Preparation of copper-chromium alloy contact material by aluminothermal reduction-electromagnetic casting process

A copper-chromium alloy, electromagnetic casting technology, applied in contact materials, circuits, electrical switches, etc., can solve the problems of restricting the promotion and application of CuCr alloy contact materials, unqualified products, and low product performance. Gold slag separation effect, avoid macro segregation, high density effect

Active Publication Date: 2007-10-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a high-cost, complex-structured vacuum system and a DC arc power supply, resulting in high production costs, and many process parameters need to be further explored and improved.
[0004] The traditional process of preparing CuCr alloy has its own shortcomings and deficiencies. For example, the shortcomings of powder metallurgy and infiltration skeleton sintering process are difficult to overcome, resulting in low product performance, product yield, unqualified products cannot be used, etc., so Seriously limit the promotion and application of CuCr alloy contact material
In addition, there are methods such as plasma spraying and laser surface alloying, but they are all under research.

Method used

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  • Preparation of copper-chromium alloy contact material by aluminothermal reduction-electromagnetic casting process
  • Preparation of copper-chromium alloy contact material by aluminothermal reduction-electromagnetic casting process

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Experimental program
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Effect test

Embodiment 1

[0030] Take CuO, Cr 2 o 3 And Al powder by mass ratio CuO: Cr 2 o 3 : Al powder is a ratio of 100: 114: 160, that is, to ensure that the excess of Al powder is 50%. 2 o 3 and Al powder) the percentage of total mass adds 5% CaF in the raw material 2 , Mix the reactants evenly, then put the reaction mixture into the aluminothermic reduction reaction furnace, add an appropriate amount of Mg powder on the surface of the reactants as an ignition agent, heat the open flame in the air atmosphere to ignite the Mg powder, and initiate the aluminothermic reduction reaction. At the same time, the electromagnetic stirring device is turned on, under the action of electromagnetic field stirring, the gold slag separation process is carried out to obtain a high-temperature copper-chromium alloy melt, and the circulating water is started for circulating water cooling, and the separated high-temperature alloy melt will be continuously cast into graphite In the casting mold, the preheating ...

Embodiment 2

[0032] Take CuO, Cr 2 o 3 And Al powder, by mass ratio CuO: Cr 2 o 3 : The ratio of Al powder is 100: 110: 150, that is, to ensure that the excess of Al powder is about 40%. 2 o 3 and Al powder) the percentage of total mass to add 0.6% Ni as an alloying element, and add 3% of exothermic agent KClO by the percentage relative to the total mass of reactant 3 At the same time, add 2% NaF to the raw material, mix the reactant evenly, then put the reaction mixture into the aluminothermic reduction reaction furnace, add an appropriate amount of Mg powder on the surface of the reactant as an ignition agent, and heat it with an open flame in an air atmosphere to ignite Mg powder, triggering the thermite reduction reaction. At the same time, the electromagnetic stirring device is turned on, under the action of electromagnetic field stirring, the gold slag separation process is carried out to obtain a high-temperature copper-chromium alloy melt, and the circulating water is started ...

Embodiment 3

[0034] Take CuO, Cr 2 o 3 And Al powder, by mass ratio CuO: Cr 2 o 3 : The ratio of Al powder is 100:60:120, that is, to ensure that the Al powder is in excess of 20%, and add 2% of the exothermic agent KClO 3 At the same time, add 3% CaO to the raw material, mix the reactant evenly, then put the reaction mixture into the self-propagating reactor, add an appropriate amount of Mg powder on the surface of the reactant as the igniter, heat the open flame in the air atmosphere to ignite the Mg powder, triggering the aluminothermic reduction reaction. At the same time, the electromagnetic stirring device is turned on, under the action of electromagnetic field stirring, the gold slag separation process is carried out to obtain a high-temperature copper-chromium alloy melt, and the circulating water is started for circulating water cooling, and the separated high-temperature alloy melt will be continuously cast into graphite In the casting mold, the preheating temperature of the ...

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Abstract

This invention relates to a method for preparing CuCr alloy contactor material by the thermit-magnetic casting method, which takes CuO Cr2O3 as the raw material, Al powder as the recovery agent and adds suitable CaF2 or Ni, Co elements to mix them evenly and put them into a self-spread reaction oven to initiate thermit recovery reaction and separate metal and slag stirred by the magnetic field to get high temperature CuCr alloy melt, which is quickly cooled by circulation water in a graphite die to get the CuCr ingot.

Description

technical field [0001] The invention belongs to the technical field of alloy material preparation, and in particular relates to a method for preparing a copper-chromium alloy contact material by an aluminothermic reduction-electromagnetic casting method. Background technique [0002] The contact material is the key factor determining the performance of the vacuum circuit breaker. The ideal contact material must have the following electrical properties: large breaking current capacity, high withstand voltage strength, reliable anti-welding performance, high conductivity and high Thermal conductivity, low arc burning rate and low cut-off value, etc. In recent years, with the development of high-power vacuum high-voltage switch technology, CuCr series alloy contact materials have gradually replaced the traditional W-Cu and Cu-Bi series alloy contact materials due to their many superior properties, and are widely used in In medium-high voltage and high-power vacuum switch circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C9/00H01H1/02H01H33/664
Inventor 张廷安豆志河赫冀成杨欢徐淑香
Owner NORTHEASTERN UNIV LIAONING
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