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Method for preparing aluminum alloy surface composite gradient modified layer

A technology of aluminum alloy surface and modified layer, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of low equipment requirements, complex process, high cost, etc., and achieve high production efficiency and technology. Simple process and low cost effect

Inactive Publication Date: 2019-01-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can effectively prepare gradient modified layers with good performance, but there are also some disadvantages, such as complex process, long period and high cost.
In short, there is no method with simple process and low equipment requirements that can prepare a modified layer with composite gradient structure characteristics on the surface of aluminum alloy.

Method used

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  • Method for preparing aluminum alloy surface composite gradient modified layer
  • Method for preparing aluminum alloy surface composite gradient modified layer
  • Method for preparing aluminum alloy surface composite gradient modified layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Surface pretreatment of aluminum alloy materials: Cut the aluminum alloy into 30×30×5 mm in size by wire cutting, polish the surface of the sample with sandpaper, and then place it in distilled water and absolute ethanol for 6 minutes for ultrasonic cleaning and blow dry to obtain Aluminum alloy material after pretreatment.

[0030] (2) Mechanical nano-alloying of the aluminum alloy surface: put the polished aluminum alloy material into the ball mill tank attached to the SPEX-8000M high-energy ball mill, put steel balls with a diameter of 6 mm in the sample chamber, and set the vibration head frequency to 50 Hz. At the same time, 1g of iron powder was added and treated for 1 hour. Observation by transmission electron microscope showed that the grain size of the alloyed Fe layer on the surface was refined to nanometer scale and was equiaxed and randomly distributed. The grain size was about 8-20nm. The thickness of the iron layer on the surface of the material is abo...

Embodiment 2

[0033] (1) Surface pretreatment of aluminum alloy materials: Cut the aluminum alloy into 30×30×5 mm in size by wire cutting, polish the surface of the sample with sandpaper, and then place it in distilled water and absolute ethanol for 6 minutes for ultrasonic cleaning and blow dry to obtain Aluminum alloy material after pretreatment.

[0034](2) Mechanical nano-alloying of the aluminum alloy surface: put the polished aluminum alloy material into the ball mill tank attached to the SPEX-8000M high-energy ball mill, put steel balls with a diameter of 6 mm in the sample chamber, and set the vibration head frequency to 50 Hz. At the same time, 1g of iron powder was added and treated for 1 hour. Observation by transmission electron microscope showed that the grain size of the alloyed Fe layer on the surface was refined to nanometer scale and was equiaxed and randomly distributed. The grain size was about 8-20nm. The scanning electron microscope test shows that the thickness of the ...

Embodiment 3

[0037] (1) Surface pretreatment of aluminum alloy materials: Cut the aluminum alloy into 30×30×5 mm in size by wire cutting, polish the surface of the sample with sandpaper, and then place it in distilled water and absolute ethanol for 6 minutes for ultrasonic cleaning and blow dry to obtain Aluminum alloy material after pretreatment.

[0038] (2) Mechanical nano-alloying of the aluminum alloy surface: put the polished aluminum alloy material into the ball mill tank attached to the SPEX-8000M high-energy ball mill, put steel balls with a diameter of 8mm in the sample chamber, and set the vibration head frequency to 50Hz. At the same time, 2g of iron powder was added and treated for 1 hour. Observation by transmission electron microscope showed that the grain size of the alloyed Fe layer on the surface was refined to nanometer level and was equiaxed and randomly distributed. The grain size was about 8-20nm. The scanning electron microscope test shows that the thickness of the i...

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Abstract

The invention discloses a method for preparing an aluminum alloy surface composite gradient modified layer. The method comprises the following steps: (1) pretreating the surface of an aluminum alloy material, namely grinding the surface with abrasive paper, sequentially washing respectively in alcohol and acetone solution to remove surface stains; (2) introducing a ferroalloy layer having a certain thickness and a nano-structure to the aluminum alloy surface by adopting a surface mechanical nano-alloying method; and (3) performing nitriding treatment at a certain temperature on the sample which is subjected to surface alloying treatment. By adopting the method, a modified layer having a gradient composite structure and excellent abrasion resistance is prepared on the surface of the aluminum alloy matrix, and has excellent compatibility and binding force with the matrix. Furthermore, the method is simple in process and low in cost, and is suitable for large-scale surface treatment of flat aluminum alloy materials.

Description

technical field [0001] The invention belongs to the field of aluminum alloy surface treatment, in particular to a method for preparing a composite gradient modified layer on the surface of an aluminum alloy. Background technique [0002] Insufficient wear resistance of aluminum alloy surface is the main problem limiting its further application. For this reason, material workers often use methods such as ion nitriding, ion implantation, physical vapor deposition, micro-arc oxidation, and laser surface treatment to modify the surface. These methods can prepare ceramics (such as AlN, TiN, etc.) on the surface of materials. 、Al 2 o 3 etc.) modified layer, using the high hardness and high corrosion resistance of the ceramic modified layer can effectively improve the surface properties of aluminum alloy. However, the physical properties (thermal expansion coefficient) and mechanical properties (hardness, elastic modulus) of the ceramic modified layer are extremely mismatched wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/02C23C8/24C23C8/36
CPCC23C8/24C23C8/36C23C24/02
Inventor 孙建梅良玉李毅吴玉程
Owner HEFEI UNIV OF TECH
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