A kind of preparation method of composite structure of copper-aluminum transition section

Abstract

The invention discloses a method for preparing a composite structure of a copper-aluminum transition section, which comprises the following steps: (1) using copper powder on a copper body to print a copper skeleton using laser 3D printing technology; (2) filling the gap of the copper skeleton with aluminum melt (3) Based on the upper surface of the copper-aluminum composite structure, use aluminum alloy powder to print aluminum entities on the copper-aluminum composite structure by laser 3D printing method. This method combines laser 3D printing technology with vacuum negative pressure infiltration method to build a copper skeleton at the copper-aluminum transition section, uses layered software to design the porosity of each layer, and forms any complex structure on the copper entity near net without The mold and subsequent processing process save material costs and labor time; the copper skeleton with an interconnected three-dimensional structure increases the contact area of ​​the aluminum solution, and the transition from copper to aluminum forms a step-by-step interface feature. Copper has a high bond strength and a low risk of fracture.

Description

technical field [0001] The invention relates to a preparation method of a composite structure, more particularly, to a preparation method of a copper-aluminum transition section composite structure. Background technique [0002] In the power system, a large amount of conductive materials need to be consumed. The terminals of many devices are made of copper, while the overhead wires are made of aluminum. For copper-aluminum transition joints, welding is generally used. Once there is a small gap, it may be corroded and oxidized, which not only increases the contact resistance, but also leads to a decrease in bonding strength and fracture, shortening the service life and threatening security of the power supply system. With the popularization of metal 3D printing technology, since the closed environment in the forming chamber is a vacuum state or the oxygen content is less than 100ppm, the density of parts formed by metal 3D printing technology can reach more than 99.9%, and t...

AI Technical Summary

Problems solved by technology

At present, the forming process of copper, copper alloy, and aluminum alloy tends to be mature, but the existing equipment can only form the same metal material at a time. If another metal material is formed on the prepared part, contact failure will inevitably occur at the transition section. The matching problem leads to weak bonding strength, especially for the copper-aluminum transition section, the high laser reflectivity and thermal conductivity make the interface transition section of the two materials easy to form metallurgical defects, and the increase in contact resistance leads to heating and oxidation. Easy to break during operation, burying serious safety hazards

Images