A method for repairing wear-resistant coatings on titanium alloy blade shoulders

A technology of wear-resistant coating and repair method, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., and can solve the problem that the blade repair process and repair method are not involved, the residual coating is difficult to remove, and 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: 2022-05-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
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  • 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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  • A method for repairing wear-resistant coatings on titanium alloy blade shoulders

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Experimental program
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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, in particular to a method for repairing wear-resistant coatings on shoulders of titanium alloy blades. The invention adopts the combined method of electrochemical method and sandblasting method to remove the damaged coating on the surface of the blade shoulder, and utilizes the method of explosive spraying or supersonic flame spraying to prepare a hardness gradient structure wear-resistant coating on the surface of the shoulder, wherein the bottom layer is made of Ni base metal and Al 2 o 3 Mixed composition, the hardness meets 380~500HV; the surface layer is WC‑25Co wear-resistant coating. The high-precision repair of the wear-resistant coating on the shoulders is realized by symmetrical clamping and alternate repairing of the blade pot shoulders and blade back shoulders. The method repairs the wear-resistant coating on the shoulder of the compressor blade, and has the advantages of small damage to the substrate in a single repair, high dimensional accuracy, low repair cost and high reliability.

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 Patents(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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