Preparation method for fast producing copper-chromium contact material

Abstract

The invention discloses a preparation method for fast producing a copper-chromium contact material. The method comprises the following specific steps that 1) powder mixing is performed, specifically,an adhesive agent is added into mixed powder of chromium powder and copper powder and mixed uniformly; 2) sieving and dispersing are performed, specifically, mixed powder obtained through treatment inthe first step is arranged in a container for dispersing and airing after being sieved by means of a sieving net; 3) presintering is performed, specifically, mixed powder obtained in the second stepis poured into a graphite die, and die pressing is performed under the pressure of 1-3.8 ton / cm2; 4) secondary sintering is performed, specifically, a porous sintering product obtained in the third step is continuously placed in a discharge plasma sintering furnace for vaccumizing and pressurizing; and 5) heat aftertreatment is performed, specifically, heat preservation is performed in vacuum or inert gas protection. According to the preparation method provided by the invention, the chromium powder and the copper powder are directly sintered after being mixed, and accordingly, the copper-chromium contact material is obtained; and compared with a copper-chromium contact material manufactured through the steps of powder mixing, isostatic cool pressing, vacuum bagging, heating and hot extrusion in the prior art, the preparation method provided by the invention involves effective simplifying of a preparation process, and the preparation process is completed without excessive equipment andcomplex technologies.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a preparation method for rapidly producing copper-chromium contact materials. Background technique [0002] Contact materials are widely used in automatic switches, large-capacity circuit breakers, molded case circuit breakers and other switches. The preparation method of the existing high-performance copper-chromium contact material usually includes the following steps: 1) raw material selection: select 50-300 micron electrolytic chromium powder or thermite reduced chromium powder and 300 micron electrolytic copper powder or atomized Copper powder; 2) Powder mixing: according to the weight ratio of Cu powder: Cr powder = 9:1 ~ 5:5, and ball milling according to the weight ratio of Cu powder and Cr powder: copper ball = 1:1 Mix the powder for 3-10 hours; 3) Cold isostatic pressing: Put the mixed powder into the rubber sleeve and cold isostatic press it into a bar, t...

AI Technical Summary

Problems solved by technology

It can be seen from the process of preparing the copper-chromium contact material that after the powder mixing is completed, the steps of cold isostatic pressing, vacuum sheathing, heating, and hot extrusion are required to obtain the copper-chromium contact material, and , each of the above-mentioned steps includes complicated procedures. Such a production process not only has a long cycle and consumes a lot of energy, but also requires a variety of equipment and high cost.