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A kind of method for preparing fine-grain cucr alloy

A technology of fine-grained and alloyed, applied in the field of preparation of fine-grained CuCr alloy, to achieve the effect of wide application range, narrow particle size distribution range and high yield

Active Publication Date: 2017-09-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the preparation performance of existing CuCr electrical contact materials, the present invention provides a method for preparing fine-grained CuCr alloys. Firstly, submicron-sized fine CuCr composite powders are prepared and then processed into compacts by pressure processing, and finally CuCr alloy with uniform composition distribution and fine chromium particles prepared by liquid phase sintering

Method used

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  • A kind of method for preparing fine-grain cucr alloy
  • A kind of method for preparing fine-grain cucr alloy
  • A kind of method for preparing fine-grain cucr alloy

Examples

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Effect test

Embodiment 1

[0031] The weight percentage of preparation chromium is the CuCr alloy of 50%, and process step is as follows:

[0032] (1) Preparation of fine-grained CuCr alloy material: Put the oxygen-free copper block and the chromium block into the crucible with a nozzle at the bottom according to the mass ratio of 1:1, induction heating to melt and dissolve the copper block and the chromium block, and pressurize the argon gas The molten liquid is sprayed out and passed through the copper roll to quickly cool and throw the belt, wherein the copper roll speed is 1000r / min, and a thin strip-shaped fine-grained CuCr alloy material is obtained; figure 1 As shown, the particle size of chromium particles is 0.1~1μm;

[0033] (2) Refining fine-grained CuCr alloy material: The thin-sheet strip-shaped fine-grained CuCr alloy material is ball-milled with a high-energy ball mill under the protection of argon, and the mass ratio of the ball milling ball to the alloy material is 10:1 to obtain a unif...

Embodiment 2

[0038] The weight percentage of preparation chromium is the CuCr alloy of 25%, and process step is as follows:

[0039] (1) Preparation of fine-grained CuCr alloy material: Put the oxygen-free copper block and the chromium block into the crucible with a nozzle at the bottom according to the mass ratio of 3:1, and induce the melting and mutual dissolution of the copper block and the chromium block. The molten liquid is sprayed out and passed through the copper roll to quickly cool and throw the belt, wherein the copper roll speed is 1000r / min, and a thin strip-shaped fine-grained CuCr alloy material is obtained; figure 2 , image 3 As shown, the chromium particle size is 0.1~1μm

[0040] (2) Refined fine-grained CuCr alloy material: The thin-sheet strip-shaped fine-grained CuCr alloy material is ball-milled with a high-energy ball mill under the protection of argon, and the mass ratio of the ball milling ball to the alloy material is 3:1 to obtain a uniform particle size dist...

Embodiment 3

[0045] The weight percentage of preparation chromium is the CuCr alloy of 50%, and process step is as follows:

[0046] (1) Preparation of fine-grained CuCr alloy material: put the oxygen-free copper block and the chromium block into the crucible with a nozzle at the bottom according to the mass ratio of 1:1, induction heating to melt and dissolve the copper block and the chromium block, and pressurize the argon gas The molten liquid is sprayed and sprayed through a water-cooled rotating disk for centrifugal atomization, wherein the rotating disk rotates at a speed of 7000r / min to obtain granular fine-grained CuCr alloy materials;

[0047] (2) Refined fine-grained CuCr alloy material: The thin-sheet strip-shaped fine-grained CuCr alloy material is ball-milled with a high-energy ball mill under the protection of argon, and the mass ratio of the ball milling ball to the alloy material is 10:1 to obtain a uniform particle size distribution. fine-grain composite CuCr alloy powder;...

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Abstract

The invention provides a method for preparing a fine-grained CuCr alloy. The process steps are: (1) Inductively heating the oxygen-free copper block and the chromium block to melt and dissolve the copper block and the chromium block, and spray the molten liquid through argon pressurization. Copper roller rotating quenching belt or water-cooled rotating disc centrifugal atomization; (2) Fine-grained CuCr alloy material is ball-milled by high-energy ball mill under the protection of argon; (3) Fine-grained composite CuCr alloy powder is packed into a mold to make a compact (4) Put the compact into a graphite dry pot, put it into a vacuum sintering furnace for sintering to obtain a fine-grained CuCr alloy. The fine-grained CuCr alloy prepared by the present invention has a particle size of chromium particles of 0.5-10 μm, a surface hardness of 65-162 HV, and an electrical conductivity of 26.0-80.8% IACS, which is significantly smaller than that of existing CuCr alloys with the same chromium content. Small, the performance of the alloy has been significantly increased, and it has a more excellent effect in the application of electrical contact materials.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, in particular to a method for preparing fine-grained CuCr alloy. Background technique [0002] Electric contacts are contact elements of electrical switching instruments and meters, and are responsible for the task of connecting and disconnecting circuits and load currents. Therefore, its performance directly affects the reliable operation of switching appliances. The invention of CuCr alloy as a contact material is an important breakthrough in the history of the development of electric vacuum switches. It greatly improves the performance of vacuum switches. After decades of continuous research and development, CuCr alloy has basically replaced other materials and has become The preferred material for high-current vacuum switches is gradually developing in the direction of high voltage, large capacity, low current cut-off, and miniaturization. Therefore, higher requirements are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C9/00
Inventor 佟伟平杨旭沈德鹏
Owner NORTHEASTERN UNIV LIAONING
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