Wear-resisting foil type dynamic pressure thrust gas bearing and manufacturing method

Abstract

The invention relates to a wear-resisting foil type dynamic pressure thrust gas bearing and a manufacturing method. The gas bearing is composed of bottom plates, wave foil and top fold, and the top foil is made of nickel-base superalloy. The top foil is coated with a nickel package graphite micro particle lubricating coating, the thickness of the coating is 0.050 mm to 0.055 mm, the mass fraction of nickel and graphite in nickel package graphite micro particles is 5 to 8:5 to 2, and the granularity of the nickel package graphite micro particles is 60 micrometers to 80 micrometers. The spraying process of the nickel package graphite micro particle lubricating coating of the top foil comprises the steps that (1) particles in the nickel package graphite micro particles are put into an oven to be dried for two hours to four hours at the temperature of 150 DEG C; (2) the top foil is put into an ultrasonic cleaning machine to be cleaned for 5 minutes to 20 minutes, and is preheated to 150 DEG C to 180 DEG C; (3) the nickel package graphite micro particles are sprayed on the upper surface of the top foil through an oxygen-acetylene flame powder spraying method. The nickel package graphite micro particle lubricating coating is sprayed on the surface of the top foil, and the start-stop service life of the foil type gas bearing is prolonged. The oxygen-acetylene flame powder spraying method is utilized for spraying, and the wear-resisting foil gas bearing meeting the quality requirement can be manufactured.

Description

technical field [0001] The invention belongs to the technical field of gas bearing equipment, and relates to a foil type dynamic pressure thrust gas bearing, in particular to a wear-resistant foil type dynamic pressure thrust gas bearing and a preparation method thereof. Background technique [0002] Foil bearings first appeared in 1928. Foil bearings have the advantages of good stability, vibration resistance, impact resistance, and no pollution to the environment. Foil thrust bearings appeared in the 1970s and have been widely used in various high-speed rotating machinery, and achieved good application results. Foil type dynamic pressure thrust gas bearing is a bearing with infinite life in theory. According to the principle of dynamic pressure bearing, it can be known that during high-speed rotation, the bearing is supported on the gas film generated by itself, so it will not occur Wear, but in the process of starting and stopping, there will be friction between the top ...

AI Technical Summary

Problems solved by technology

Existing solid lubricating coatings, such as traditional graphite, PTFE, MoS etc. Some effects have been achieved in applications below 300°, but they still cannot meet the life requirements of more than 20,000 starts and stops required under certain working conditions.

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