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Method for self-spreading molten slag refounding CuCr alloy contact material

A technology of electroslag remelting and contact material, which is used in contacts, circuits, electrical switches, etc., can solve the problems of strict powder quality requirements, uncertain process parameters, and large fluctuations in oxygen content, so as to avoid macrosegregation. , reduce energy consumption, the effect of uniform composition

Active Publication Date: 2009-06-10
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for preparing CuCr alloy contact materials by self-propagating melting and casting-electroslag remelting. Many process parameters are uncertain; the density of the material is poor, the distribution of Cu and Cr in the alloy is not easy to be uniform, and the combination is not tight enough, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take CuO, Cr 2 o 3 And Al powder by mass ratio CuO:Cr 2 o 3 : The ratio of Al powder is 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 reaction furnace, add an appropriate amount of Mg powder on the surface of the reactants as an igniter to 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 temperature of the graphite mold is 600°C. After stirring for 7 minutes, the stirring was stopped, and ...

Embodiment 2

[0024] 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%, and at the same time, add 2% NaF to the raw material, mix the reactants evenly, and then put the reaction mixture into the reaction furnace. An appropriate amount of Mg powder is added to the surface layer as an ignition agent to 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 temperature of the graphite mold is 680°C. Continue to carry out electromagnetic stirring, and carry out circulating water ...

Embodiment 3

[0026] 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 Al powder is 40% excessive, and at the same time add 3% CaO to the raw material, mix the reactants evenly, and then put the reaction mixture into the reaction furnace. An appropriate amount of Mg powder is added as an igniter to 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 temperature of the graphite mold is 700°C. Continue to carry out electromagnetic stirring, and carry out circulating water cooling at the same time. After sti...

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Abstract

The present invention is self-spreading fusion casting-electroslag remelting process for preparing CuCr alloy as contact material, and belongs to the field of alloy material preparing technology. Consumable electrode rod of CuCr alloy is first obtained with the materials including CuO, Cr2O3 and Al powder as well as proper amount of CaF2 and other additive and through a self-spreading fusion casting process, and then re-smelted in an electroslag furnace to further eliminate impurities, with the melt being water cooled to solidify and to obtain the CuCr alloy ingot. The process of the present invention has low cost, low power consumption and simple operation, and can obtain CuCr alloy ingot with high purity, homogeneous components, high density and no macrosegregation.

Description

Technical field: [0001] The invention belongs to the technical field of alloy material preparation, and in particular relates to a new process for preparing CuCr alloy contact material by adopting a self-propagating melting casting-electroslag remelting method. Background technique: [0002] The ideal contact material must have the following electrical properties: large breaking current capacity, high withstand voltage strength, reliable anti-welding performance, high electrical conductivity and 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 circuits, it is expected that with the continuous improvement of its performance, its a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02H01H1/021
Inventor 张廷安豆志河牛丽萍赵秋月赫冀成蒋孝丽
Owner NORTHEASTERN UNIV LIAONING
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