Sintering technology of alumina ceramics
       The technical method of densifying granular ceramic body and forming solid materials is called sintering. Sintering is the method of removing the void between the particles in the body, removing a small amount of gas and impurities and organic matters, so that the particles grow and combine with each other to form new substances.
       The electric furnace is widely used in the heating device for firing. In addition to atmospheric pressure sintering, that is, pressureless sintering, there are also hot pressing sintering and hot isostatic pressing sintering. Although the continuous hot pressing sintering can increase the output, the cost of equipment and mould is too high. In addition, due to the axial heating, the length of products is limited. The high temperature and high pressure gas is used as the pressure transfer medium in the hot isostatic pressure sintering, which has the advantages of uniform heating in all directions, and is very suitable for the sintering of complex shaped products. Due to the uniform structure, the properties of the material are 30-50% higher than that of cold pressed sintering. It is 10-15% higher than that of conventional hot pressing sintering. In addition, microwave sintering, arc plasma sintering and self propagating sintering are also under development.