Magnesium oxide is a fairly common basic oxide and is the main raw material for the production of magnesium hydroxide and magnesium metal. In ceramic material applications, magnesium oxide is also quite popular within the field of advanced ceramics due to its high melting point of 2800°C and some special excellent properties, it can be sintered directly into magnesium oxide ceramics or used as an additive.
Magnesium oxide powder preparation
The preparation of magnesium oxide is divided into brine-ammonia precipitation method, dolomite carbonation method, magnesium salt pyrolysis and rhodochrosite pyrolysis method. Preparation, raw materials originated from minerals or seawater, MgO from minerals or seawater, mostly made into magnesium hydroxide or magnesium carbonate first, then decomposed into MgO by calcination, this MgO can get high purity MgO by further chemical treatment or heat treatment, if required to have high purity MgO ceramics, it can not use the method of adding additives to promote sintering and grain growth, but use the activation Sintering method, i.e. Mg(OH)2 is calcined at a suitable temperature to obtain activated MgO with many lattice defects, is used to manufacture sintered MgO ceramics.
Magnesia ceramics
(1) MgO transparent ceramics
MgO transparent ceramic has good transparency and infrared transmittance, it is an optically isotropic body with good resistance to alkali metal vapor corrosion, high melting point, high thermal conductivity, small theoretical density, high insulation and high infrared transmittance. It has a wide range of applications in the field of visible and infrared light-transmitting materials, and its performance is better than that of alumina ceramics.
Typical applications: It is an important material for...
Comments