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Silicon carbide (SiC), also known as carborundum, is a semiconductor containing silicon and carbon.
The characteristics of the elastic modulus and thermal expansion are given by the characteristics of the SiC crystal itself, and the thermal conductivity or thermal diffusivity of the silicon carbides tends to be substantially higher than those of the other structural ceramics. The combination of a high elastic modulus and moderate coefficient of thermal expansion makes the SiC susceptible to thermal shock damage. The resistance to thermal shock is significantly lower than that of silicon nitride, but higher than the structural zirconia ceramic. The behavior before thermal shock is also very dependent on the application. For example, very rapid temperature changes can lead to a preference for Si3N4 over SiC, while for moderate rates of temperature change the high thermal conductivity of SiC can lead to better performance.
The new multi-phase silicon carbide ceramic is made of silicon carbide as the main raw material, through reasonable particle assembly, adding silicon powder, alumina powder and binder, and then kneading, molding, drying and high-temperature sintering. It has excellent properties such as high hardness, good wear resistance, thermal stability and chemical corrosion resistance, especially it is insensitive to abrasive angle of attack. The new multi-phase silicon carbide ceramic is affixed as an lining material or embedded in the surface of related equipment, which can greatly improve the wear and corrosion life of the equipment. The abrasion resistance of the wear-resistant particles is three times that of alumina (corundum) ceramics and five times that of high-alloy wear-resistant cast steel. Therefore, it is widely used in thermal power, coal, mining, metallurgy, chemical, cement, port and other fields, and is currently a cost-effective wear-resistant material.
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