Silican Carbide Mechanical Seals
Silicon carbide is the ideal sealing material. It has good corrosion resistance, higher mechanical intensity, excellent resisting wear ability and high temperature, good self-lubricity and making-group, low friction factor, good heat-conduction and so on. Therefore, silicon carbide mechanical seals also possess the property of excellent resistant-corrosion, high mechanical strength, high thermal conductivity and good self-lubrication. Silicon carbide seals are widely used in many different industries, including spacecraft, machinery, metallurgy, printing and dyeing, foodstuff, pharmaceutical, auto industry etc.
Why make from silicon carbide?
Silicon carbide is a more expensive seals material with the carbon, but it is often used in more demanding applications. For example, blistering is a critical concern with carbon bearing materials. Strangely, the reason why blistering sometimes occurs is not known for certain. The most popular explanation is that a certain amount of material becomes absorbed in the carbon substrate and expands because of frictional heat, thus creating a crater in the seals face. Blistering is most often found in applications involving heavy oils. In some cases, the use of silicon carbide as a mating surface will eliminate a blistering problem.
|Silicon Carbide (SiC) physical property|
|Content of Sic||%||≥90||≥98||≥85||≥92||≥90|
|Coefficient of Heat Expansion||10-6/°C||4||4.2||3.50||3.00||2.50|
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