Method for improving bonding strength of plasma-sprayed Ni60A coating layer on surface of 6061 aluminum alloy

A technology of aluminum alloy surface and bonding strength, which is applied in the direction of metal material coating process, coating, fusion spraying, etc. Complicated preparation procedures and processes, unable to meet the requirements of the workpiece, etc., to achieve the effect of improved bonding strength and adhesion, improved coating bonding strength and microhardness, and fewer pores and cracks

Inactive Publication Date: 2017-12-12
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this treatment can obtain a better bonding strength between the coating-substrate interface, under the action of high-energy laser beams and plasma flames, there will often be more network cracks inside the remelted coating. The existence of cracks often makes the coating crack and peel off
At the same time, the preparation procedure and process of this kind of coating are complicated and the energy waste is serious.
Patent CN103103469 "A kind of aluminum alloy matrix composite material, preparation method and application" adopts plasma spraying to prepare copper coating on the surface of aluminum alloy, and introduces Ni / Al bonding layer prepared by nickel-clad aluminum composite powder, which improves the aluminum alloy and aluminum alloy. The bonding strength of the coating is about 20.3MPa as measured by the tensile test, but the Ni / Al bonding layer does not significantly increase the bonding strength between the coating and the substrate. A large number of documents and experiments show that: plasma spraying on the surface of aluminum alloy The bonding strength of the Ni / Al bonding layer is only between 10 and 20Mpa
In most cases, the bonding force of this size cannot meet the requirements of the workpiece.

Method used

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  • Method for improving bonding strength of plasma-sprayed Ni60A coating layer on surface of 6061 aluminum alloy
  • Method for improving bonding strength of plasma-sprayed Ni60A coating layer on surface of 6061 aluminum alloy
  • Method for improving bonding strength of plasma-sprayed Ni60A coating layer on surface of 6061 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation process of plasma sprayed Ni60A coating is divided into four stages: substrate surface pretreatment-plasma sprayed NiCrAlY bonding layer-plasma sprayed Ni60A working layer-coating vacuum heat treatment, the bonding layer is made of NiCrAlY composite powder, The thickness of the bonding layer is 100 μm, the working layer is a nickel-based alloy layer made of Ni60A composite powder, the thickness of the working layer is 300 μm, the heat treatment temperature is 150° C., and the holding time is 6 hours. Specific steps are as follows:

[0026] (1) Substrate surface pretreatment

[0027] Use sandpaper to grind the surface of the 6061 aluminum alloy substrate to remove the oxide film on the surface of the substrate until the surface roughness of the aluminum alloy after grinding is Ra<0.8, then rinse the surface of the substrate with alcohol to remove oil and other impurities. Finally, sand blasting equipment is used to roughen the surface of the substrate. ...

Embodiment 2

[0044] The preparation process of plasma sprayed Ni60A coating is divided into four stages: substrate surface pretreatment-plasma sprayed NiCrAlY bonding layer-plasma sprayed Ni60A working layer-coating vacuum heat treatment, the bonding layer is made of NiCrAlY composite powder, The thickness of the bonding layer is 100 μm, the working layer is a nickel-based alloy layer made of Ni60A composite powder, the thickness of the working layer is 300 μm, the heat treatment temperature is 200° C., and the holding time is 6 hours. Specific steps are as follows:

[0045] (1) Substrate surface pretreatment

[0046] Use sandpaper to grind the surface of the 6061 aluminum alloy substrate to remove the oxide film on the surface of the substrate until the surface roughness of the aluminum alloy after grinding is Ra<0.8, then rinse the surface of the substrate with alcohol to remove oil and other impurities. Finally, sand blasting equipment is used to roughen the surface of the substrate. ...

Embodiment 3

[0054] In this example, the bonding strength of the coatings prepared in Example 1 and Example 2 was tested by the bonding tensile method, and the tensile method was tested according to the standard of GB / T8642-2002 "Determination of Tensile Bonding Strength of Thermal Spray Coating". Adopt the acoustic emission detection method to test the adhesion of the NiCrAlY bonding layer prepared by embodiment 1 and embodiment 2 and the substrate, the acoustic emission method adopts the acoustic emission detection of the WS-2005 coating adhesion automatic scratch instrument, and the loading load is 200g , loading time 90s. The microhardness of the coatings prepared in Example 1 and Example 2 was tested with a microhardness tester, with a load of 100 g and a loading time of 15 s. The porosity of the coatings in Example 1 and Example 2 was calculated using a metallographic microscope and Image J2x porosity calculation software, and the test results are shown in Table 3.

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Abstract

The invention relates to a method for improving the bonding strength of a plasma-sprayed Ni60A coating layer on the surface of a 6061 aluminum alloy. The method comprises the steps of sequentially spraying NiCrAlY and Ni60A composite powder to the surface of a matrix, namely the 6061 aluminum alloy by virtue of a plasma spraying technique so as to prepare a NiCrAlY bonding layer and a Ni60A working layer, putting the prepared product into a vacuum furnace, and carrying out thermal treatment. The prepared Ni60A coating layer is high in strength and good in wear resistance, the bonding strength of the coating layer is more than or equal to 30Mpa, the microhardness can reach 1100HV0.1 or above, the wear resistance of the 6061 aluminum alloy matrix is improved, and the service life of the coating layer is effectively prolonged.

Description

technical field [0001] The invention relates to the field of surface modification of an aluminum alloy substrate, in particular to a method for improving the bonding strength of a plasma sprayed Ni60A coating on the surface of a 6061 aluminum alloy. Background technique [0002] Aluminum alloy has excellent physical and chemical properties such as light weight, easy processing, and high specific strength, so it is widely used in machinery, automobiles, aerospace and other fields. It is an ideal material for lightweight and energy saving. It is also the second largest type of metal material used in industry after steel. However, aluminum alloy materials have low hardness and poor wear resistance, which limit their further application in industry. Through the surface modification technology, the metal surface structure and properties can be changed, and the matrix can be endowed with new properties, which is of great significance for further expanding the use range of aluminu...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/073C23C4/06C23C4/18
CPCC23C4/134C23C4/06C23C4/073C23C4/18
Inventor 项大林张建新王晨星崔爱林
Owner HEBEI UNIV OF TECH
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