A method for preparing cucr alloy ingot by aluminothermic reduction-slag refining

Abstract

an aluminothermic reduction - The method for preparing CuCr alloy ingot by slag refining belongs to the field of metallurgy technology, and is carried out according to the following steps: (1) CuO powder, Cr2O3 powder and Al powder are made into a mixed material; a slagging agent is added, put into a reactor, and Put metal magnesium powder on it, and ignite it with an open flame under the action of an electromagnetic field to obtain a high-temperature melt; (2) Carry out smelting and separation of gold slag under the action of an electromagnetic field, and release 50-70% of the total amount of reduced smelting slag to obtain a smelting high-temperature melt ; (3) Add pre-melted slag, refine and remove impurities under the action of electromagnetic field, and at the same time adopt the method of bottom blowing and powder spraying, spray deoxidizer and copper powder; remove refining slag, and obtain refined alloy melt; (4) Forced water cooling , until the refined alloy melt is cooled to room temperature, the slag is removed and the ingot is pumped. The method of the present invention can not only prepare large-sized homogeneous and dense copper-chromium alloy ingots, but also CuCr5~CuCr70 and other series of copper-chromium alloys, all operations are carried out in the atmosphere, the operation is simple, and the process conditions Low requirements.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing CuCr 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 immiscible monotectic alloy, and CuCr alloy cannot be prepared by common smelting method. Therefore, all countries in the world put the development of CuCr alloy preparation process an...

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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 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

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