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A kind of preparation method of copper alloy

A copper alloy and alloy powder technology, which is applied in the field of copper alloy preparation, can solve the problems of performance evaluation, grain growth, immaturity, etc., and achieve the effect of solving rapid growth, high strength and electrical conductivity, and improving strength

Active Publication Date: 2017-12-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The existing problems are: 1) The cost of deformed in-situ composite copper-based alloy is high; 2) The strengthening mechanism needs to be further explored; 3) The microstructure still needs further research; 4) Performance evaluation
In the conventional sintering process, the sintering temperature of the powder must reach at least 70% of its melting point, and the high temperature process will promote the growth of the grains, making it difficult to prepare sintered products with ultra-fine and nano-microstructures.
Therefore, due to these difficulties, the current method for preparing high-strength and high-conductivity copper alloys is still immature, and it is difficult to realize the preparation of high-strength and high-conductivity copper alloys.

Method used

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  • A kind of preparation method of copper alloy
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  • A kind of preparation method of copper alloy

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preparation example Construction

[0032] The embodiment of the invention discloses a method for preparing a copper alloy, comprising the following steps:

[0033] Perform high-energy ball milling of copper powder and chromium powder in a protective atmosphere to obtain nano-copper alloy powder, the content of chromium powder in the nano-copper alloy powder is greater than 0 and less than or equal to 2wt%, and the balance is copper powder;

[0034] The nano-copper alloy powder is cold-pressed and then sintered to obtain a copper alloy.

[0035] This application uses copper powder and chromium powder as raw materials, and uses ball milling and activation sintering methods to prepare a copper alloy with high strength and high electrical conductivity.

[0036] According to the present invention, copper powder and chromium powder are firstly subjected to high-energy ball milling. The high-energy ball mill is a ball milling method that uses grinding media to impact, rub, and shear materials in a high-frequency vibrat...

Embodiment 1

[0042] a) Put 39.2g of copper powder and 0.8g of chromium powder into a ball mill pot with a ball-to-material ratio of 10:1, add 0.8ml of acetone as an anti-forging agent, and obtain a high-activity powder after ball milling for 6 hours;

[0043] b) cold-press forming the high-activity powder with a pressure of 300 MPa and a holding time of 3 minutes to obtain a green body;

[0044] c) Place the shaped green body in a high-temperature furnace and sinter it under argon gas at a temperature of 750° C. After holding the temperature for 3 minutes, apply a pressure of 200 MPa during sintering to obtain a high-strength and high-conductivity copper alloy material.

[0045] figure 1 and figure 2 Respectively, the XRD figure and TEM photo of the highly active powder prepared in Example 1 of the present invention, by figure 1 and figure 2 It can be seen that after the raw material powder is subjected to high-energy ball milling, nano-scale copper alloy powder is prepared, and the a...

Embodiment 2

[0047] a) Put 39.6g of copper powder and 0.4g of chromium powder into a ball milling tank with a ball-to-material ratio of 10:1, add 0.7ml of acetone as an anti-forging agent, and obtain a high-activity powder after ball milling for 5.5 hours;

[0048] b) cold-press forming the high-activity powder with a pressure of 300 MPa and a holding time of 3 minutes to obtain a copper alloy green body;

[0049] c) Place the formed copper alloy green body in a high-temperature furnace and sinter it under argon gas at a temperature of 700° C. After holding for 3 minutes, apply a pressure of 200 MPa during sintering to obtain a high-strength and high-conductivity copper alloy material. The copper alloy material prepared in this embodiment was tested after being polished, and the relative density was 99.3%, the tensile strength was 630 MPa, and the electrical conductivity was 86% IACS.

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Abstract

The application provides a method for preparing a copper alloy, which includes the following steps: performing high-energy ball milling on copper powder and chromium powder under a protective atmosphere to obtain nano-copper alloy powder, and the content of chromium powder in the nano-copper alloy powder The content is greater than 0 and less than or equal to 2.0 wt%, and the balance is copper powder; the nano-copper alloy powder is cold-pressed and then sintered to obtain a copper alloy. This application aims at the problem that it is difficult to obtain copper alloys with both high strength and high conductivity in the prior art. Through the combination of high energy ball milling and in-situ activation sintering, high strength and high conductive copper alloy.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a method for preparing a copper alloy. Background technique [0002] According to strength and conductivity, high-performance copper alloys can be divided into three categories: (1) High-conductivity copper alloys, mainly based on Cu-Fe-P and Cu-Ag systems, with a strength below 400MPa and a conductivity of 80% IACS above; (2) ultra-high-strength copper alloy, mainly Cu-Ni-Si system, with strength above 600MPa, conductivity above 50% IACS; (3) high-strength and high-conductivity copper alloy, mainly Cu-Cr-Zr Mainly, the strength is above 600MPa, and the conductivity is above 80%IACS. Among them, high-strength and high-conductivity copper alloys are the most important research hotspot in the field of copper alloys. [0003] High-strength and high-conductivity copper alloy is a kind of structural functional material with excellent physical and mechanical properties. It is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/04
CPCC22C1/0425C22C9/00
Inventor 刘建伟马贤锋赵伟汤华国赵振业韩力涛
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI