CaO, MgO, SiO2 and transition metal and rare earth metal oxides are commonly used as additives in 95 porcelain. It can be fired at a lower temperature, and there are generally 10% (volume) glass phase and subcrystalline phase in the microstructure. In the CaO-AI2O3_ _SiO2 system phase diagram, the lowest eutectic phase temperature is 1495 ° C. When the ratio of SiO2/CaO in the porcelain composition is <2.16, the minerals that coexist with corundum are anorthite and calcium hexaaluminate; and when SiO2/CaO>2.16, corundum will coexist with mullite and anorthite. The advantages of the MgO-AI2O3-SiO2 system are good acid resistance and fine grains in the structure, but the sintering temperature is Read more