A kind of method for preparing alumina-dispersed copper by external oxidation

Abstract

The invention discloses a method for preparing aluminum oxide dispersed copper by means of external oxidation. The method comprises the following steps: 1. performing sufficient external oxidation treatment on aluminum-copper alloy powder; mixing; 3. deoxidizing and hot-pressing sintering the specific oxidized alloy powder; 4. densifying the dispersed aluminum-copper billet to obtain alumina dispersed copper. The present invention fully oxidizes the aluminum-copper alloy powder, and the aluminum in it is oxidized preferentially, which can greatly reduce the oxidation of the copper powder. After mixing the external alumina-copper alloy powder and copper powder, deoxidation hot-press sintering is carried out. The oxidized part of the copper powder is reduced and solid-phase sintered to form, the reduction and profile preparation process are combined, there is no secondary oxidation process, the performance of aluminum oxide dispersed copper is improved, and the structure of the dispersed aluminum copper billet is enhanced by densification treatment Strength, the doped phase is fully oxidized, and the composition is uniformly controlled in aluminum oxide dispersed copper.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for preparing alumina-dispersed copper by means of external oxidation. Background technique [0002] Copper has excellent electrical conductivity, thermal conductivity and machinability, and has a wide range of applications in cables, electrical and electronic components. However, copper has the characteristics of poor strength and non-wear resistance at the same time. It is difficult to meet the requirements in applications that require structural strength. While traditional processing and strengthening improve the mechanical properties, it will also greatly reduce the electrothermal properties of copper. Therefore, Preparation with good wear resistance and mechanical properties, while retaining high electrical and thermal properties, is an important trend in the development of copper matrix composites. [0003] Alumina-dispersed copper is the a...

AI Technical Summary

Problems solved by technology

At present, there are many technical methods for preparing alumina dispersed copper that can be found, but the main method is powder metallurgy, especially the internal oxidation method is the most widely used, and it is also the main method used in actual industrial production. This method Still facing some technical difficulties, its disadvantages are: a large amount of copper powder will be oxidized during the oxidation process of aluminum-copper alloy, and secondary oxidation will be caused in the screening and reuse process after reduction, and the aluminum in the pre-alloying is not sufficiently oxidized. And problems such as the control of the oxygen balance in the material matrix after reduction, especially the oxygen content of the final material, not only is it difficult to remove itself, but there is also the risk of secondary oxidation during the process flow, which eventually leads to a significant decline in material performance or even a risk of failure

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