What material is ceramic glaze?

Glaze is a silicate. Generally speaking, the glaze on ceramics is made of quartz, feldspar and clay. After grinding and adding water, it is coated on the surface of the green body and baked at a certain temperature and then melted. When the temperature drops, a glassy thin layer is formed on the ceramic surface.

It can increase the mechanical strength, thermal stability and dielectric strength of ceramics and prevent the corrosion of liquids and gases. Glaze also has the function of increasing the beauty of porcelain, being easy to wash and wipe, and not being stained with dust.

What are the materials of glaze?

1. All raw materials used for raw glaze are directly mixed with water without premelting.

2. Before the frit glaze is slurried, some raw materials are melted into glassy substances, quenched into small pieces (frits) with water, and then mixed with other raw materials and ball-milled into glaze slurry.

3, salt glaze This kind of glaze does not need to be prepared in advance, but when the product is calcined to a high temperature, the salt is put into the kiln, and the volatile matter of the salt forms a thin layer of glass on the surface of the blank.

4. Earth glaze This kind of glaze is a natural colored mud that is directly used as glaze after elutriation.

5. Feldspar glaze This kind of glaze is mainly made of timely, feldspar, lime and clay. It is characterized by high hardness, strong luster, transparency, softness and wide firing range.

6. Lime glaze This glaze is mainly calcium oxide, and the number of molecules of calcium oxide accounts for more than half. Lime glaze has good elasticity and strong luster, and can also be fired into dull glaze and opaque glaze. Its disadvantages are narrow firing range and easy smoking of products.

7. Lead glaze This part of the glaze uses lead oxide as a flux and is often used together with boron oxide to strongly reduce the melting temperature of the glaze. The biggest advantages of lead and lead-boron glazes are strong glossiness and good elasticity, which can be applied to a variety of green bodies and can enhance the coloring of colored glazes. But considering the harm of lead poisoning, it is still used as little as possible at present.