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

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 ...

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