Introduction of Magnesium Oxide Ceramics

Magnesium oxide is main component of magnesium oxide ceramic, which is belongs to the cubic crystal system, NaCl structure. Pure magnesium melting point is 2800 ℃±13 ℃. Mohs hardness is 6, tensile strength, compressive strength and bending strength are much lower than the sintering Al2O3. Its high temperature strength is also low. MgO is a good insulator, room temperature resistivity Ω > 1014 cm. With the temperature increases, resistivity reduced sharply. Magnesium oxide ceramic is a typical basic refractory, can work stable to 2400 ℃ under oxidizing atmosphere or nitrogen protection. MgO will break down in the reducing atmosphere, in the form of metal magnesium volatile, began to a large number of volatile in the 1600 ℃ in a vacuum. Magnesium oxide ceramic can be used for smelting metal crucible, in the atomic energy industry also is suitable for smelting high purity of uranium and thorium. Also can be used as a thermocouple protection tube. Using it can make the nature of the electromagnetic wave through the cover, it is used for radar and infrared radiation transmission window material, etc.