Method for repairing NiCrAlYSi coating on DZ125 blade surface

A DZ125, repair method technology, applied in coating, metal material coating process, ion implantation plating and other directions, can solve the problems of over-corrosion of blade substrate, scrapped blade, coating peeling, etc., to achieve stable performance and state, production The effect of low cost and broad application prospects

Active Publication Date: 2013-03-13
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The material is the engine blade of DZ125 alloy. In order to effectively improve the resistance to high-temperature corrosion and high-temperature gas flow erosion, the vacuum arc method is used to plate the NiCrAlYSi coating on the surface of the blade as a protective layer. After a service life cycle, the coating will fall off and Incomplete phenomenon, unable to meet the design requirements, resulting in blade scrapping, the scrapping rate is more than 30%, which requires coating removal, recoating and heat treatment to repair the NiCrAlYSi coating on the surface of the DZ125 blade
However, because the DZ125 alloy material itself has high anti-oxidation and anti-corrosion properties, and the coating obtained by the vacuum ion plating process is uniform and compact after diffusion heat treatment, and has high bonding strength, which can protect the base material well. Difficult to remove the coating completely
In the prior art, the use of mechanical processing to remove the coating is likely to cause the size of the parts to be out of tolerance, and the use of chemical methods to remove the coating can easily cause over-corrosion of the blade substrate, and also prone to adverse phenomena such as fluorescent display

Method used

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  • Method for repairing NiCrAlYSi coating on DZ125 blade surface
  • Method for repairing NiCrAlYSi coating on DZ125 blade surface
  • Method for repairing NiCrAlYSi coating on DZ125 blade surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Remove the original coating: heat the coating removal bath to 38°C, place the DZ125 blade coated with NiCrAlYSi coating to be treated in the coating removal bath, stir the bath at the same time, and treat for 25 minutes;

[0022] Take out the treated blade, and use a wool felt wheel with 180 mesh emery to smooth the blade until there is no visible coating residue on the surface of the blade;

[0023] (2) Vacuum arc plating coating: adopt vacuum arc plating device, set working pressure -2 Pa, the working current is 600A, the working voltage is 250V, and the blade surface is ion-cleaned for 6 minutes, then the working current is set to 700A, the working voltage is 30V, and the NiCrAlYSi coating is coated on the blade surface for 130 minutes, and then the blade is cooled for 2 hours;

[0024] (3) Vacuum heat treatment: place the cooled blade in a vacuum heat treatment furnace, and keep it warm at 860°C for 20h.

[0025] The industrial requirements for the durability o...

Embodiment 2

[0036] (1) Remove the original coating: heat the coating removal bath to 40°C, place the DZ125 blade coated with NiCrAlYSi coating to be treated in the coating removal bath, stir the bath at the same time, and treat for 8 minutes;

[0037] Take out the treated blade, and use a wool felt wheel with 180 mesh emery to smooth the blade until there is no visible coating residue on the surface of the blade;

[0038] (2) Vacuum arc plating coating: adopt vacuum arc plating device, set working pressure -2 Pa, the working current is 700A, the working voltage is 250V, and the blade surface is ion cleaned for 2 minutes, then the working current is set to 750A, the working voltage is 34V, and the NiCrAlYSi coating is coated on the blade surface for 110 minutes, and then the blade is cooled for 2.5 hours;

[0039] (3) Vacuum heat treatment: place the cooled blade in a vacuum heat treatment furnace, and keep it warm at 880°C for 20h.

Embodiment 3

[0041] (1) Remove the original coating: heat the coating removal bath to 39°C, place the DZ125 blade coated with NiCrAlYSi coating in the coating removal bath, stir the bath at the same time, treat for 10 minutes, take out For the leaves, use a brush to remove the residue on the leaf body in flowing warm water, observe the coating removal situation, place the side of the leaf body with more remaining coating facing down in the bath, and continue the treatment for 5 minutes;

[0042] Take out the treated blade, and use a wool felt wheel with 180 mesh emery to smooth the blade until there is no visible coating residue on the surface of the blade;

[0043] (2) Vacuum arc plating coating: adopt vacuum arc plating device, set working pressure -2 Pa, the working current is 650A, the working voltage is 250V, and the blade surface is ion cleaned for 4 minutes, then the working current is set to 720A, the working voltage is 32V, the NiCrAlYSi coating is coated on the blade surface for ...

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Abstract

The invention belongs to the field of surface treatment, and particularly a method for repairing an NiCrAlYSi coating on a DZ125 blade surface. The method comprises the following steps: removing the original NiCrAlYSi coating on the blade in a coating removal tank solution, treating the blade with a wool felt wheel bonded with 180-mesh corundum until no megascopic coating residue is left on the blade surface, plating a new NiCrAlYSi coating with a vacuum arc plating device for 110-130 minutes, and finally, carrying out heat treatment on the blade in a vacuum heat treatment furnace. The blade subjected to coating repair has the advantages of good use effect and stable property and state; surface over etching, fluoroscopy, mechanical properties and other performance indexes can achieve the design requirements; and the blade repaired through the coating by utilizing the method provided by the invention has the advantages of low production cost, operation convenience and wide application prospects.

Description

technical field [0001] The invention belongs to the field of surface treatment, in particular to a method for repairing a NiCrAlYSi coating on the surface of a DZ125 blade. Background technique [0002] After the engine has been used for a life cycle, it needs to be repaired according to the design requirements. For parts that do not meet the design standards, they need to be repaired to meet the design standards before they can be put into use again, otherwise they will be scrapped. Therefore, improving the service life of parts, reducing costs, and maintenance processes are very critical. [0003] The material is the engine blade of DZ125 alloy. In order to effectively improve the resistance to high-temperature corrosion and high-temperature gas flow erosion, the vacuum arc method is used to plate the NiCrAlYSi coating on the surface of the blade as a protective layer. After a service life cycle, the coating will fall off and The incomplete phenomenon cannot meet the desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/32C23C14/02C23C14/58
Inventor 王辉张春刚刘礼祥龚颖勇李庆春
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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