Preparation method of Cu-Al2O3 dispersion strengthened Cu-based composite coating

Abstract

The invention discloses a preparation method of a Cu-Al2O3 dispersion strengthened Cu-based composite coating. The preparation method specifically comprises the steps of conducting pretreatment on thesurface of a workpiece to be coated, selecting appropriate coating parameters according to the cold spraying process, and spraying Cu-Al alloy powder onto the surface of the pretreated workpiece to prepare a high-performance Cu-Al alloy coating; and finally, selecting appropriate internal oxidation treatment parameters through an internal oxidation method, promoting an Al phase in the Cu-Al alloycoating to have an in-situ reaction to generate an Al2O3 dispersed phase, and preparing the Cu-Al2O3 dispersion strengthened Cu-based composite coating. During the internal oxidation treatment process, the Al phase in the alloy coating has the in-situ reaction to generate the nanoscale Al2O3 dispersed phase, and the nanoscale Al2O3 dispersed phase is pinned inside deposited particles or at the interfaces of the deposited particles to hinder dislocation motion and improve the mechanical performance of the coating. Moreover, unbound interfaces between the as-sprayed coating particles are locally bound through diffusion in the internal oxidation treatment process, and the performance of the coating is further improved.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a copper-aluminum oxide dispersion-strengthened copper-based composite coating. Background technique [0002] Dispersion strengthened copper matrix composites have good electrical and thermal conductivity and high temperature creep resistance. Dispersion-strengthened copper-based composites use copper as the matrix, and use dispersed second-phase nanoparticles to strengthen the matrix alloy. The most commonly used reinforcing phase for dispersion strengthened copper matrix composites is Al 2 o 3 , this is mainly because Al 2 o 3 It has extremely high melting point, strong and complete crystal lattice, inactive chemical properties, good thermodynamic stability, and does not react with Cu matrix. In addition, Al 2 o 3 Even under high temperature conditions (>900°C), the particles are not easy to grow obviously. Therefore, t...

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Problems solved by technology

At present, the preparation techniques of dispersion strengthened copper matrix composites include powder metallurgy, mechanical alloying, co-precipitation, sol-gel, reactive spray deposition, composite electrodeposition and internal oxidation, etc., but due to these preparation Problems such as complex process, high cost, and single sample shape cannot meet complex working conditions, which greatly limits the application of dispersion-strengthened copper-based composites

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