Method for reinforcing nickel-base alloy layer on aluminum alloy surface

Abstract

The invention discloses a method for reinforcing a nickel-base alloy layer on an aluminum alloy surface, which comprises the following steps: doping rare earths La and Ce in a certain proportion into nickel-base alloy powder, and carrying out laser surface cladding to obtain a metallurgically-bonded high-hardness high-wear-resistance high-corrosion-resistance nickel-base alloy layer on the aluminum alloy surface. The hardness of the nickel-base alloy layer is up to 1350HV, and the wear resistance and corrosion resistance are respectively doubled as compared with the prior art. The invention has an important function on widening the application range of the aluminum alloy and expanding the application of the aluminum alloy in the high technology field.

Description

technical field [0001] The invention relates to a technical method for modifying the surface of an aluminum alloy, in particular to a method for strengthening a nickel-based alloy layer on the surface of an aluminum alloy by adding rare earth elements. Background technique [0002] As we all know, aluminum alloy has many excellent properties such as low density, low thermal expansion coefficient, high specific stiffness and specific strength, good thermal conductivity, corrosion resistance and good formability, so it is widely used in aerospace, automobiles, home appliances, advanced manufacturing, electric power It is widely used in many fields, but in terms of the properties of aluminum alloy, it also has the disadvantages of relatively low hardness, high friction coefficient and easy wear and scratch due to poor wear resistance and difficult lubrication of the contact surface. This limits the scope of use of aluminum alloys. In recent years, the use of aluminum alloy sur...

AI Technical Summary

Problems solved by technology

Although the previous methods can improve the corrosion resistance and wear resistance of the aluminum alloy surface, the reinforced layer obtained is relatively thin (only a few hundred microns), and the reinforced layer and the substrate are mechanical bonding interfaces or diffusion bonding interfaces. , the bonding strength is not high, so the wear resistance is still not high, and it is easy to crack, fall off, etc.

Although the more commonly used anodic oxidation method has a simple process, it cannot form a continuous oxide film on the aluminum matrix composite material, and cannot effectively prevent corrosion of the substrate, and the chromate produced in the production is very toxic, which is harmful to the aluminum matrix composite material. The environment is prone to serious pollution and endangers people's health

[0003] Among the several strengthening methods mentioned above, the laser surface strengthening method is one of the effective methods to obtain high surface hardness and excellent corrosion resistance and wear resistance of aluminum alloy, and this method also has the characteristics of high efficiency and no pollution. It is one of the methods with better application prospects at present, but in the prior art, the aluminum alloy surface laser treatment method is mainly to clad copper-based, nickel-based and iron-based alloys or composite materials on the aluminum alloy surface, although this can greatly Improve the wear resistance and corrosion resistance of the aluminum alloy surface, but in some important and key areas, the properties of this aluminum alloy cladding layer, especially its hardness and wear resistance, still cannot meet the process and use requirements