Preparation method of laser irradiation in-situ self-generated Al-Fe-Si ternary ceramic/Fe composite coating

A technology of al-fe-si and ternary ceramics, which is applied in coating, metal material coating process, etc., can solve the problem of poor wettability between reinforcement and coating substrate, poor bonding between coating and substrate, and poor interface bonding, etc. problems, to achieve good application prospects and economic significance, clean interface, and not easy to peel off

Inactive Publication Date: 2012-09-12
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, people's research on composite coatings has been focusing on traditional thermal spraying and surfacing methods, etc. The coatings prepared by such methods have poor bonding with the substrate, poor coating quality, and short coating life.
Moreover, the wettability between the reinforcement and the coating substrate in the coating prepared by the method of adding reinforcement is poor, and the interface is poorly bonded.

Method used

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  • Preparation method of laser irradiation in-situ self-generated Al-Fe-Si ternary ceramic/Fe composite coating
  • Preparation method of laser irradiation in-situ self-generated Al-Fe-Si ternary ceramic/Fe composite coating
  • Preparation method of laser irradiation in-situ self-generated Al-Fe-Si ternary ceramic/Fe composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, use a sandblasting machine to sandblast the surface of the substrate Q235 steel to remove the rust layer and oxides on the surface, and obtain a surface with a large surface roughness; clean the surface of the roughened Q235 steel with acetone solution until the surface Clean without oil stains, etc.; then air dry naturally for later use. Put 200-mesh Fe powder, 200-mesh Al powder and 200-mesh Si powder into the mixer at a ratio of 6:1:3 and mix for 3 hours, so that Fe powder, Al powder and Si powder are fully mixed and prepared into Fe-Al- Si composite powder. Put the Q235 steel on the laser workbench, set the prefabricated composite powder on the substrate, and scan with the laser. The process parameters of the laser are: the laser power is 1600W, the scanning speed is 400mm / min, and the spot diameter is 4mm.

Embodiment 2

[0019] First, use a sandblasting machine to sandblast the surface of the substrate Q235 steel to remove the rust layer and oxides on the surface, and obtain a surface with a large surface roughness; clean the surface of the roughened Q235 steel with acetone solution until the surface Clean without oil stains, etc.; then air dry naturally for later use. Put 200-mesh Fe powder, 200-mesh Al powder and 200-mesh Si powder into the mixer at a ratio of 8:1:1 and mix for 3 hours, so that Fe powder, Al powder and Si powder are fully mixed and prepared into Fe-Al- Si composite powder. Put the Q235 steel on the laser workbench, set the prefabricated composite powder on the substrate, and scan with the laser. The process parameters of the laser are: the laser power is 1600W, the scanning speed is 400mm / min, and the spot diameter is 4mm.

Embodiment 3

[0021] First, use a sandblasting machine to sandblast the surface of the substrate Q235 steel to remove the rust layer and oxides on the surface, and obtain a surface with a large surface roughness; clean the surface of the roughened Q235 steel with acetone solution until the surface Clean without oil stains, etc.; then air dry naturally for later use. Put 200-mesh Fe powder, 200-mesh Al powder and 200-mesh Si powder into the mixer at a ratio of 7:1:2 and mix for 3 hours, so that Fe powder, Al powder and Si powder are fully mixed and prepared into Fe-Al- Si composite powder. Put the Q235 steel on the laser workbench, set the prefabricated composite powder on the substrate, and scan with the laser. The process parameters of the laser are: the laser power is 1600W, the scanning speed is 400mm / min, and the spot diameter is 4mm.

[0022] figure 1 For the microstructure of the composite coating prepared in Example 1, it can be seen from the figure that the coating surface is smoo...

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Abstract

The invention relates to a preparation method of a laser irradiation in-situ self-generated Al-Fe-Si ternary ceramic / Fe composite coating, which comprises the following steps: under the protection of argon and helium, irradiating Al, Si and Fe composite powder and a Q235 substrate with a laser beam to form the Al-Fe-Si ternary ceramic / Fe composite coating. The Fe-Al-Si ratio in the composite powder is 6:1:3-18:1:3, the laser spot diameter is 0.5-4mm, the power is 1000-2500W, and the scanning velocity is 200-600mm / minute.. The coating prepared by the method has the advantages of high metallurgical bonding firmness with the substrate, low stripping tendency, smooth surface, and no cracking or bubble defects in the coating.

Description

technical field [0001] The invention relates to a method for preparing a composite coating, in particular to a method for preparing a laser irradiation in-situ self-generated Al-Fe-Si ternary ceramic / Fe composite coating. Background technique [0002] Composite coating is a coating with new properties deposited on the surface of the substrate by two or more materials with different properties through physical or chemical methods. Since the various materials that make up the composite coating complement and coordinate with each other in performance, the overall performance of the composite coating is better than that of the original constituent materials, which can meet the requirements of various working conditions. Therefore, composite coatings have broad application prospects in the surface repair and strengthening of key parts in aerospace, machinery manufacturing, metallurgy and automobile industries. [0003] According to the addition method of the reinforcement of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 赵龙志张坚李德英吴文妮赵明娟
Owner EAST CHINA JIAOTONG UNIVERSITY
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