Wear-resistant and antifriction composite coating for aluminum alloy component surfaces and preparation method thereof

A technology of aluminum alloy components and composite coating, applied in metal material coating process, coating and other directions, can solve the problems of thermal stress deformation of aluminum alloy substrates, coating peeling failure, low bonding strength, etc., to inhibit brittle fracture Wear, Microstructural Strengthening, Effects of Strengthening Microstresses

Inactive Publication Date: 2016-06-01
中国人民解放军理工大学野战工程学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reinforced layer obtained by these traditional methods is relatively thin (only a few hundred microns), and the reinforced layer and the substrate are mechanically bonded or diffusely bonded. The bonding strength is not high, and it is easy to crack and fall off. Meet the actual needs of aluminum alloy friction components under severe working conditions such as high load, high speed, and dry friction
In addition, these methods also have their own disadvantages. For example, the anodic oxidation method cannot form a continuous anodic oxide film on the aluminum substrate, and the oxide film is brittle and cannot effectively wear the substrate; It is highly toxic, seriously pollutes the environment and endangers human health, and the coating performance i

Method used

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  • Wear-resistant and antifriction composite coating for aluminum alloy component surfaces and preparation method thereof
  • Wear-resistant and antifriction composite coating for aluminum alloy component surfaces and preparation method thereof
  • Wear-resistant and antifriction composite coating for aluminum alloy component surfaces and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Example 1: Preparation of wear-resistant and anti-friction composite coating for aluminum alloy friction components

[0030] 1. Material preparation:

[0031] (1) Tungsten carbide powder: sintered agglomerated powder, particle size 25μm~40μm, commercially available, produced by Shanghai Dahao Spraying Material Co., Ltd.

[0032] (2) Titanium diboride powder: particle size 8 μm ~ 12 μm, commercially available, Shandong Pengcheng Ceramic Material Co., Ltd., purity 99%.

[0033] (3) Cerium oxide powder: particle size 8 μm ~ 15 μm, commercially available, produced by Jiangxi Jiarun Rare Earth Co., Ltd. CeO 2 The content is 99.5%, and the balance is oxides of impurities such as La, Pr, Nd, Sm, Fe, Si, and Ca.

[0034] (4) Nickel-coated molybdenum disulfide (Ni-MoS 2 ) powder: particle size 75μm~90μm. It is commercially available and produced by Jiangyou Hebao Nano Materials Co., Ltd. It is made of molybdenum disulfide powder with a particle size of 2 μm to 4 μm and nick...

Embodiment 2

[0045] Performance test of embodiment 2 wear-resistant and friction-reducing composite coating

[0046] With GCr15 steel ball as the pair of rubbing parts, the coating of the present invention (that is, the wear-resistant and anti-friction composite coating prepared in Example 1), 45 # Steel, 6061 high-strength aluminum alloy, and pure nickel-based alloy coating were used for friction and wear tests.

[0047] The test conditions are: room temperature (25°C), relative air humidity of RH60%, dry friction, sliding speed of 0.25m / s, followed by 3N, 6N, 9N, 12N (the corresponding contact stress is: 1361MPa, 1558MPa, 1715MPa , 1847MPa, 1963MPa) load test, friction time: 30min. The friction and wear test results are as follows Figure 2 ~ Figure 3 .

[0048] The change curve of the friction coefficient of the four with the load is as follows figure 2 Shown: the friction coefficient of the coating of the present invention is between 0.279~0.352, which is 56.5%~58.4% lower than th...

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Abstract

The invention relates to a wear-resistant and antifriction composite coating for aluminum alloy component surfaces. The coating is composed of, by weight, 13-15% of tungsten carbide powder, 18-20% of titanium diboride powder, 2.0-4.0% of cerium oxide powder, 3.0-5.0% of nickel-coated molybdenum disulfide powder and the balance nickel-base alloy powder, wherein the components are blended through adhesives and then are arranged on the aluminum alloy component surfaces in a laser cladding mode for forming the coating; in the nickel-coated molybdenum disulfide powder, the coating ratio of nickel is 71-73%; nickel-base alloy is composed of, by weight, 0.75-0.85% of C, 15-16% of Cr, 3.5-4.5% of Si, 3.0-4.0% of B, 14.5-15.5% of Fe and the balance Ni. The coating is high in wear resistance and low in friction coefficient and solves the friction and wear problems of aluminum alloy used for friction members of mechanical equipment at high loads or impact loads, the service life is prolonged, and the friction energy consumption is lowered.

Description

technical field [0001] The invention relates to a wear-resistant and anti-friction composite coating on the surface of an aluminum alloy component, which is used for improving the wear resistance of the surface of the aluminum alloy component and reducing the friction coefficient. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, excellent electrical and thermal conductivity, and good formability. As an important lightweight metal material, it has been widely used in aerospace, marine ships, petrochemicals, automobiles, weapons and In the field of military engineering equipment, especially in the military field, the use of aluminum alloy instead of steel can make weapons and military equipment lightweight and have higher mobility. However, aluminum alloy parts have problems such as low hardness, poor wear resistance and difficulty in lubrication. For example, in the erection of military bridges, since the steel-aluminum ...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 谭业发王小龙徐婷谭华周春华高立洪翔李静肖楚璠
Owner 中国人民解放军理工大学野战工程学院
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