Selection of Mechanical Sealing Materials

The importance of sealing design has been widely recognized by machinery, aviation, automobile and other industries. It often costs a lot of money to replace the failed sealing elements. Therefore, millions of pounds of processing equipment has to be shut down. In many applications, mechanical seal can ensure to prevent leakage of harmful substances. Another main aspect of sealing design is energy consumption, because the friction of seal mechanism will consume a large part of energy. For each sealing occasion, a pair of matched friction pair materials can provide the longest service life and the lowest working cost. Therefore, it is necessary to consider all kinds of inlay materials of sealing groove and the same number of matching table materials. Matching the appropriate materials can easily increase the service life of sealing materials by multiple times. Because the wear factor in use can be controlled.

Silicon carbide is a kind of carbon sealing material with self-lubricating, chemical inertness and low cost. In most cases, it is necessary to polish the surface properly for application, because a very flat and smooth surface is conducive to prevent leakage. According to the different sealing types, reasonable assembly is also necessary. For example, put a carbon ring on the main dubbing surface or install the carbon part at the sealing end during assembly. In other forms of seal, carbon parts are combined with cage, disc and spring in the form of loose parts, just like O-ring in secondary seal. Carbon mechanical seal series has wear resistance in a wide range. For products with soft and low hardness brands, they should be matched with relatively soft metals. The brands with better wear resistance of hard ones are suitable for sealing media with hard points.