Method for preparing Mo-W-Cu alloy

Abstract

The invention belongs to the technical field of an alloy preparation method, in particular to a method for preparing Mo-W-Cu alloy, mainly aiming at overcoming the defects of low density, large alloy particle size, weak tensile strength and the like of the Mo-W-Cu alloy. The method for preparing the Mo-W-Cu alloy comprises the steps of: 1) mixing powder of raw materials: taking molybdenum powder,tungsten powder and copper powder according to a certain mass percent for ball milling, and preparing the raw material powder; 2) powder mechanical making: adding a stainless steel ball and ethanol into a ball milling tank, carrying out ball milling and preparing composite powder; 3) molding by pressing: putting the composite powder into a rubber bag sleeve, carrying out cold isostatic pressure pressing, and manufacturing a pressed green body; 4) sintering: putting the pressed green body into a sintering furnace, and preparing a Mo-W-Cu liquid-phase sintering body; and 5) hot extrusion: heating the Mo-W-Cu liquid-phase sintering body, carrying out hot extrusion deformation processing to prepare the Mo-W-Cu alloy. The method for preparing the Mo-W-Cu alloy has the advantages of being low in sintering temperature, fine in crystalline grains, ideal in organizational structure and high in material density.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation methods, and in particular relates to a method for preparing Mo-W-Cu alloys. Background technique [0002] Mo-Cu alloy has sufficient high-temperature strength, excellent high-temperature gas ablation resistance, arc corrosion resistance and thermal shock resistance, and can be used as high-temperature structural materials, electrical contact materials, EDM electrode materials, etc.; Mo-Cu The alloy also has a high thermal conductivity and a suitable thermal expansion coefficient, and can be used as a packaging material for high-power devices, such as semiconductor substrates, module substrates, high-performance engine parts materials and other heat sink materials; the Mo-Cu alloy and Composite with other metals, ceramics, etc., can also be made into gradient functional materials with excessively changing properties, which can be widely used in electric power, electronics, machinery, met...

AI Technical Summary

Problems solved by technology

The Mo-W-Cu alloy prepared by the mixed powder liquid phase sintering method is difficult to achieve high density and structure, and the density is only about 94-95%. People often increase the molding pressure and increase the sintering temperature to improve its density. , but increasing the molding pressure can increase the final density of the composite material, but it is only effective within a certain range, and the effect is limited; increasing the sintering temperature can also significantly increase the density, but the sintering conditions are harsh, and the grain size at high temperature Larger, the liquid copper overflows too much, and it is easy to cause uneven composition

Although the immersion method can obtain higher density, it is difficult to control the microstructure, the material performance is difficult to guarantee, and surface treatment is required

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