A method for preparing tungsten-molybdenum-copper composite material by spark plasma sintering

Abstract

The invention discloses a method for preparing a tungsten-molybdenum-copper composite material through spark plasma sintering. The method comprises the steps that tungsten powder, molybdenum powder and copper powder are sufficiently ball-milled and evenly mixed at first, the evenly mixed powder is placed in a graphite mold, then the graphite mold is placed in a reaction chamber, and the tungsten-molybdenum-copper composite material is prepared at a low temperature through a specific thermal treatment process. The method for preparing the tungsten-molybdenum-copper composite material through spark plasma sintering is provided for solving the problems of an existing melting and infiltration method for preparing a tungsten-molybdenum-copper alloy; and compared with the existing melting and infiltration method, the method has the advantages that the preparation temperature can be lowered from 1100-1600 DEG C to 750-1050 DEG C, the preparation time is shortened from 100-760 min to 15-45 min, the tungsten-molybdenum-copper composite material can be prepared without a secondary thermal process that a tungsten-molybdenum framework is prepared before high-temperature copper infiltration, the process is simplified, the method is easy to implement, and products which are small in grain and tightly combined can be obtained. The defects that an existing sintering method is high in sintering temperature, long in sintering time, complex in process and the like are overcome.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of a tungsten-molybdenum-copper composite material sintered by discharge plasma. 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 Mo is us...

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Problems solved by technology

Compared with the existing infiltration method for preparing W-Mo-Cu composite materials, the spark plasma sintering method is applied to sintering and preparing W-Mo-Cu alloy, the preparation temperature can be reduced from 1100~1600°C to 750~1050°C, and the preparation time can also be controlled by 100~760min is shortened to 15~45min, the tungsten crystal grains are small and tightly bonded, and its power consumption is only 1 / 3~1 / 2 of the traditional sintering process, which solves the problems of high sintering temperature and long sintering time in the existing infiltration method. Disadvantages such as complex process

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