Aero-engine compressor blade repair coating and preparation method thereof

Abstract

The invention discloses an aero-engine compressor blade repair coating and a preparation method thereof, and belongs to the technical field of compressor coating processing. According to the aero-engine compressor blade repair coating, a bottom layer adopts combination of Ni60 and rare earth oxide powder, generation of defects in the bottom layer can be improved, and a good cladding foundation is laid for a bonding layer, a transition layer and a surface layer; the bonding layer, the transition layer and the surface layer adopt a step-by-step cladding mode, so that the residual stress in the cladding layer is effectively reduced, the performance of the cladding layer is improved, and various defects caused by the residual stress are reduced; meanwhile, the specific gravity of rare earth elements is gradually increased, and the service life and performance of the coating are further improved; according to the method, optimized control is carried out on three-layer process parameters of the bonding layer, the transition layer and the surface layer, the forming quality and defect optimization of the cladding layer are effectively controlled, high-energy laser quenching is further adopted when cladding is completed, the residual stress in the cladding layer is further released, and crystals are refined; and oxygen permeation treatment is adopted after cladding of the surface layer, and an oxygen permeation layer is formed on the near surface of the surface layer, so that hardness and wear resistance are improved.

Description

technical field [0001] The invention belongs to the technical field of compressor coating processing, in particular to an aeroengine compressor blade repair coating and a preparation method thereof. Background technique [0002] Compressor blades are one of the three key components of the core machine of an aero-engine. They have high requirements on structural fatigue strength, and titanium alloys are widely used. The parts in the aero-engine are in the extreme environment of high temperature, high speed and high pressure when the engine is running, so its structural materials are required to have corresponding performance characteristics of high temperature resistance, fatigue resistance and high pressure resistance. Due to the strong notch sensitivity of titanium alloys, microcracks will expand rapidly under the joint action of local tensile stress and working load after foreign objects are damaged, resulting in premature fatigue fracture, seriously affecting engine relia...

AI Technical Summary

Problems solved by technology

Due to the strong notch sensitivity of titanium alloys, microcracks will rapidly expand under the joint action of local tensile stress and working load after being injured by foreign objects, resulting in premature fatigue fracture, seriously affecting engine reliability, and even endangering flight safety.