A method for preparing immiscible alloy ingots by thermite reduction-slag refining

An immiscible alloy and slag refining technology, applied in the field of metallurgy, can solve the problems of high inclusions in alloy ingots, large fluctuations in alloy composition, and many pore defects, and achieves removal of oxygen content, reduction of raw material costs, and simple operation. Effect

Active Publication Date: 2016-04-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Zhang Ting'an, Dou Zhihe, etc. proposed in the patent application number 200510047309.7 to use oxides as raw materials to prepare large-size homogeneous copper-chromium alloy contact materials by aluminothermic reduction-electromagnetic casting method, and realized the production of large-size copper-chromium alloy contact materials. However, there are quality problems such as high inclusions and many porosity defects in the prepared alloy ingot
Zhang Ting'an et al., based on the technology disclosed in the patent applications with application numbers 200710011613.5 and 200510047309.7, further proposed the use of electroslag remelting and refining to solve the problem of high inclusions and many pore defects in copper-chromium alloys prepared by the aluminothermic reduction-electromagnetic casting method. Quality problems, the preparation of homogeneous large-sized dense copper-chromium alloy ingots, but the shortcomings of large fluctuations in alloy composition have not been resolved, and the process is long and the operation is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Prepare three metal oxide powders respectively according to the composition of the immiscible alloy ingot to be prepared, the metal oxide powder is a Cu-based metal oxide powder consisting of CuO powder and PbO powder;

[0062] Mix each portion of metal oxide powder with Al powder, and then add CaO as a slagging agent, each portion of CaO accounts for 2%, 3% and 5% of the total weight of metal oxide powder and Al powder, and mix all the materials After uniformity, three parts of materials to be reduced are made;

[0063] The mixing proportions of CuO powder, PbO powder and Al powder are respectively 100:4.5:28, 100:320:60 and 100:775:105 by weight when mixing the ingredients for each part;

[0064] Put the materials to be reduced into the reactor respectively, and put Mg powder on the surface of the materials to be reduced, ignite the Mg powder directly with an open flame, trigger the thermite reduction reaction, and start the electromagnetic induction to carry out elec...

Embodiment 2

[0072] Prepare three parts of immiscible metal oxide powder according to the composition of the immiscible alloy ingot to be prepared, the metal oxide powder is Cu-based metal oxide powder, composed of CuO powder and CoO powder;

[0073] Mix each portion of metal oxide powder with Al powder, and then add CaO as a slagging agent, each portion of CaO accounts for 2%, 3% and 5% of the total weight of metal oxide powder and Al powder, and mix all the materials After uniformity, three parts of materials to be reduced are made;

[0074] The mixing proportions of CuO powder, CoO powder and Al powder are respectively 100:6:30, 100:150:90 and 100:350:175 by weight when mixing ingredients for each part;

[0075] Put the materials to be reduced into the reactor respectively, and put Mg powder on the surface of the materials to be reduced, ignite the Mg powder directly with an open flame, trigger the thermite reduction reaction, and start the electromagnetic induction to carry out electro...

Embodiment 3

[0083] Prepare three metal oxide powders according to the composition of the immiscible alloy ingot to be prepared. The metal oxide powder is Cu-based metal oxide powder, which is composed of CuO powder and Fe 2 o 3 powder composition;

[0084] Mix each part of the metal oxide powder with the Al powder, and then add the slagging agent CaO respectively, and each part of the CaO accounts for 2%, 3% and 5% of the total weight of the metal oxide powder and the Al powder, and mix all the materials Make three parts of materials to be reduced after uniformity;

[0085] CuO powder, Fe 2 o3 The mixing ratio of Al powder and Al powder is 100:5.5:30, 100:50:48 and 100:115:75 respectively by weight;

[0086] Put the materials to be reduced into the reactor respectively, and put Mg powder on the surface of the materials to be reduced, ignite the Mg powder directly with an open flame, trigger the thermite reduction reaction, and start the electromagnetic induction to carry out electromag...

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Abstract

The invention discloses a method for manufacturing an immiscible alloy ingot casting in an aluminothermic reduction-slag refining mode, and belongs to the technical field of metallurgy. The method comprises the following steps that (1) according to components of the immiscible alloy ingot casting to be manufactured, metallic oxide powder is prepared; (2) the metallic oxide powder and Al powder are mixed, and then slagging constituents are added; (3) a mixture of the slagging constituents and the powder is put into a reactor, Mg powder is put on a surface layer, under the electromagnetic field effect, open fire ignition is carried out, and a high-temperature melt body is obtained; (4) gold slag smelting is performed on the high-temperature melt body under the electromagnetic field effect, reduction smelting slag on the upper layer is discharged by 30 percent to 50 percent of the total weight, and the smelted high-temperature melt body is obtained; (5) premelting slag is added to carry out refining and impurity removing, meanwhile, deoxidizing agents are injected into the smelted high-temperature melt body, refining slag is removed, and a refining alloy melt body is obtained; (6) forced water cooling is carried out on the refining alloy melt body to be at the room temperature, and then slag removing and ingot extraction are performed. The method is easy to operate, low in requirement for technological conditions, low in cost and capable of rapidly manufacturing large-size immiscible alloy.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing immiscible alloy ingots through thermite reduction-slag refining. Background technique [0002] In recent years, with the development of high-power vacuum high-voltage switch technology, CuCr alloy has gradually replaced the traditional W-Cu and Cu-Bi series alloy contact materials due to its advantages of large breaking current capacity and high withstand voltage strength. Widely used in medium and high voltage high power vacuum switching circuits. With the development of ultra-high voltage power transmission, how to prepare homogeneous large-size CuCr alloy ingots has become the key to restrict the application of copper-chromium alloy materials. [0003] CuCr alloy belongs to monotectic alloy and cannot be prepared by ordinary melting method. Therefore, all countries in the world put the development of preparation process and technology of CuCr alloy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B5/04C22B9/10
CPCY02P10/25
Inventor 豆志河张廷安刘燕张子木王聪赵秋月吕国志牛丽萍赫冀成
Owner NORTHEASTERN UNIV LIAONING
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