Method for preparing Al-Cr composite coating through laser cladding

A technology of laser cladding and composite coating, which is applied in coating, metal material coating process, etc., can solve the problems of laser cladding technology application difficulty, difficult laser rapid prototyping, large thermal expansion coefficient, etc., and reduce cracking sensitivity , Realize the automation of industrial production and increase the effect of absorption

Active Publication Date: 2020-09-04
CHENGDU AERONAUTIC POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is reported that in the study of laser deposition of Al-40% Si alloy, it is pointed out that aluminum alloy has high laser reflectivity, large thermal expansion coefficient, high thermal conductivity, easy deformation and cracking, and it is difficult to realize laser rapid prototyping.
[0004] Therefore, the use of laser cladding technology to strengthen the surface of aluminum alloy will cause the following two problems: 1. The rapid cooling and rapid heating process of laser cladding is easy to generate a large amount of residual stress, resulting in cracks; 2. Aluminum alloy is a high reflectivity material , the application of laser cladding technology is difficult

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  • Method for preparing Al-Cr composite coating through laser cladding
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  • Method for preparing Al-Cr composite coating through laser cladding

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Embodiment 1

[0047] A preferred embodiment of the present invention provides a method for preparing an Al-Cr composite coating by laser cladding, the specific steps are as follows:

[0048] Put Al powder with a purity ≥ 99.0% and a particle size of 58 μm and Cr powder with a purity ≥ 99.0% and a particle size of 45 μm in the proportion of 50% of the mass of the Cr powder to the mass of the Al powder, and mix for 2 hours , where the forward and reverse interval time is 1min, the rotation speed is 100rpm, wrapped with aluminum foil, and placed in a drying oven at 40°C for 30min. Use 400 and 800 mesh sandpaper to grind off the oxide layer on the surface of the 7075 aluminum alloy plate in turn, then clean it with ultrasonic waves for 5 minutes, and dry it with a hair dryer. The surface is then sandblasted to increase the absorption of the laser light. The method of laser cladding is used to clad Al-Cr composite coating on the surface of 7075 aluminum alloy plate. The laser power is 1.7kW, t...

Embodiment 2

[0050] A preferred embodiment of the present invention provides a method for preparing an Al-Cr composite coating by laser cladding, the specific steps are as follows:

[0051] Put the Al powder with a purity ≥ 99.0% and a particle size of 58 μm and the Cr powder with a purity ≥ 99.0% and a particle size of 45 μm in the proportion of 30% of the mass of the Cr powder to the mass of the Al powder, and mix them for 2 hours , where the forward and reverse interval time is 1min, the rotation speed is 100rpm, wrapped with aluminum foil, and placed in a drying oven at 40°C for 30min. Use 400 and 800 mesh sandpaper to grind off the oxide layer on the surface of the 7075 aluminum alloy plate in turn, then clean it with ultrasonic waves for 5 minutes, and dry it with a hair dryer. The surface is then sandblasted to increase the absorption of the laser light. The method of laser cladding is used to clad Al-Cr composite coating on the surface of 7075 aluminum alloy plate. The laser powe...

Embodiment 3

[0053] A preferred embodiment of the present invention provides a method for preparing an Al-Cr composite coating by laser cladding, the specific steps are as follows:

[0054] Put Al powder with a purity ≥ 99.0% and a particle size of 58 μm and Cr powder with a purity ≥ 99.0% and a particle size of 45 μm in the proportion of 40% of the mass of the Cr powder to the mass of the Al powder, and mix for 2 hours , where the forward and reverse interval time is 1min, the rotation speed is 100rpm, wrapped with aluminum foil, and placed in a drying oven at 40°C for 30min. Use 400 and 800 mesh sandpaper to grind off the oxide layer on the surface of the 7075 aluminum alloy plate in turn, then clean it with ultrasonic waves for 5 minutes, and dry it with a hair dryer. The surface is then sandblasted to increase the absorption of the laser light. The method of laser cladding is used to clad Al-Cr composite coating on the surface of 7075 aluminum alloy plate. The laser power is 1.7kW, t...

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Abstract

The invention discloses a method for preparing an Al-Cr composite coating through laser cladding, and belongs to the technical field of aluminum alloy surface treatment. The method comprises the following steps of uniformly mixing Al powder and Cr powder, and drying; grinding off an oxide layer on the surface of an aluminum alloy plate by using abrasive paper, cleaning by using ultrasonic waves, and blow-drying; then carrying out surface sand blasting treatment so as to increase the absorption of laser; cladding an Al-Cr composite coating on the surface of an aluminum alloy by adopting a lasercladding method and an argon shield coaxial powder feeding mode; and under the action of a laser beam with high energy density, Al and Cr react to generate an AlxCry intermetallic compound, and jointly forming the composite coating by the metal phase and the ceramic phase. The Al-Cr composite coating has the advantages of being good in combination with a base material, not prone to cracking, highin hardness, good in abrasion resistance and the like, and therefore the surface of the aluminum alloy is strengthened.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface treatment, in particular to a method for preparing an Al-Cr composite coating by laser cladding. Background technique [0002] The use of lightweight materials is an important guarantee for aircraft lightweight design. Aluminum alloy materials are favored by people because of their high specific strength and low cost. Aeronautical duralumin 7075 is known as the most excellent product among aluminum alloys. It has good plasticity after solution treatment and particularly good heat treatment strengthening effect. It is used to make aircraft parts, gears and shafts, etc., but its surface properties are low and cannot meet modern requirements. The higher requirements of the aviation industry. [0003] Laser cladding technology uses high-energy-density laser beams as heat sources to melt the cladding material and the surface of the substrate together, forming a metallurgically bonded c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 王秋林任敏
Owner CHENGDU AERONAUTIC POLYTECHNIC
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