Method for preparing CuCr alloy ingot through aluminothermic reduction-slag refining

Abstract

The invention discloses a method for preparing a CuCr alloy ingot through aluminothermic reduction-slag refining, and belongs to the technical field of metallurgy. The method comprises the following steps: (1) CuO powder, Cr2O3 powder and Al powder are prepared to obtain a mixed material; a slag forming agent is added into the mixed material, and a product obtained from the last step is put in a reactor; metal magnesium powder is put on; the ignition is performed by using open fire under the effect of an electromagnetic field; and a high-temperature melt is obtained; (2) the alloy slag smelting separation is performed under the effect of the electromagnetic field; the reduction smelting slag is discharged 30-50% of the total quantity; and a smelting high-temperature melt is obtained; (3) premelting slag is added for refining and removing impurities under the effect of the electromagnetic field; deoxidizing agent and copper powder are injected in a bottom blowing and powder injecting manner; and refining slag is removed to obtain a refined alloy melt; and (4) the forced water cooling is performed until the refined alloy melt is cooled to the room temperature; the slag is removed; and the ingot is drawn. The method not only can prepare the copper-chrome alloy ingot with large size, homogeneity and compactness, but also can prepare copper-chrome alloys in such series as CuCr5-CuCr70; all operations are performed in the atmosphere, and are simple; and the requirements on process conditions are low.

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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