Process using CuCr metal powder for preparing copper-chromium alloy electrical contact consumable electrode

Abstract

The invention discloses a process using CuCr metal powder for preparing a copper-chromium alloy electrical contact consumable electrode. The process comprises the following steps that S1, metal copperpowder and chromium powder are weighted in proportion, and are uniformly mixed; S2, the above mixed powder is subjected to isostatic cool pressing treatment in isostatic cool pressing equipment to bepressed into a bar; the bar is subjected to vacuum sintering treatment in a vacuum sintering furnace to form a sintered blank; the sintered blank is subjected to electric arc smelting treatment in anelectric arc smelting furnace to form a cast ingot; and thermal deformation is carried out on the cast ingot to form a new bar; and S3, the new bar obtained in the step S2 is subjected to annealing treatment, and then the new bar is connected into an electrode bar with a certain length by adopting electron beam welding; and finally, the electrode bar is placed in the electric arc smelting furnacefor consumable remelting. The process is reasonable in structural design, can remarkably reduce the content of gas in a smelted copper-chromium alloy material, and improves the use stability of the copper-chromium alloy contact material.

Description

technical field [0001] The invention relates to the technical field of alloy preparation, in particular to a process for preparing copper-chromium alloy electric contact consumable electrodes by using CuCr metal powder. Background technique [0002] Copper-chromium alloy electrical contact material is a functional material. The current commercial methods for preparing CuCr series electrical contacts by smelting include: vacuum induction melting and vacuum consumable arc melting process. Vacuum induction melting process to prepare CuCr series electrical contact materials is the process of generating induced current on the surface of the material under the action of the alternating magnetic field of the induction coil, thereby melting and solidifying the material. In the vacuum induction melting process, non-metallic contact materials are usually used The crucible smelts the material, so the molten metal material will react with the crucible to cause material pollution and non...

AI Technical Summary

Problems solved by technology

Vacuum induction melting process to prepare CuCr series electrical contact materials is the process of generating induced current on the surface of the material under the action of the alternating magnetic field of the induction coil, thereby melting and solidifying the material. In the vacuum induction melting process, non-metallic contact materials are usually used The crucible smelts the material, so the molten metal material will react with the crucible to cause material pollution and non-metallic inclusion defects; the raw material for preparing electrode rods required by the vacuum consumable arc melting process—metal chromium powder is metal Chromium ore is prepared by the aluminothermic method, and the impurity content is high, which will cause alumina inclusion particles in the metallographic structure after the first remelting, and the prepared copper-chromium alloy material has a high gas content. The inclusion of alumina particles will lead to the reduction of the compressive strength and breaking performance of the vacuum interrupter during use, threatening the stable operation of the power grid

There are obvious inclusions in the metallographic phase of the alloy material prepared by vacuum induction melting and vacuum consumable arc melting process, and the gas content of the material is high

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