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

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 ...

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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 is not good; the preparation process of physical vapor deposition and chemical vapor deposition is complex, and requires expensive equipment, it is difficult to implement surface treatment of large-scale aluminum alloy components, and physical vapor deposition The bonding strength between the deposited coating and the aluminum alloy substrate is low, and chemical vapor deposition will cause thermal deformation of the aluminum alloy substrate; the plasma spraying method, the prepared coating and the aluminum alloy substrate are difficult to achieve metallurgical bonding, and the bonding strength is low , and cause severe thermal stress and deformation of the aluminum alloy base material, and the coating is prone to peeling and failure under high load and impact load

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