Ceramics is a general term for pottery and porcelain. As early as the Neolithic Age about 8,000 years ago, people invented pottery. Common ceramic materials are clay, alumina, kaolin and so on. Ceramic materials generally have high hardness, but poor plasticity. Besides being used for utensils and decorations, ceramics also play an important role in the development of science and technology. Ceramic raw materials are the earth's original resources, clay, which is quenched. Clay is tough, plastic when it meets water at room temperature, carved when it is slightly dry and grindable when it is completely dry; Fired to 700 degrees, pottery can hold water; When it is fired to 1230℃, it becomes porcelain, which hardly absorbs water, and is resistant to high temperature and corrosion. The flexibility of its use has various creative applications in today's culture and technology. Invented pottery. Ceramic materials are mainly oxides, nitrides, borides and carbides.