Dr. Dmitri Kopeliovich
Silicates are materials composed generally of silicon and oxygen.
The following groups of materials relate silicate ceramics:
Technical Porcelain generally consists of silica (SiO2) and alumina (Al2O3). The natural ingredients of these components are quartz, feldspar, soapstone and clay (kaolin).
Depending on the proportion of silica and alumina in material composition two types of porcelain may be prepared: quartz porcelain or alumina porcelain.
Alumina porcelain contains higher amount of more expensive alumina and possesses higher mechanical strength, than silica porcelain.
The following characteristics are typical for Technical Porcelain:
Magnesium Silicates (Steatite and Cordierite) consist of silica (SiO2), magnesia (MgO) and some alumina (Al2O3).
The natural ingredients of Magnesium Silicates are soapstone, clay, corundum, mullite.
The process of steatite ceramic preparation:
The following characteristics are typical for Steatite:
Steatite is used in heat engineering and in electrical engineering for manufacturing sockets, control housings, insulating beads, low-voltage power fuses and base plates
The following characteristics are typical for Cordierite:
Cordierite is used mostly in heat engineering for manufacturing supports of heating elements, parts of water heaters, pipes of heating element, gas heater inserts, spark protectors and catalyst carriers in automobiles.
Mullite Ceramics consist of mullite (3Al2O3*2SiO2), alumina (Al2O3) and glass (SiO2).
Sintered Mullite Ceramics have porosity up to 10%, which may be considerably reduced by increasing the content of glass phase above 10%.
The following characteristics are typical for Mullite Ceramics:
Mullite Ceramics are used for manufacturing high temperature parts, kiln furniture, slide gates, ladles for molten metal, protection tubes for thermocouples, glass industry refractories.