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Method for preparing contact material having high performance and low mixed copper-chromium alloy content

A copper-chromium alloy and contact material technology, applied in the direction of electrical components, electric switches, circuits, etc., can solve pollution and other problems, and achieve the effect of simple and convenient operation, uniform alloy microstructure, and uniform alloy composition

Inactive Publication Date: 2010-05-19
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the above-mentioned deficiencies in the methods for preparing CuCr alloys in the prior art, adopts vacuum electromagnetic levitation smelting preparation technology, and provides a copper-chromium alloy contact material for preparing high-performance, low-oxygen, low-nitrogen, and low-inclusions, Greatly improve the performance of copper-chromium alloy contact material, and fundamentally solve the pollution problem of crucible material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the copper block and the chromium block each accounting for 50% of the total weight, put them into a vacuum non-consumable arc melting furnace, and evacuate to 8.0×10 -4 After Pa is filled with high-purity argon to 0.6MPa, the power is turned on and the arc is melted into an alloy prefabricated ingot. Push it into the high-frequency induction coil, and evacuate to 7.0×10 -4 After the Pa is filled with high-purity argon to 0.6MPa, the high-frequency power supply is connected, the input current and power are adjusted, the alloy prefabricated ingot is suspended under the action of electromagnetic force, and heated and melted, and the temperature of the alloy ingot is observed by an infrared thermometer After the alloy ingot is completely melted, keep it warm for 10-30 seconds (so that the dissolved gas in the alloy sample can be volatilized as much as possible, reduce the relevant gas content and mix the two evenly), quickly turn off the power, and the sample falls to...

Embodiment 2

[0029] Take the weight ratio of copper block and chromium block as 85:15, vacuumize to 1.5×10 -3 After Pa is filled with high-purity argon to 0.3MPa, induction melting is carried out and cast into alloy prefabricated ingots. The obtained alloy prefabricated ingots are placed in a vacuum electromagnetic levitation melting furnace, and the alloy ingots are pushed into the In the high-frequency induction coil, vacuumize to 1.5×10 -3 After the Pa is filled with high-purity argon to 0.3MPa, the high-frequency power supply is connected, the input current and power are adjusted, the alloy prefabricated ingot is suspended under the action of electromagnetic force, and heated and melted, and the temperature of the alloy ingot is observed by an infrared thermometer , remove the alumina ceramic support rod, after the alloy ingot is completely melted, keep it warm for 10-30 seconds, blow high-purity helium from the hollow alumina ceramic rod, and cool and solidify the sample under high-pu...

Embodiment 3

[0031] Take a copper block and a chromium block with a weight ratio of 70:30, put it into the vacuum induction melting, and evacuate to 1.0×10 - 3 After Pa is filled with high-purity argon to 0.5MPa, induction melting is carried out and cast into an alloy preform, and the obtained alloy preform is put into a cold crucible melting furnace, and the vacuum is evacuated to 1.0×10 -3 After Pa is filled with high-purity argon gas to 0.5MPa, the high-frequency power supply is connected, the input current and power are adjusted, the alloy prefabricated ingot is suspended under the action of electromagnetic force, and heated and melted, and the temperature of the alloy ingot is observed by an infrared thermometer , after the alloy ingot is completely melted, keep it warm for 10-30 seconds, turn off the power quickly, the sample falls into the copper crucible under the action of gravity, cool and solidify rapidly to obtain the alloy ingot.

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Abstract

The invention discloses a method for preparing a contact material having high performance and low mixed copper-chromium alloy content. The method comprises the following steps of: (1) mixing a metal copper material and a metal chromium material according to a proportion of 10-75 weight percent of the weight content of the chromium to prepare a sample according to alloy components required by a process; (2) pressing the prepared mixed material powder into blocks, or preparing the prepared mixed material powder into alloy prefabricating ingots through vacuum induction smelting or vacuum non-consumable arc smelting; (3) under the protection of inert gas, heating and smelting the alloy prefabricating ingots in a vacuum electromagnetic suspension stove or a cold crucible stove through high-frequency induction; and (4) cooling and solidifying by adopting high-purity inert gas or a water-cooling copper crucible to obtain copper-chromium alloy ingots. The preparation method has uniform alloy components, low content of gas such as oxygen, nitrogen, and the like, dense texture, uniform component, high purity and fewer impurities, greatly improves the performance of the copper-chromium alloy contact material, can avoid pollution of crucible materials to the alloy at high temperature and ensures that the microscopic structure of the alloy is more uniform.

Description

technical field [0001] The invention relates to a method for preparing a copper-chromium alloy contact material used in the field of electrical materials, in particular to a method for producing a high-performance and low-inclusion copper-chromium alloy contact material by using an electromagnetic levitation smelting technology. Background technique [0002] Copper-chromium (CuCr) alloy is widely used as a contact material for medium and high voltage vacuum circuit breakers, and has good withstand voltage and breaking current capability. Among them, the gas and impurity content indicators are the key to determine its performance. When the material contains high oxygen, nitrogen and other gas content or more inclusions, it will greatly damage the contact performance and even cannot be used. Therefore, continuously reducing the gas content in the material and reducing the contamination of inclusions is the key to the development of high-performance CuCr contact materials. ...

Claims

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Application Information

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IPC IPC(8): C22C1/02H01H11/04
Inventor 周志明唐丽文夏华彭成允张弛李又兵雷彬彬曹敏敏
Owner CHONGQING UNIV OF TECH
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