Preparation method of aluminum alloy surface composite coating layer

A technology of aluminum alloy surface and composite coating, which is applied in the field of laser processing, can solve the problems of nanostructure NiCrAl/TiC composite coating, low efficiency, complicated process, etc. The effect of high light absorption rate

Inactive Publication Date: 2014-08-27
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not suitable for laser cladding Al 2 o 3 / TiO 2 Before the coating experiment, it is necessary to thermally spray Ni-coated Al primer on the surface of the ZL104 aluminum alloy substrate, which makes the process complicated and low in efficiency.
[0007] After retrieving published journals and patents at home and abroad, no method has been found to prepare nanostructured NiCrAl / TiC composite coatings by laser cladding on the surface of aluminum-silicon alloys.

Method used

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  • Preparation method of aluminum alloy surface composite coating layer
  • Preparation method of aluminum alloy surface composite coating layer
  • Preparation method of aluminum alloy surface composite coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Cut the aluminum alloy plate into a laser cladding sample, and perform shot blasting on the cladding surface of the aluminum alloy plate sample;

[0034] (2) Use acetone and alcohol to remove oxides, impurities and oil stains on the surface of cladding samples;

[0035] (3) Dry the NiCrAl powder at 70°C for 8 hours to obtain the pretreated NiCrAl powder, wherein the NiCrAl powder is mixed with 60 nm Ni, Cr and Al powder, and the mass percentage of Cr in the NiCrAl powder is 16%, The mass percentage of Al is 6%, and the mass percentage of Ni powder is 78%;

[0036] (4) Using cross-flow multimode CO 2 The laser cladding NiCrAl powder on the aluminum alloy plate sample to obtain a composite coating, in which the laser power is 3.8 kW, the scanning speed is 420 mm / min, the NiCrAl powder feeding rate is 0.5 g / s, the protective gas flow rate is 8 L / h, and the defocus The measurement is 40 mm, the spot diameter is 5 mm, the thickness of the composite coating is 1.0 mm, a...

Embodiment 2

[0041] (1) Cut the aluminum alloy plate into a laser cladding sample, and perform shot blasting on the cladding surface of the aluminum alloy plate sample;

[0042] (2) Use acetone and alcohol to remove oxides, impurities and oil stains on the surface of cladding samples;

[0043] (3) Dry NiCrAl powder and TiC powder at 85°C for 7 hours to obtain pretreated NiCrAl powder and TiC powder, wherein the powder particle size of NiCrAl powder and TiC are both 80nm, and NiCrAl powder is made of 80nm Ni, Cr, Al The powder is mixed, and the mass percent of Cr is 17% in NiCrAl powder, and the mass percent of Al is 7%, and the mass percent of Ni powder is 76%;

[0044] (4) Using cross-flow multimode CO 2 The composite coating was obtained by cladding NiCrAl powder and TiC powder on the aluminum alloy plate sample with a laser. The laser power was 4.0 kW, the scanning speed was 400 mm / min, the NiCrAl powder feeding rate was 0.55 g / s, and the TiC powder feeding rate was 0.1 g / s (the TiC c...

Embodiment 3

[0049] (1) Cut the aluminum alloy plate into a laser cladding sample, and perform shot blasting on the cladding surface of the aluminum alloy plate sample;

[0050] (2) Use acetone and alcohol to remove oxides, impurities and oil stains on the surface of cladding samples;

[0051] (3) Dry NiCrAl powder and TiC powder at 100°C for 6 hours to obtain pretreated NiCrAl powder and TiC powder, wherein the powder particle size of NiCrAl powder and TiC are both 100 nm, and NiCrAl powder is made of 100 nm Ni, Cr , Al powder mixed, the mass percentage of Cr in the NiCrAl powder is 18%, the mass percentage of Al is 8%, and the mass percentage of Ni is 74%;

[0052] (4) Using cross-flow multimode CO 2 The composite coating was obtained by cladding NiCrAl powder and TiC powder on the aluminum alloy plate sample with a laser. The laser power was 4.2 kW, the scanning speed was 380 mm / min, the NiCrAl powder feeding rate was 0.6 g / s, and the TiC powder feeding rate was 0.26 g / s (the TiC cont...

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Abstract

The invention discloses a preparation method of an aluminum alloy surface composite coating layer, and belongs to the laser processing technical field. An NiCrAl/TiC nano coating layer is prepared on the surface of an aluminum alloy through melting covering by using a CO2 high-power laser device; a nano powder has small particle size and large specific surface area, and surface atoms are in an unstable state, so that a melting point is relatively low, the absorption rate on CO2 laser is relatively large, the laser energy density required in the melting covering process is also relatively small, and thus the dilution rate of the coating layer on a substrate can be guaranteed to be relatively small. The interior of the melting-covered layer prepared by the method is free of cracks, pores and other defects; and the prepared laser melting-covered coating layer is suitable for the remanufacturing technical fields such as surface modification and repairing of aluminum alloy engines and other structural parts, can greatly improve the usability of the aluminum alloy structural parts, prolongs the service life, and achieves great economic benefits.

Description

technical field [0001] The invention relates to a method for preparing a composite coating on an aluminum alloy surface, and belongs to the technical field of laser processing. Background technique [0002] Aluminum alloys have been widely used in ships, vehicles, aerospace and other fields due to their advantages such as low density, high specific strength, good corrosion resistance and formability, and low cost. Especially in recent decades, the world's energy crisis and environmental pollution have become the biggest challenges for the automotive industry. The intensity of energy conservation and emission reduction of automobiles has increased, and the lightweight process has accelerated, which has led to an increasing proportion of automotive aluminum alloy structural parts. However, aluminum alloys have the disadvantages of low surface hardness, high friction coefficient, large wear, easy to be scratched and difficult to lubricate, low strength and prone to plastic defo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/05C22C32/00
Inventor 刘洪喜李琦张晓伟蒋业华姚爽张旭
Owner KUNMING UNIV OF SCI & TECH
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