Why does the density of alumina ceramics change

In the ceramics industry, the development is getting faster and faster, and many enterprises are becoming larger and the quality of their products is also getting better due to the production of ceramics. Aluminum oxide ceramics, as one of them, have become increasingly mature in manufacturing technology. They can actually be divided into two categories. One is ceramics with very pure aluminum oxide content, whose sintering temperature can reach 1800 ℃. The material made in this way can even replace platinum and be used as insulation material.

And the other type is the ordinary type, which is classified according to the content of alumina, mainly used in our daily life, such as making high-temperature resistant crucibles, making ceramic valve plates, bearings, etc. The density of alumina ceramics is affected by the properties of alumina itself.

In chemistry, this is a compound, but in terms of process, it can only be used as a material because it also contains many impurities and is not pure alumina. It is well known that alumina has a relatively high hardness and is a amphoteric oxide that is prone to reactions and ionization, making it an excellent choice for making refractory materials. When making ceramics, high temperature sintering is also required, so choosing alumina as a compound can avoid being burned out halfway.

After the formation of alumina ceramics, the step of high purification begins, but the density always fails to meet the requirements. At this time, it can be considered whether it is a problem with the original powder and formula. If there is no problem at the root, methods such as increasing pressure and sintering temperature can be used. However, during high purification, do not extend the insulation time, as it may cause deformation of the grains inside the alumina. In theory, it is required that the grains be uniform so that its structural composition is good enough.