Laser-cladded composite wear-resisting layer on surfaces of copper and copper alloys and preparation method

Abstract

The invention relates to a laser-cladded composite wear-resisting layer on the surfaces of copper and copper alloys and a preparation method. The composite wearing layer is a multi-layered laser cladding layer comprising at least two or more than two layers, wherein the coating connected with a substrate is the first layer, which is also called as a transition layer and is a copper-based alloy prepared from the following components in percentage by weight: 20.0-30.0 percent of Cu, 6.0-8.0 percent of Al, 0.3-0.6 percent of Si, 1.7-2.4 percent of Zr and the balance of Ni; and the rest layer is a cobalt-based alloy prepared from the following components in percentage by weight: 1.0-1.5 percent of C, 25-30 percent of Cr, 2-4 percent of Fe, 10-15 percent of W, 0.8-1.2 percent of Si, 3-4 percent of B, 8-12 percent of Ti, 10-12 percent of Ni and the balance of Co. The composite wear-resisting layer provided by the invention has compact tissues without cracks or pores and forms favorable metallurgy combination with the surfaces of copper and copper alloys. The preparation method provided by the invention can be used for accurately controlling the thickness of the composite wear-resisting layer and automatically controlling the whole process, and has the advantages of low energy consumption, no pollution, high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of material science, in particular to a laser cladding composite wear-resistant layer on the surface of copper and copper alloy and a preparation method thereof. Background technique [0002] Copper has good conductivity and good mechanical properties, so copper alloy is an indispensable metal material in industry, and has been widely used in electric appliances, machinery manufacturing, aerospace and other industries. In recent years, the sharp rise in copper prices has further increased the cost of copper alloy parts. With the rapid development of science and technology, there is an urgent need to improve the performance of copper alloy materials. It is required to ensure high thermal conductivity or high electrical conductivity. Improve its hardness, wear resistance and arc ablation resistance. Therefore, surface modification is an effective way to prolong the service life of copper alloy parts and reduc...

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Problems solved by technology

[0008] 3) Insufficient toughness in the coating, defects such as thermal cracking and stress exist inside the coating

However, the process is slightly complicated, and plasma spraying and high-power CO 2 Laser equipment is bulky and expensive

In addition, the patent "A New Method for Surface Coating of Copper Metal in Continuous Casting Mold" (Patent Publication No. 101294282) invented a method for coating the surface of copper metal in the mold. Pulsed laser beams irradiate metal surfaces, but metal flakes and filaments are difficult to process and difficult to operate for large-area cladding

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