MAIN FEATURE :
1、The chemical properties
(1) oxidation resistanceWhen the silicon carbide materials when
heated to 1300in air in the silicon carbide crystal surface to
start generating the protective layer of silicon dioxide. With the
thickening of protection layer, prevent the internal oxidation
silicon carbide continue to be, that make the silicon carbide has
good oxidation resistance. When the temperature is above 1900 k
(1627 ℃), silicon dioxide protective film to be destroyed,
oxidation of silicon carbide, So the 1900 k is silicon carbide in
the oxidizing atmosphere under the highest working temperature.
(2) acid and alkaliIn terms of acid, alkali, and the function of
oxide, as a result of the action of sio2 protective film, silicon
carbide strong acid resistance, alkali resistance is a bit poor.
2、The physical and mechanical properties
(1) Density:All kinds of silicon carbide crystal shape grain
density is very close, generally considered to be 3.20 g / 3 mm,
The silicon carbide abrasive nature of packing density between
1.2-1.6 g / 3 mm, it depends on particle size, particle size and
(2) The hardness:Silicon carbide mohs hardness is 9.2~9.8 , the
Williams dense microscopic hardness is 3000-3300 kg/mm 2, Knoop
hardness is 2670-2815 kg/mm, higher than in the abrasive corundum,
second only to diamond and cubic boron nitride and boron carbide.
(3)Thermal conductivityThe thermal conductivity of silicon carbide
products is very high, thermal expansion coefficient is small , the
thermal shock resistance is very high, is of high quality
Room temperature industrial silicon carbide is a kind of semi
conductor, electrical conductivity of impurities. The high purity
silicon carbide with the increase of temperature resistivity drops,
different impurities silicon carbide according to its impurity,
conductive performance is also different. Another electrical
properties of silicon carbide is electroluminescent, has now
developed a practical device.
Good hydrophilicity,far-infrared radiation,and soon.
1、The purpose of the abrasives
Black silicon carbide is produced at high temperature in an
electric resistance type furnace with quarts sand and petroleum
coke as its main raw materials. It is used for making bonded and
coated abrasive tools, grinding metal and non-metal materials of
lower tensile strength, such as gray cast iron yellow
bronze,aluminum, stone, leather, rubber, etc.
2、The chemical industry use
It can be used as modifier steelmaking deoxidizer and iron group,
can be used as manufacture of silicon tetrachloride raw material,
is the main raw material of silicone industry. silicon carbide
deoxidizer is a new kind of compound deoxidizer instead of
traditional silicon powder carbon powder for deoxidizeby comparing
the original process and the various physical and chemical
performance is more stable, the deoxidization effect is good,
deoxidize time shortened, save energy and improve the efficiency of
steel,save energy and improve the efficiency of steel, improve the
working conditions, improve the comprehensive economic benefits of
electric furnace has important value.
3. Refractory used for abrasion resistance and corrosion resistant
materials. Using silicon carbide has corrosion resistance, high
temperature resistance, strength, impact resistance and other
properties, heat conduction performance is good, silicon carbide on
the one hand, can be used for various components of smelting
furnace lining, high temperature furnaces, silicon carbide plate,
plate, supports, sagger, silicon carbide crucible, etc.
Silicon carbide on the one hand, can be used for various components
of smelting furnace lining, high temperature furnaces, silicon
carbide plate, plate, supports, sagger, silicon carbide crucible,
etc. Distillation furnace, such as vertical distillation furnace
tray, aluminium electrolyzer, copper melting furnace lining,
furnace zinc powder with arc plate, t