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Preparation method of fine-grained CuCr alloy

A fine-grained and alloyed technology, applied in the field of preparation of fine-grained CuCr alloys, to achieve the effects of narrow particle size distribution, shortened time and high yield

Active Publication Date: 2015-09-30
NORTHEASTERN UNIV
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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

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  • Preparation method of fine-grained 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) 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 uniform particle size distribution. fine-grain composite CuCr alloy powder...

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Abstract

The invention provides a preparation method of a fine-grained CuCr alloy, which comprises the processing steps that (1) an oxygen-free copper block and a chromium block are subjected to induction heating to be molten and dissolved mutually, molten liquid is ejected by argon gas pressure and subjected to centrifugal atomization by a copper roller rotation quenching melt spinning or a water-cooling rotating disk; (2) a fine-grained CuCr alloy material is subjected to ball milling by a high-energy ball mill under argon shield; (3) fine-grained composite CuCr alloy powder is loaded into a mould briquette to be made into a green blank; and (4) the green blank is loaded into a graphite drying pot, and placed in a vacuum sintering furnace to be sintered to form the fine-grained CuCr alloy. In the fine-grained CuCr alloy prepared by the method, the particle sizes of chromium particles are 0.5-10 micrometers, the surface hardness is 65-162HV, and the conductivity is 26.0-80.8% IACS (International Annealed Copper Standard); compared with the existing CuCr alloy with the equivalent chromium content, the particle sizes are reduced obviously, and the alloy performance is improved significantly; and the fine-grained CuCr alloy has more excellent effect in an application of an electrical contact material.

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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IPC IPC(8): C22C1/04C22C9/00
Inventor 佟伟平杨旭沈德鹏
Owner NORTHEASTERN UNIV
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