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DMS SEALS TECHNOLOGY CO.,LIMITED

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Commonly used materials and properties of mechanical face seals

by:DMS Seals     2022-02-14
The sealing performance and service life of the mechanical seal are related to the material of each zero mechanical seal, especially the material of the end face seal (friction pair). For this reason, we have summarized the following commonly used friction pair materials, namely tungsten carbide alloy, graphite, The material properties of ceramics and surfacing cemented carbide are as follows.



1. Tungsten carbide alloy: It is made of metal carbides with high hardness and high melting point such as tungsten carbide and titanium carbide, which are pressed and sintered by powder metallurgy with a binder. The advantage is that the hardness and strength are very high. Wear resistance, high temperature resistance, corrosion resistance, low coefficient of linear expansion, the disadvantage is that it is brittle and difficult to process. Tungsten carbide is the most widely used auxiliary material for end face seals.



2. Graphite: The advantages of graphite are good corrosion resistance and self-lubrication, small friction coefficient, good thermal shock resistance and easy processing. The disadvantage is that the mechanical strength is low and there are pores. These two shortcomings of graphite can be improved by impregnation and carburizing. Impregnated graphite can be divided into two types: impregnated resin and impregnated metal. Resin-impregnated graphite has good corrosion resistance, but not high temperature resistance (temperature resistance is about 170-200℃); impregnated metal graphite has good temperature resistance (high temperature resistance of immersed bronze, aluminum, lead, etc. can reach 400~500℃), but corrosion resistance Bad sex. Graphite is the most widely used non-metallic material, used as the dynamic ring of low-speed mechanical rod seal and the static ring of high-speed mechanical seal. Good graphite is dense to the naked eye, and the fingers are not powdered or blackened.



3. Ceramics: The advantages of ceramics are good corrosion resistance, high hardness, and good wear resistance. The disadvantage is that they are brittle and hard to process. The most common applications are alumina ceramics and cermets. Ceramics are mostly used in corrosive media, medium and low speed occasions.



4. Hardfacing hard alloy: hardfacing hard alloy on the sealing surface of carbon steel, chromium steel and chromium-nickel steel, the advantages are high hardness, good wear resistance, good temperature resistance (below 500 ℃) , Good corrosion resistance or cavitation, the disadvantage is that it is easy to produce pores, slag inclusion and uneven surface hardness.


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