The application of thermal spray processing in mechanical seals

       A mechanical seal is a shaft seal device of a rotating machine, also known as an end face seal, which is a device that prevents the leakage of the medium. Mechanical seals are used in many industries.



Due to its special properties, its technical requirements are also relatively high, such as: it needs to have sufficient strength and stiffness, and it can still maintain sealing when working conditions fluctuate; it also needs to have good thermal shock resistance, When choosing the material for production, it is necessary to choose a high thermal conductivity and a small linear expansion coefficient, so that it will not crack when subjected to thermal shock; in addition, the friction coefficient should be small, and it must have good self-lubricating properties. This series of special properties not only requires relatively high requirements on the production technology, but also in the case of damage to the workpiece, the surface repair technology must also meet the requirements of the working conditions. Therefore, the thermal spraying process is widely used in mechanical sealing workpieces. promotion.

The basic principle of the thermal spraying process is to prepare a layer of metal coating with protective function on the surface of the workpiece according to the different requirements of the workpiece to achieve the effect of repair and protection. Due to the special requirements of mechanically sealed workpieces, the use of thermal spraying technology to prepare metal coatings can not only improve the surface strength and hardness of the workpiece to ensure its sealing performance, but also prepare coatings with higher corrosion resistance, wear resistance, and high temperature resistance.

The metal thermal spraying process can not only repair the surface of the damaged workpiece, but also prepare a metal coating on the surface of the new workpiece to create a new type of protective clothing for it, improve the surface strength and prolong the service life, which is also the thermal spraying process is widely used in the machinery industry. main reason.