Coating for interstage sealing device of compressor

Abstract

The invention discloses a coating for an interstage sealing device of a compressor. The coating comprises the components in percentage by weight: not more than 35% but not zero of nickel powder with the granularity of less than or equal to 50 nm , 60-90% of graphite powder with the granularity of less than or equal to 50 nm, and not more than 5% but not zero of silicon powder with the granularity of less than or equal to 50 nm. The coating is based on the special performance requirements of the CCPP generator set gas compressor taking the byproduct gas as the fuel in domestic iron and steel enterprises on an interstage sealing coating layer; the coating enabling the gas compressor to have good erosion resistance, abrasion resistance, self-lubricating performance and corrosion resistance under the working condition of being rich in corrosive pollutants such as benzene, naphthalene, tar and sulfide is provided, and the high sealing performance of the compressor in the compression process can be guaranteed.

Description

technical field [0001] The present invention relates to a kind of coating, which belongs to a kind of coating used for compressor interstage sealing device. Background technique [0002] With the increasing development of aviation technology and the increasing shortage of energy sources, higher and higher requirements are placed on the efficiency of engines. According to data reports, in a high-pressure turbine, every time the gap between the blade and the casing is reduced by 0.13-0.25mm, the fuel consumption can be reduced by 0.5-1.0%, and the engine efficiency can be increased by about 2%. However, during the manufacture and operation of the engine, due to the thermal expansion of the engine components and the thermal deformation of the shaft, the high-speed rotation of the rotor, the blade elongation caused by centrifugal force, the tolerance of parts processing and the deviation of engine assembly, engine acceleration / deceleration and aircraft landing Due to the vibrat...

AI Technical Summary

Problems solved by technology

[0012] The compression medium of CCPP gas compressors in iron and steel enterprises is mainly the blast furnace and coke oven gas produced by iron and steel enterprises. The gas contains a large amount of corrosive pollutants such as tar, naphthalene, benzene, sulfide, water vapor and solid particles. During the compression process, the gas When the temperature rises above 500°C, traditional mid-temperature sealing coatings such as aluminum-silicon graphite and aluminum-silicon polyphenylene are processed by plasma spraying of high-resolution polymers and metal phase substances, and are more likely to be corroded during compression. Erosion, wear and oxidation make the organic active groups embrittlement, aging failure, and reduce the service life of the sealing coating