Preparation method of fretting wear resistant alloy coating

An anti-fretting wear and alloy coating technology, applied in metal material coating process, coating, fusion spraying and other directions, can solve the problem of difficult to obtain satisfactory anti-fretting wear alloy coating quality and deteriorate the interlayer of the coating. The bonding strength with the matrix, the fusion and adhesion of the molten droplets are not ideal, and the effect of convenient and fast loading and unloading of workpieces, ensuring the quality of sandblasting and spraying, and convenient clamping

Inactive Publication Date: 2020-08-25
机械科学研究院浙江分院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper-nickel-indium alloy has special physical and chemical characteristics: (1) The main component copper conducts heat and dissipates heat quickly, and is easy to overheat and burn; (2) Copper is extremely easy to oxidize and vaporize, and will produce a large amount of dark brown in the process of plasma arc heating. Copper oxide mist either covers the surface of the coating or is entrapped between the coating droplet interface, resulting in the unsatisfactory fusion and adhesion of the droplet, which will seriously deteriorate the bonding strength between the coating layers and the substrate, too much The presence of polyoxide particles will also seriously damage the physical and chemical properties of the coating
The above characteristics lead to completely different process characteristics of copper-nickel-indium alloy and other alloy materials in the process of plasma arc spraying, poor compatibility, and it is difficult to obtain satisfactory anti-fretting wear alloy coating quality

Method used

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  • Preparation method of fretting wear resistant alloy coating
  • Preparation method of fretting wear resistant alloy coating
  • Preparation method of fretting wear resistant alloy coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing an anti-fretting wear alloy coating, comprising the following steps:

[0042] (1) Ultrasonic degreasing and sandblasting roughening of the workpiece to be sprayed;

[0043] (2) Place the workpiece to be sprayed after step (1) in the protective gear, which includes the box body and the protective cover ( figure 2 ), with a convenient and stable workpiece clamping mechanism inside, and then in an inert gas protection atmosphere (Ar 3000L / min, H 2 300L / min), the anti-fretting wear alloy coating is sprayed by plasma arc powder spraying process, and the anti-fretting wear alloy coating is composed of the following components in mass percentage: Ni 36%, In 5%, Cu balance: The spraying angle is 90°; the arc voltage is 62V; the power is 31kW; the spraying distance is 64mm; ; Both sides of the spray gun nozzle 1 are provided with two extended cooling protective gas spray pipes 5 and one near the surface of the workpiece such as image 3 The air knife ...

Embodiment 2

[0050] A method for preparing an anti-fretting wear alloy coating, comprising the following steps:

[0051] (1) Ultrasonic degreasing and sandblasting roughening of the workpiece to be sprayed;

[0052] (2) Place the workpiece to be sprayed after step (1) in the protective gear, which includes the box body and the protective cover ( figure 2 ), the box body is equipped with a convenient and stable workpiece clamping mechanism. Manually turn the screw to compress the blade, and then close the cover to protect the top and side of the blade from being sprayed, and then spraying can be carried out. Then in an inert gas protection atmosphere (Ar 3000L / min, H 2 320L / min) for reference figure 1 , the anti-fretting wear alloy coating is sprayed by plasma arc powder spraying process, and the anti-fretting wear alloy coating is composed of the following components in mass percentage: Ni 32%, In 3%, Cu balance: spraying angle 90° ;Arc voltage 60V; Power 30kW; Spraying distance 62mm...

Embodiment 3

[0055] A method for preparing an anti-fretting wear alloy coating, comprising the following steps:

[0056] (1) Ultrasonic degreasing and sandblasting roughening of the workpiece to be sprayed;

[0057] (2) Place the workpiece to be sprayed after step (1) in the protective gear, which includes the box body and the protective cover ( figure 2 ), the box body is equipped with a convenient and stable workpiece clamping mechanism, and then in an inert gas protection atmosphere (Ar 3000L / min, H 2 310L / min) for reference figure 1 , the anti-fretting wear alloy coating is sprayed by plasma arc powder spraying process, and the anti-fretting wear alloy coating is composed of the following components in mass percentage: Ni 35%, In 4%, Cu balance: spraying angle 90° ; Arc voltage 60~62V; Power 30kW; Spraying distance 63mm; Air knife type degassing device on the side of the workpiece surface ( image 3 ). The specific structure is a device with the function of ejection and suction....

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Abstract

The invention relates to the technical field of thermal spraying materials and coatings, in particular to a preparation method of a fretting wear resistant alloy coating. The preparation method comprises the following steps of: (1) pretreating a workpiece to be sprayed; and (2) spraying the fretting wear resistant alloy coating on the pretreated workpiece by adopting a plasma arc powder spraying process. The spraying angle is 90 degrees, the arc voltage is 60-62V, the power is 30-31 kW, the spraying distance is 62-64 mm, the powder feeding amount is controlled to be 35-45 g/min, and the spraying moving speed of a spray gun is controlled to be 600mm/s. According to the process method and parameters, the anti-oxidation and cooling fog discharging method, the rapid and reliable protective shielding tool and the accurate spray gun motion control of the robot, the obtained coating has an ideal coating structure, extremely low oxide inclusion, coating bonding strength greatly higher than theindex requirement, porosity and coating hardness meeting the requirements, and coating thickness and precision meeting the requirements and controllable.

Description

technical field [0001] The invention relates to the technical field of thermal spraying materials and coatings, in particular to a preparation method of an anti-fretting wear alloy coating. Background technique [0002] Aircraft engines, ground gas turbines and other fans, compressor blades, turbine blades and other blades have very complicated working conditions, and must bear the joint action of mechanical, thermal and aerodynamic loads. There is a huge potential safety hazard in the process, and it is prone to damage accidents of the compressor impeller. Therefore, it is necessary to coat the anti-fretting wear alloy coating on the blade root surface of the blade after finishing the workpiece, which requires that the coating process of the anti-fretting wear alloy coating cannot be applied to the surface of other parts after finishing. Cause damage such as splashing, pinching or knocking. [0003] The surface coating of the blade root of the existing blade is mostly mad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/129C23C4/02C23C4/08C22C9/06
CPCC22C9/06C23C4/02C23C4/08C23C4/129C23C4/134
Inventor 于浩李飞计亚平许岚王林
Owner 机械科学研究院浙江分院有限公司
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