Method for manufacturing copper-chromium alloy through laser additive manufacturing technology

Abstract

The invention provides a method for manufacturing a copper-chromium alloy through a laser additive manufacturing technology, and belongs to the field of metal materials. Comprehensive performance of aCu-Cr contact material is hopefully comprehensively improved through microstructure refinement and super-refinement of the Cu-Cr contact material, insulating strength of a vacuum arc extinguish chamber is improved, and particularly, dielectric breakdown strength and electric erosive resistance of the alloy are improved and a chopping current value of the alloy is decreased through refinement of Cr phases; and refinement of the Cr phases and uniform dispersed distribution of Cr in cooper are hard to achieve through traditional preparation technologies like fusion casting and a powder metallurgy method. According to the method, an entire block of Cu-Cr alloy material is prepared through the laser additive manufacturing technology, the Cr phases can be refined, comprehensive performance of the alloy is improved, parts of arbitrary complex shapes can be manufactured quickly and precisely, free manufacturing of the parts is achieved, the forming problem of a number of parts of complex shapes is solved, processing procedures are greatly decreased, and the processing cycle is shortened.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to a method for manufacturing copper-chromium alloys by using laser additive technology. Background technique [0002] In recent years, high-power circuit breaking technology is developing rapidly, among which vacuum switches used in medium-voltage circuits (5-38V) have become mainstream products. The working principle of the vacuum switch is to separate and close the moving contact and the static contact of the vacuum chamber through mechanical vibration, so as to realize the switching of the circuit. At the moment when the contacts are separated, due to the action of the strong electric field, an arc is ignited between the contacts, and the high temperature of the arc melts and evaporates the micro-area metal on the surface of the contacts to form a metal vapor flow until the density of the metal vapor is too small to maintain the arc. , the circuit is disconnected. Therefore, for va...

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Problems solved by technology

Although the production cost of the mixed melting casting method is low, the copper alloy produced by it has problems such as coarse grains, serious deflection, and high impurity content. In addition, due to the characteristics that Cu and Cr are difficult to dissolve in each other, it is difficult to produce high chromium content and chromium distribution. homogeneous CuCr alloy

The mechanical alloying method is to mix copper powder and chromium powder for pressing and sintering. Although the distribution of Cr can be improved to a certain extent, it is still difficult to obtain a fully dense CuCr alloy.

The results reported in the literature showed [Liu Jie, Zhou Zhiming, Tu Jian, Huang Can, Cai Linjiang, Huang Weijiu, Wang Yaping, Microstructure and properties of laser surface treated CuCr50 alloy, Surface Technology, 2016, 45(5): 169-174] , after further laser remelting treatment on the surface of Cu-Cr alloy can greatly reduce the size of Cr phase, improve the distribution of Cr in copper, and improve the hardness and wear resistance of CuCr alloy, which shows that CuCr alloy can be rapidly solidified by laser remelting The method to refine the Cr phase is feasible, but the laser surface remelting method reported in the literature can only be used for surface modification of Cu-Cr alloys, and cannot be used for the preparation of bulk Cu-Cr alloy materials.