A preparation method of powder metallurgy copper-iron alloy strip with excellent bending performance

Abstract

The invention discloses a method for preparing a powder metallurgy copper-iron alloy strip material with excellent bending performance. The mass percentage of the copper-iron alloy is composed of Fe: 10-50 wt%, and the balance is Cu and unavoidable impurities; it is characterized in that: It includes the following preparation steps: 1) batching: batching according to the required iron powder and copper powder, wherein the spherical iron powder accounts for 5-15 wt% of the total iron powder mass, and the balance is flaky iron powder; 2) ball milling and mixing: mixing Iron powder and copper powder are mixed in a ball mill; 3) Powder heating: heat the uniformly mixed copper-iron alloy powder at a heating temperature of 300-400°C, keep it warm for 4-6 hours, and use reducing gas protection during heating. In the present invention, by introducing two kinds of iron powders in different forms, a fibrous iron phase structure uniformly distributed in the refined structure is formed, and the bending property of the pure fibrous structure is improved.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a preparation method of a powder metallurgy copper-iron alloy strip with excellent bending performance. Background technique [0002] Copper-iron alloy has the characteristics of copper's electrical conductivity, thermal conductivity, and ductility, as well as the high strength, wear resistance, and electromagnetic shielding properties of iron, and has strong and effective antibacterial properties. As a new material, it is widely used in medical and health, Electronic information, aerospace and other aspects have great application prospects. [0003] Due to the huge difference in the melting points of copper and iron elements, the copper-iron alloy solution in the molten state with an iron content higher than 3% will appear immiscible, so traditional casting is prone to iron phase segregation. Although there are currently some methods that can improve the defec...

AI Technical Summary

Problems solved by technology

Due to the inherent shortcomings of powder metallurgy itself, the prepared blank cannot reach the density of traditional casting, so the requirements for subsequent processing technology are relatively high, otherwise the strength and conductivity performance will be low

In addition, the density of the billet is not high, which will eventually lead to various defects in the product, and it is easy to bend and crack. At present, the electronics industry has higher and higher requirements for the bending performance of copper alloy strips.

[0005] In addition, the increase of Fe content will increase the hard phase of Fe phase. Although the strength of the copper-iron alloy strip will increase, it will also reduce the bending performance of the copper-iron alloy to a certain extent.

Images