Performance characteristics of magnesium oxide ceramics

MgO ceramics are cubic crystal system, sodium chloride structure. The main crystalline phase of MgO ceramics is MgO, theoretical density is 3.85g/cm³, melting point reaches 2800℃, Mohs hardness is 5-6. Magnesium oxide is a weak alkaline material, with strong resistance to erosion of alkaline metal solutions. The ion stacking density in the magnesium oxide lattice is tight, the ion arrangement symmetry is high, the lattice defects are few, and it is difficult to sinter. So in the preparation of magnesium oxide ceramics, in order to reduce the sintering temperature, it is necessary to add a certain amount of sintering aids, generally mixed rare earth metal oxides (RxOY), TiO2, ZrO2, SiO2 as sintering aids. The high temperature stability and corrosion resistance of MgO ceramics are better than alumina ceramics, and can be used in strong alkali metal corrosive environment.