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A method for preparing precipitation-strengthened copper-chromium alloys in a short process

A copper-chromium alloy and precipitation-strengthening technology, which is applied in the field of short-process preparation of precipitation-strengthened copper-chromium alloy, can solve the problems of incompatibility between hardness and electrical conductivity, and long production cycle, and achieve fine grain size, short production cycle, and high conductivity. Improved effect

Active Publication Date: 2016-04-06
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing precipitation-strengthened copper-chromium alloys with a short process, which solves the problems of long production cycle and incompatibility of hardness and electrical conductivity in existing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Melt the industrial copper-chromium alloy in an intermediate frequency induction melting furnace. After the alloy is completely melted and the melting temperature is 1300°C, pour it into a preheated drainage crucible for atomization to obtain fine-grained supersaturated copper-chromium alloy powder;

[0026] Step 2, pour the copper-chromium alloy powder prepared by the gas atomization method into a Φ21 steel mold, shake it flat, and press it with a pre-pressure of 10 MPa on a TM-106 hydraulic press to ensure that the powder is in contact but not deformed, that is Obtain the copper-chromium alloy pre-pressed sample;

[0027] Step 3, the copper-chromium alloy pre-pressed sample obtained by pre-pressing is activated in a spark plasma sintering furnace using its discharge pulse, and the average pulse current density is 300A / mm 2 , the processing power-on time is 60s; the processed sample is put into the copper sheath and welded to prepare for extrusion;

[0028] S...

Embodiment 2

[0032] Step 1: Melt the industrial copper-chromium alloy in an intermediate frequency induction melting furnace. After the alloy is completely melted and the melting temperature is 1300°C, pour it into a preheated drainage crucible for atomization to obtain fine-grained supersaturated copper-chromium alloy powder;

[0033] Step 2, pour the copper-chromium alloy powder prepared by the gas atomization method into a Φ21 steel mold, shake it flat, and press it on a TM-106 hydraulic press with a pre-pressure of 8 MPa to ensure that the powder is in contact but not deformed, that is Obtain the copper-chromium alloy pre-pressed sample;

[0034] Step 3, the copper-chromium alloy pre-pressed sample obtained by pre-pressing is activated in a spark plasma sintering furnace using its discharge pulse, and the average pulse current density is 200A / mm 2 , the processing power-on time is 90s; the processed sample is put into the copper sheath and welded to prepare for extrusion;

[0035] St...

Embodiment 3

[0039] Step 1: Melt the industrial copper-chromium alloy in an intermediate frequency induction melting furnace. After the alloy is completely melted and the melting temperature is 1300°C, pour it into a preheated drainage crucible for atomization to obtain fine-grained supersaturated copper-chromium alloy powder;

[0040] Step 2, pour the copper-chromium alloy powder prepared by the gas atomization method into a Φ21 steel mold, shake it flat, and press it on a TM-106 hydraulic press with a pre-pressure of 9 MPa to ensure that the powder is in contact but not deformed, that is Obtain the copper-chromium alloy pre-pressed sample;

[0041] Step 3, the copper-chromium alloy pre-pressed sample obtained by pre-pressing is activated in a spark plasma sintering furnace using its discharge pulse, and the average pulse current density is 500A / mm 2 , the treatment power-on time is 120s; the treated sample is put into the copper sheath and welded to prepare for extrusion;

[0042] Step...

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Abstract

A short-process method for preparing precipitation-strengthened copper-chromium alloys. Industrial-use copper-chromium alloys are prepared by gas atomization into fine-grained supersaturated copper-chromium alloy powders, which are then pre-pressed, activated by electric pulses, and then extruded , and the extruded bar is subjected to secondary aging treatment to obtain a precipitation-strengthened copper-chromium alloy. The precipitation-strengthened copper-chromium alloy prepared by the method of the present invention has fine grains and precipitated phases exist inside the grains, and its hardness is increased by 30% to 40% compared with the homogeneous traditional copper-chromium alloy, and the electrical conductivity is greater than 80% IACS at the same time , which provides a new method for the preparation of precipitation-strengthened copper-chromium alloys in a short process.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and in particular relates to a short-flow method for preparing a precipitation-strengthened copper-chromium alloy. Background technique [0002] Cu-Cr (-Zr) is a representative of the family of precipitation-strengthened copper-chromium alloys. It is by adding Cr (-Zr) alloy elements with low solid solubility to copper, through high temperature solution treatment, so that the alloy elements form supersaturated solid solution in the copper matrix, and then through the subsequent aging treatment, so that the over The saturated solid solution decomposes, and the Cr (-Zr) element will be dispersed in the matrix as fine particles to form a precipitated phase. This alloy system is widely used in railway, electric power, electronics, national defense and other fields due to its high strength and high conductivity. [0003] The existing methods for preparing strengthened copper-chromium alloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C9/00C22F1/08
Inventor 梁淑华张乔宋克兴杨卿肖鹏郑李媛
Owner XIAN UNIV OF TECH