Preparation method of copper-chromium alloy powder and preparation method of copper-chromium alloy pig

A technology of copper-chromium alloy and powder, which is applied in the application field of the metal powder, can solve the problems of high gas content, complex process, coarse Cr particles, etc., and achieve the advantages of high gas content, uniform fine distribution, and high anti-welding performance Effect

Inactive Publication Date: 2012-10-24
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have certain shortcomings: the contact microstructure made by the infiltration method is not uniform; the disadvantage of the melting casting method is that there are many inclusions and the Cr particles are thick; the disadvantage of the arc melting method is that the process is complicated and the cost is high.
The powder produced by this method is relatively coarse, with low sphericity and high gas content, which is not conducive to the production of powder mixed contact pieces with fine Cr phase, uniform distribution and low gas content.

Method used

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  • Preparation method of copper-chromium alloy powder and preparation method of copper-chromium alloy pig
  • Preparation method of copper-chromium alloy powder and preparation method of copper-chromium alloy pig
  • Preparation method of copper-chromium alloy powder and preparation method of copper-chromium alloy pig

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 5.25 kg of copper and 1.75 kg of chromium into the ceramic crucible of the vacuum induction melting furnace, and first evacuate to 10 -3 -10 -4 Pa, and then filled with an inert protective gas such as argon or nitrogen with a mass purity greater than 99%. Turn on the heating power to melt the raw materials by induction heating. And heat the molten alloy for 1 to 10 minutes. The smelted alloy liquid is introduced from the outlet into the guide tube of the atomization chamber with a diameter of 6.0mm, and flows from the guide tube into the atomization nozzle. Under the action of the high-pressure nitrogen gas flow at a pressure of 0.2MPa, Immediately after spraying from the atomizing nozzle, it is atomized into small droplets with a size of 1-1000 microns; the molten droplets are rapidly cooled and solidified into solid alloy powders of the same size during the falling process. Collect the powder and sieve it through a 150-micron sieve to remove particles larger t...

Embodiment 2

[0028] Put 4.9 kg of copper and 2.1 kg of chromium into the ceramic crucible of the vacuum induction melting furnace, and first evacuate to 6.0Χ10 -3 After Pa, it is filled with an inert protective gas such as argon with a mass purity greater than 99%. Turn on the heating power to melt the raw materials by induction heating. And heat the molten alloy for 1 to 10 minutes. The smelted alloy liquid is introduced from the outlet into the guide pipe of the atomization chamber with a diameter of 8.0mm, and flows from the guide pipe into the atomization nozzle. Under the action of the helium gas flow at a pressure of 0.3Mpa, the alloy liquid Immediately after spraying from the atomizing nozzle, it is atomized into small droplets with a size of 1-1000 microns; the molten droplets are rapidly cooled and solidified into solid alloy powders of the same size during the falling process. Collect the powder and sieve it through a 150 micron sieve to remove particles larger than 150 micron ...

example 3

[0032] Take 3.5 kg of copper and 3.5 kg of chromium into the ceramic crucible of the vacuum induction melting furnace, and first evacuate to 4.0Χ10 -3 Pa is filled with an inert protective gas such as helium with a mass purity greater than 99%. Turn on the heating power to melt the raw materials by induction heating. And keep the molten alloy for 10 minutes. The smelted alloy liquid is introduced from the outlet into the guide tube of the atomization chamber with a diameter of 7.0mm, and flows from the guide tube into the atomizing nozzle. Under the action of the helium gas flow at a pressure of 0.4Mpa, the alloy liquid Immediately after spraying from the atomizing nozzle, it is atomized into small droplets with a size of 1-1000 microns; the molten droplets are rapidly cooled and solidified into solid alloy powders of the same size during the falling process. Collect the powder and sieve through a 150 micron sieve to remove particles larger than 150 micron in size, then put ...

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Abstract

The invention discloses a preparation method of copper-chromium alloy powder and a preparation method of a copper-chromium contact, and relates to a preparation method for metal powder and application of the metal powder. The preparation method of the copper-chromium alloy powder comprises the following steps of: preparing a copper bar and a chromium block at the mass ratio of (25-50):(75-50); heating and smelting raw materials into an alloy stream by vacuum induction; enabling the above alloy liquid to flow into an atomizing chamber to be atomized; when the alloy liquid is atomized, continuously introducing inert gas at the pressure of 0.1-0.5Mpa; and screening powder size obtained after atomization by a sieve of 150 micrometers or below 150 micrometers to obtain the copper-chromium alloy powder. The invention provides a preparation method of the copper-chromium alloy powder, and the prepared copper-chromium alloy powder has the advantages of small particle, high nodulizing degree and low air content. The invention also provides a preparation method for a copper-chromium alloy pig, and the prepared copper-chromium alloy pig has the advantages of high density and small pressure required for pressing.

Description

technical field [0001] The present invention relates to a method for preparing metal powder and to the use of the metal powder. Background technique [0002] Copper-chromium (Cu-Cr) alloy contact material is widely used in vacuum circuit breakers because of its good compressive strength and good breaking current capability. Gas, impurity content and microstructure have a great influence on contact performance. Reducing the gas content in the contact material and obtaining a fine and dispersed microstructure are important means to develop high-performance Cu-Cr contact materials. [0003] At present, the methods of producing Cu-Cr alloy contacts at home and abroad mainly include, infiltration method, melting casting method, arc melting method, powder mixing method and so on. These methods have certain shortcomings: the microstructure of the contact made by the infiltration method is not uniform; the disadvantage of the melting casting method is that there are many inclusion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F3/14H01H11/04
Inventor 任红艳王小军王文斌李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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