The importance of thermal conductivity of mechanical seal materials-

The importance of thermal conductivity of mechanical seal materials

　2017-02-08　　

The thermal conductivity of mechanical sealing materials is also one of the main factors that determine the performance of the sealing materials. Good thermal conductivity can take away more frictional heat from the moving seal, lower the temperature, reduce temperature deformation, and ensure the reliability of the seal.

For high temperature sealing materials, it should have the advantages of high thermal strength, good creep resistance, high relaxation resistance, high durability and good corrosion resistance. The working conditions of the sealing device working at high temperature are quite special. As a commonly used sealing material-metal for high temperature sealing, after creep occurs, the higher the temperature, the more severe the leakage. Generally, in the contact type sealing device, the extreme value of the allowable use temperature of the sealing tree material is not only limited by the heat resistance, but more importantly, it is restricted by the extreme value of the allowable deformation at a certain temperature. At present, the commonly used high-temperature sealing material cermet has comprehensive characteristics of chemistry and thermodynamics. The asbestos-based packing and sealing material still has good thermal stability at high temperature of 770^ (493 degrees). For composite sealing materials, the key to use at high temperatures is that the coefficient of thermal expansion should not be too large, and too large linear dimensional changes are one of the main reasons for such sealing materials to cause sealing failure. For polymer sealing materials, the main disadvantage is poor thermal stability. Since the 1970s, the research and development of heat-resistant polymer sealing materials has attracted people’s attention. Its main research direction is filling and reinforcing the matrix of silicone polymers and heterochain polymers. The commonly used components are mainly glass. Fiber, carbon fiber, boron fiber, etc. The currently developed asbestos plastics and graphite plastics can be used at temperatures as high as 570K. The limit working temperature of fluorine rubber can reach 600K (327 degrees), and the working temperature of long-term use can reach 5501K.　　258.html,

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