Method for reducing and preparing nano molybdenum-copper composite powder with low temperature

Abstract

A method for reducing and preparing nano molybdenum-copper composite powder with low temperature comprises two steps: step 1, preparing molybdenum-copper oxide precursor, and step 2, preparing nano molybdenum-copper composite powder. In step 1, a water solution of molybdenum salt and an ammonia water solution of copper salt are mixed, the mixed solution is heated through micro-wave heating for fast concentration, and resolvents are removed to obtain molybdenum-copper oxide precursor powder; and in step 2, molybdenum-copper oxide precursor powder is heated to be 325 to 400 DEG C, calcined, taken out of a stove, cooled by air, and then heated to 525 to 625 DEG C for reducing after being placed in an H2 atmosphere, so as to obtain nano molybdenum-copper composite powder. The nano molybdenum-copper composite powder prepared according to the method has the advantages that the specific surface area is large; the crystal grains are fine and the purity is high. As molybdenum-copper oxide precursor powder is prepared by combining a simple and effective liquid phase chemical method with micro-wave heating, and nano molybdenum-copper composite powder is prepared through calcining and reducing, the method provided by the invention is simple and fast; the process is easy to control; the powder yield is large; the efficiency is high; the reducing temperature of powder is greatly reduced; and suitability for industrialized mass production is realized.

Description

technical field [0001] The invention discloses a method for preparing nano-molybdenum-copper composite powder through low-temperature reduction, and belongs to the technical field of powder metallurgy preparation. Background technique [0002] Molybdenum-copper composite material is a pseudo-alloy, which combines the high melting point and high strength of molybdenum with the high plasticity and high conductivity of copper, and has good comprehensive properties. Molybdenum-copper materials were mainly used as electrical contacts of high-voltage switches in the past, and have been widely used in aerospace and weapon industries in recent years. [0003] Traditional molybdenum-copper materials are prepared by infiltration sintering and simple liquid phase sintering, but both have shortcomings such as composition segregation and low relative density, which seriously affect the advantages of molybdenum-copper materials. Using powder metallurgy to sinter nano-molybdenum-copper co...

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Problems solved by technology

However, there are corresponding shortcomings. The existing chemical methods include sol-gel method, atomization transformation method, chemical plating method, liquid phase reduction method, etc. These methods require high equipment or relatively complicated processes, and some of them require multi-stage reduction. The reduction temperature is generally 700~900°C, or the time is very long, so it is difficult to have a method with simple equipment, simple process and short time

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