the green body colorants do not necessarily have hair color in the glaze. The main varieties of color materials for red ceramic glaze are: zirconium iron red, package red, round red, manganese pink, etc. Among them, zirconium iron red and package red belong to zircon structure type, and have good hair color in both blank and glaze, especially package red hair color is bright and red value is high. Although the price is high, it is generally used on glass mosaic, glazed porcelain and artistic porcelain. Due to the relatively low price of zircon red, it can also be used with other zirconium-based colorants to match other rich color ranges, as well as better high temperature performance, and is widely used in matte glazes and tiles.

Yuanzi red, also known as tin pink, belongs to the tin sphene structure, mainly by chromium oxide, tin oxide and calcium oxide firing system, the product formula high degree of confidentiality, complex production process, raw material selection and process is very particular, at present also basically in Guangdong Chaozhou area production is better. Before, I heard that Chaozhou manufacturers prepared raw materials and the same raw materials and processes according to the original formula after setting up factories in Foshan. However, when they came to Foshan, they could not burn the original effect. It is even more said that the production water is also exquisite. In addition, the introduction method of calcium oxide in the formula is generally calcium bicarbonate or calcium oxide, but Chaozhou is said to be crushed by oyster shells, then melt and stir-fry with tin oxide ingots in a large pot, the process is both primitive and mysterious. The oranges extend from pink to deep purple according to the content of chromium oxide and calcium oxide in the formula. At present, round red products have also been used in the production of ceramic pink ink, and glazed tiles are also large users.

Manganese pink is not very good at high temperature because it contains manganese carbonate, and it is easy to cause pinholes due to the presence of unreacted manganese carbonate in the ceramic tiles. Therefore, manganese pink for glaze is basically used in matte antique brick products.

The green body with red ceramic pigment products are mainly: aluminum-iron structure of coral red, silicon iron red, yttrium aluminum red, manganese red and so on. The development of aluminum iron red can be said to be a miracle, because this variety is said to have been developed by mistake in an inadvertent experiment, and it is also said that the miracle was caused by mistakenly putting alumina into the ball as chemical zirconia when preparing raw materials. Of course, the above statements are all legends in the Jianghu, but the first technical colleague who made coral red products still admired the same technician.

Ferrosilicon red is mainly prepared by calcining white carbon black and iron oxide red. Its hair color is brighter than aluminum iron red and its pink tone is stronger. Natural products include 510B sirite from France. Because the price of silica is several times higher than alumina, the current market is basically using low-cost aluminum iron red products.

Manganese red products belong to corundum combined type, in the body of the high temperature resistance in general, due to the low price of alumina and manganese carbonate raw materials, it is also a relatively low price of pink ceramic body pigment varieties. At present, manganese red products are rarely used in the market, and their market share was relatively objective around 2004. Due to the decrease in demand, few non-ferrous materials manufacturers are currently producing them, and they are basically monopolized by one or two color materials enterprises.