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Titanium alloy blade mid-span shroud wear-resistant coating repairing method

A technology of wear-resistant coating and repair method, applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problem of blade repair process and repair method not involved, difficulty in removing residual coating, thin-walled parts Deformation control and other issues to achieve the effect of improving fretting fatigue performance, eliminating the risk of blade torsional deformation, and improving repair efficiency

Active Publication Date: 2021-02-26
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the repair of wear-resistant coatings on blade shoulders is different from that of new parts, and many problems need to be solved: (1) The hardness of the coating is high, and it is difficult to remove the residual coating before repair; (2) The deformation of thin-walled parts is controlled during the spraying process; (3) It is difficult to process after spraying
[0005] For example, although the paper "Structure Design of Aeroengine Fan Blade Shoulder (Aero Engine, 2004, 30, 14-17)" introduced the coating material system for the compressor working blade shoulder, the repair process and repair method of the blade are not not involved

Method used

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  • Titanium alloy blade mid-span shroud wear-resistant coating repairing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Use AC850 passivation glue to protect the non-coated surface of the compressor blade;

[0041] (2) First, the original wear-resistant coating is removed by an electrochemical method, and the concentration of sodium carbonate in the electrochemical solution used is 1.5 mol / L, and the concentration of sodium hydroxide is 0.5 mol / L. Immerse the protected blade shoulder in the electrochemical solution, the temperature of the solution is 60°C, the removal voltage is 6V, and the removal current density is 0.6A / cm 2 , remove after 2 hours and wash and dry.

[0042] (3) The remaining coating is removed by sand blasting, the sand particles are white corundum, the particle size is 150 μm, and the sand blasting pressure is 0.3 MPa.

[0043] (4) The double-layer structure wear-resistant coating is prepared by explosive spraying process. The bottom layer is made of NiCrAl powder with a particle size of 10-40 μm. The thickness of the prepared bottom layer is 75 μm, and the measure...

Embodiment 2

[0050] (1) Use AC850 passivation glue to protect the non-coated surface of the compressor blade;

[0051] (2) First, the original wear-resistant coating is removed by an electrochemical method, and the concentration of sodium carbonate in the electrochemical solution used is 2.0 mol / L, and the concentration of sodium hydroxide is 1.0 mol / L. Immerse the protected blade shoulder in the electrochemical solution, the temperature of the solution is 60°C, the removal voltage is 5.0V, and the removal current density is 1.0A / cm 2 , remove after 2 hours and wash and dry.

[0052] (3) The remaining coating is removed by sand blasting, the sand particles are white corundum, the particle size is 150 μm, and the sand blasting pressure is 0.3 MPa.

[0053] (4) The double-layer structure wear-resistant coating is prepared by explosive spraying process. The bottom layer is made of NiAl powder with a particle size of 10-40 μm. The thickness of the prepared bottom layer is 50 μm, and the measu...

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Abstract

The invention belongs to the field of aero-engine protective coatings, and particularly relates to a titanium alloy blade mid-span shroud wear-resistant coating repairing method. According to the method, a damaged coating on the surface of a mid-span shroud of a blade is removed by adopting a method of combining an electrochemical method and a sand blasting method, the wear-resistant coating withthe hardness gradient structure is prepared on the surface of the mid-span shroud by utilizing an explosion spraying method or a hypersonic flame spraying method, a bottom layer is formed by mixing Ni-based metal and Al2O3, and the hardness meets 380 HV-500 HV; and a surface layer is a WC-25Co wear-resistant coating. High-precision repair of the wear-resistant coating of the mid-span shroud is realized by symmetrically clamping and alternately repairing a concave airfoil surface mid-span shroud and a convex airfoil surface mid-span shroud. The method is used for repairing the wear-resistant coating of the mid-span shroud of the compressor blade, and has the advantages of small damage of a single repairing matrix, high dimensional precision, low repairing cost, high reliability and the like.

Description

technical field [0001] The invention belongs to the field of aero-engine protective coatings, in particular to a method for repairing a titanium alloy compressor blade shoulder wear-resistant coating. Background technique [0002] When an aero-engine is working, the compressor blades are required to bear huge centrifugal loads, aerodynamic loads, thermal loads and vibration loads. In addition, the number of blades is high and the probability of failure is high, among which vibration failures are the most prominent. In order to solve the vibration problem, the compressor blades are usually damped by Coulomb friction damping. For fan blades with large aspect ratio, blade body shoulders are usually used for vibration reduction. In order to protect the titanium alloy blade and prevent the shoulder contact surface from being worn due to blade vibration, a special hard alloy coating is usually sprayed on the shoulder contact surface, and a low friction coefficient dry film lubric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/126C23C4/06C23C4/10C23C4/02C25F5/00B24C1/00
CPCC23C4/126C23C4/06C23C4/10C23C4/02C25F5/00B24C1/006
Inventor 崔永静王长亮张昂宇波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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