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Method for removing NiCrAlY coating of aero-engine blade

A technology for aero-engines and blades, applied in coatings, chemical instruments and methods, cleaning methods and appliances, etc., can solve problems such as uneven coating thickness, out-of-tolerance, and difficulty in completely removing coatings, and achieve simple processing , the effect of convenient operation

Pending Publication Date: 2022-01-25
CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the blades of aero-engines are often protected by NiCrAlY coating. Since the NiCrAlY blade coating is a high-temperature and oxidation-resistant composite metal cladding coating, a certain amount of diffusion will occur between the coating and the substrate after use, and the surface of the coating will It is oxidized to become wear-resistant and corrosion-resistant oxides, and the blades of aero-engines have high dimensional accuracy, so it is difficult to remove the coating by polishing. At the same time, it is difficult to control the amount of coating removal by polishing, resulting in out-of-tolerance blade dimensions. It is not easy to solve whether the coating is completely removed or the thickness of the coating is locally uneven

Method used

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  • Method for removing NiCrAlY coating of aero-engine blade
  • Method for removing NiCrAlY coating of aero-engine blade
  • Method for removing NiCrAlY coating of aero-engine blade

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Embodiment Construction

[0026] The technical solution of the present invention is further described below, but the scope of protection is not limited to the description.

[0027] Such as figure 1 Shown, the method for removing NiCrAlY coating of aeroengine blade of the present invention comprises the following steps, and the structure of blade is as follows figure 2 As shown, the blade coating to be removed is as image 3 shown.

[0028] Step 1, descaling:

[0029] Use wet sandblasting to remove scale and oxide film black spots on the surface of the blade coating, and the tenons must be protected during the sandblasting process. Parameters: compressed air 0.15~0.2MPa, white corundum 120#, the ratio of white corundum to water is 1:5 or 1:6. Blow off the fouling and oxide film black spots on the blade body surface and trailing edge. After processing, carefully blow out the inner and outer surfaces of the parts with compressed air.

[0030] Step 2, apply protective paint:

[0031] Use perchloret...

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Abstract

The invention discloses a method for removing a NiCrAlY coating of an aero-engine blade, and the method comprises the processes of scale removal, protective paint coating, blade body protective paint stripping, acid pickling, protective paint removal, water sand blasting and heating inspection. According to the method for removing the NiCrAlY coating of the aero-engine blade in the invention, The coating can be removed under the condition that the blade part is not damaged by using the mode of combining multiple technologies, the course of processing is simple, the operation is convenient, meanwhile, the non-spraying surface is protected by coating the protective paint, the engine blade part is well protected in the coating removal process, and the method can be popularized and used in the removal process of multiple engine blade coatings.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aero-engine blades, and in particular relates to a method for removing NiCrAlY coatings of aero-engine blades. Background technique [0002] At present, the blades of aero-engines are often protected by NiCrAlY coating. Since the NiCrAlY blade coating is a high-temperature and oxidation-resistant composite metal cladding coating, a certain amount of diffusion will occur between the coating and the substrate after use, and the surface of the coating will It is oxidized to become wear-resistant and corrosion-resistant oxides, and the blades of aero-engines have high dimensional accuracy, so it is difficult to remove the coating by polishing. At the same time, it is difficult to control the amount of coating removal by polishing, resulting in out-of-tolerance blade dimensions. It is not easy to solve whether the coating is completely removed or the thickness of the coating is locally uneven. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10B05D7/16B08B7/00B24C1/08
CPCC23G1/10B05D7/16B08B7/0071B24C1/08
Inventor 惠畅张江峰李昌程鸿雁唐杰何绍川张岩杨斌
Owner CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD