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Some Properties and Applications of Reaction bonded Silicon Carbide

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Reaction bonded Silicon Carbide is made of quartz sand, calcined petroleum coke (or coal coking), wood residue (the production of green silicon carbide manufacturing needs to be added to edible salt) and other raw materials, through the electric heating furnace sustained high-temperature smelting plant into.
Reaction bonded Silicon Carbide performance:
1, the thermal conductivity and thermal expansion coefficient of silicon carbide. As a refractory material, carbonized brick has excellent heat shock resistance. This is mainly manifested in its strong thermal conductivity (heat transfer coefficient) and relatively low coefficient of thermal expansion.
2, the conductivity properties of silicon carbide ceramic. Silicon carbide is a semiconductor material, its electrical conductivity properties with the introduction of impurities in the crystallization of the type and number of different and change. In which the conductivity of silicon carbide has a greater impact on the residue is aluminum, nitrogen and boron, more aluminum-containing silicon carbide conductivity increased significantly.
3, the resistance of silicon carbide. Silicon carbide ceramic resistance changes with the change of temperature, but within a certain temperature range and metal resistor temperature characteristics in turn. The relationship between the resistance of silicon carbide and temperature is more complicated. Reaction bonded silicon carbide conductivity with the temperature rises to a certain value after the occurrence of high values, and again rise in temperature, the conductivity will fall again.

The usefulness of silicon carbide:
1, wear-resistant materials – the main used to make sand wheel blade, grinding sandpaper, whetstone, grinding wheel, grinding paste and photovoltaic products in the photovoltaic cell, photovoltaic cell and the components of the surface grinding, grinding and polishing.
2、High-end refractory materials – can be used as deoxidizer and corrosion-resistant materials in metallurgical industry, and made of prefabricated components and fixed parts of sustained high-temperature kiln.
3, functional ceramics – not only can reduce the volume of the kiln, but also improve the quality of industrial kiln products, reduce cycle time, is the ideal indirect material for ceramic glaze baking sintering.
4, rare metals – iron and steel enterprises, metallurgical industry beneficiation plant field, have some use.
Silicon carbide because of smooth organic chemical properties, high heat transfer coefficient, small coefficient of linear expansion, good wear resistance, in addition to wear-resistant materials, there are a number of other major uses, such as: a new process of silicon carbide powder sizing in the water turbine centrifugal impeller or the inner cavity of the cylinder body, which can improve the wear-resistant properties and increase the period of use of 1 to 2 times; used to make high-level refractory materials, high-temperature resistance to heat shock, small, lightweight and strong. It is small in size, light in weight and strong in strength, and has obvious effect of environmental protection and energy saving. Low-grade silicon carbide (containing about 85% SiC) is a very good deoxidizer, used to accelerate the rate of ironmaking, which is conducive to improving the quality of steel. In addition, silicon carbide is also used to make silicon molybdenum rods, which are used as electric heating materials.