SURFACE STRENGTHENING AND FRICTION WEAR OF THE INNER WALL OF LIQUID SODIUM HYDROSTATIC BEARING

Abstract

Sodium hydrodynamic bearings are parts which are easy to wear in order to improve the wear resistance of the inner wall and prolong the service life. In this paper, high-temperature element W was used as a variable to prepare cobalt-based alloy coatings with different contents of W. By testing the hardness and anti-wear performance of the coatings at high temperature, the microstructure and wear mechanism of the coatings were further analyzed in combination with crystal phase diagram and microscopic morphology diagram. The results show that the coefficient of friction of cobalt-based alloy coating decreases with the increase of W content under high-temperature dry rubbing, while the wear quantity increases with the increase of W content. Under high-temperature oil lubrication, the coefficient of friction of cobalt-based alloy coating is the lowest when the W content is 12%. The wear amount of cobalt-based alloy coating decreases with the increase of W content, and the wear mechanism changes from adhesion wear to abrasive wear with the increase of W content.