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SiC, They have the property of excellent resistant-corrosion, high mechanical strength, high thermal conductivity, good self-lubrication, used as seal faces, bearings and tubes in spacecraft, machinery, metallurgy, printing and dyeing, foodstuff, phamaceutical, auto industry and so on. When the sic faces are combined with graphite faces the friction is the smallest and they can be made into mechanical seals which are able to work in highest working requirements.
Tungsten carbide is widely used as seal faces with resistant-wearing, high fractural strength, high thermalconductivity, small heat expansion co-efficient. It is the best material to resist heat and fracture in all hard face materials.