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

Abstract

A method for preparing immiscible alloy ingots by aluminothermic reduction and slag refining, which belongs to the field of metallurgical technology and is carried out according to the following steps: (1) Prepare metal oxide powder according to the composition of the immiscible alloy ingots to be prepared; (2) Mix metal oxide powder and Al powder, add slagging agent; (3) Put it into the reactor, put Mg powder on the surface, and ignite it with an open flame under the action of electromagnetic field to obtain a high-temperature melt; (4) Put The high-temperature melt is smelted with gold slag under the action of the electromagnetic field, and 50~70% of the total weight of the reduced smelting slag in the upper layer is released to obtain the melted high-temperature melt; (5) Pre-melted slag is added for refining and impurity removal, and at the same time, the high-temperature smelting slag is added to the smelting slag. Blow the deoxidizer into the melt; remove the refining slag to obtain the refined alloy melt; (6) Force water to cool to room temperature, and then remove the slag and extract the ingot. The method of the invention is simple to operate, has low requirements on process conditions, and is a low-cost and rapid method for preparing large-size immiscible alloys.

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 ...

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