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Size correcting method for aeroengine high-temperature alloy disc shaft abrasion

A technology for aero-engines and high-temperature alloys, applied in metal material coating technology, fusion spraying, coatings, etc., can solve problems affecting the performance of coatings and parts, poor service performance of coatings, and easy peeling of coatings, etc. Achieve the effects of improving oxidation resistance and wear resistance, improving surface integrity and prolonging service life

Inactive Publication Date: 2020-04-17
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonding strength with the substrate is about 30MPa, some special coatings are also less than 50MPa, the bonding strength with the substrate is weak, and the coating is easier to peel off and fall off
Ultimately, the service performance of the coating is poor, which affects the performance of the coating and parts

Method used

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  • Size correcting method for aeroengine high-temperature alloy disc shaft abrasion
  • Size correcting method for aeroengine high-temperature alloy disc shaft abrasion
  • Size correcting method for aeroengine high-temperature alloy disc shaft abrasion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for repairing the size of aero-engine superalloy disc shaft wear, the specific implementation steps are as follows:

[0027] (1) Parts degreasing: Before spraying the coating, use acetone to wipe the area of ​​the parts that needs to be repaired to remove oil and debris;

[0028] (2) Protection before sand blowing: Use protective tape to protect the parts that do not need to be sprayed and repaired before sand blowing;

[0029] (3) Parts sand blowing: Sand blowing treatment is performed on the area of ​​the parts that needs to be repaired, and the surface of the parts is activated and roughened. Among them, the sand blowing medium is 80-mesh alumina sand, the sand blowing pressure is 0.2MPa, and the roughness is 2.0 μm;

[0030] (4) Supersonic spraying: supersonic spraying NiCrFeMo coating on the area after sand blowing, wherein the kerosene flow rate is 3.5 gallons / h, the oxygen flow rate is 1600L / min, the argon gas flow rate is 10L / min, and the powder feedin...

Embodiment 2

[0034] A method for repairing the size of aero-engine superalloy disc shaft wear, the specific implementation steps are as follows:

[0035] (1) Parts degreasing: Before spraying the coating, use acetone to wipe the area of ​​the parts that needs to be repaired to remove oil and debris;

[0036] (2) Protection before sand blowing: use glass fiber cloth to protect the parts that do not need spraying and repairing before sand blowing;

[0037] (3) Parts sand blowing: Sand blowing treatment is performed on the area where the parts need to be repaired, and the surface of the parts is activated and roughened. Among them, the sand blowing medium is 60-mesh alumina sand, the sand blowing pressure is 0.3MPa, and the roughness is 2.5 μm;

[0038] (4) Supersonic spraying: supersonic spraying NiCrFeMo coating on the area after sand blowing, wherein the kerosene flow rate is 7 gallons / h, the oxygen flow rate is 600L / min, the argon gas flow rate is 10L / min, and the powder feeding rate is ...

Embodiment 3

[0041] A method for repairing the size of aero-engine superalloy disc shaft wear, the specific implementation steps are as follows:

[0042] (1) Parts degreasing: Before spraying the coating, use gasoline to wipe the area of ​​the parts that needs to be repaired to remove oil and debris;

[0043] (2) Protection before sand blowing: Use tooling to protect the parts of the parts that do not need to be sprayed and repaired before sand blowing;

[0044] (3) Parts sand blowing: Sand blowing treatment is performed on the area of ​​the parts that needs to be repaired to activate and roughen the surface of the parts. Among them, the sand blowing medium is 70 mesh alumina sand, the sand blowing pressure is 0.2MPa, and the roughness is 2.3 μm;

[0045] (4) Supersonic spraying: supersonic spraying NiCrFeMo coating on the area after sand blowing, wherein the kerosene flow rate is 5 gallons / h, the oxygen flow rate is 1000L / min, the argon gas flow rate is 10L / min, and the powder feeding ra...

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Abstract

The invention discloses a size correcting method for aeroengine high-temperature alloy disc shaft abrasion, in particular to a thermal spraying size correcting coating technology for an aeroengine nickel-base alloy disc shaft part. The method comprises the specific steps that (1) before a coating is sprayed, the part is subjected to oil removing treatment; (2) the non-coating area of the part is protected; (3) the part is subjected to sand blowing treatment; (4) ultrasonic spraying of a NiCrFeMo coating is carried out on an area after sand blowing; and (5) the sprayed coating is subjected to machining, so that the surface roughness of the coating is consistent with the surface roughness of the part. The bonding strength of the size correcting coating prepared by the method and the base alloy is greater than 69 MPa, the porosity of the size correcting coating is less than 1%, the oxygen content is less than 0.5%, and the hardness is HV0.3435.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and relates to a thermal spraying dimensional repair coating technology for aero-engine nickel-based alloy disc shaft parts, in particular to a supersonic flame spraying nickel-based alloy dimensional repairing coating technology. Background technique [0002] When the engine is running, the contact position of the parts is out of tolerance due to wear and tear, resulting in the parts being scrapped. In order to meet the demand for the continued use of engine parts and reduce production costs, it is necessary to repair the size of the worn parts to ensure the assembly size of the parts. At present, almost all in-service aero-engines use GH4169 grade superalloy materials to manufacture high-speed rotating disc and shaft parts. urgent. However, due to the fast rotation speed (above 400m / s) of the disc shaft parts, the bonding strength, surface roughness, stress state, structure and other pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/08C23C4/02C23C4/18
CPCC23C4/02C23C4/08C23C4/18C23C4/129
Inventor 张佳平芦国强袁福河李小罡王奇峰
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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