A method for preparing tungsten-molybdenum-copper composite material by high-current resistance sintering

Abstract

The invention discloses a method of preparing a tungsten-molybdenum-copper composite material by large current resistance sintering. The method of preparing the tungsten-molybdenum-copper composite material by the large current resistance sintering comprises the following steps that firstly, tungsten powder, molybdenum powder and copper powder are ball-milled to be fully and evenly mixed, and thenmixed powder is put into a mould to be pressed into a blank of a cylindrical structure, the blank is put into a reaction chamber, and the tungsten-molybdenum-copper composite material is prepared ata lower temperature by a specific heat treatment process. As the method of preparing the tungsten-molybdenum-copper composite material by the large current resistance sintering aims at the problem ofpreparing tungsten-molybdenum-copper alloy by an existing infiltration method, compared with the existing infiltration method, the method can reduce the preparation temperature from 1100-1600EG C to 700-1000 DEG C, and the preparation time is shortened from 100-760 min to 4-27 min; the process of densification can be completed by the direct action of an electric field to a blank body to heat the blank body rapidly; and the process is simplified, the implement is easy, and the products with small grains and compact combination can be obtained. The disadvantages of existing sintering methods such as high sintering temperature, long sintering time, and complicated process are solved.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of sintering tungsten-molybdenum-copper composite material with large current resistance. Background technique [0002] Both W-Cu and Mo-Cu alloys are composite materials composed of two-phase mixed structures that neither solid solution with each other nor form intermetallic compounds. W-Cu has the characteristics of good arc erosion resistance, welding resistance, high strength and high hardness, and is widely used in electronics, military equipment, aerospace and other new technology fields. Although Mo-Cu can largely However, its high temperature strength and ablation resistance are still not competent in high temperature and harsh environments, so it can only be used in some occasions with low operating temperature, such as air rudders, counterweights, connecting plates, etc. Therefore, on the basis of W-Cu alloy, some...

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Problems solved by technology

Compared with the preparation of tungsten-molybdenum-copper composite materials by the existing infiltration method, the high-current resistance sintering method is applied to sintering to prepare W-Mo-Cu alloy, the preparation temperature can be reduced from 1100~1600℃ to 700~1000℃, and the preparation time is also shorter. It can be shortened from 100 to 760 minutes to 4 to 27 minutes. The tungsten and molybdenum grains are small and closely combined, and the power consumption is only 1 / 4 to 1 / 3 of the traditional sintering process, which solves the problems of high sintering temperature and sintering in the existing infiltration method. Disadvantages such as long time and complicated process

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