Method for preparing nano-tungsten powder by using sulfuric acid precipitation-H2 breathable reduction process

Abstract

The invention belongs to the technical field of preparation of metal powder which belongs to a metal material, in particular to a method for preparing nano-tungsten powder by using a sulfuric acid precipitation-H2 breathable reduction process, which is suitable for large-scale industrial production of nano-tungsten powder. The method is characterized by comprising: performing a precipitation reaction under the common action of a separant and a dispersing agent by using diluted solution of ammonium tungstate and diluted aqueous solution of sulfuric acid to obtain nano particular tungstic acid precipitate, performing centrifugal separation at high speed, washing repeatedly, drying under vacuum, reducing in a continuous breathable H2 reduction furnace, and finally obtaining nano tungsten powder with an average particle size of less than or equal to 35 nano meters. The method has the advantages that: the cost is low; the production efficiency is high; the equipment is simple; the process is short; the investment is small; and continuous and automatic large-scale production can be realized easily.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation in metal materials, and in particular provides a sulfuric acid precipitation-H 2 The method for preparing nanoscale tungsten powder by a gas-permeable reduction process is suitable for large-scale industrial production of nanoscale tungsten powder. Background technique [0002] Metal tungsten powder is widely used to prepare pure tungsten products with high melting point, such as rocket nozzle, heavy armor piercing projectile, tungsten wire, tungsten rod, tungsten plate, tungsten foil, and various ultra-high temperature heat-resistant parts, etc. Tungsten and a certain amount of iron, nickel, silver, copper and other metals can be made into various series of high specific gravity alloys, cluster projectile parts, computer CPU heat pillow materials, semiconductor tube packaging materials, and aircraft tail weight materials. hammer, high-performance electrical contact materials, et...

AI Technical Summary

Problems solved by technology

These two types of methods are mainly typical processes for producing tungsten powder from ore raw materials. Their main feature is that they can produce tungsten powder with medium and fine particles (0.5-8 microns) in large quantities. The disadvantage is that the mesh of the filter bag used in the production is too coarse. Ammonium tungstate or tungsten trioxide particles are too coarse, so it is impossible to produce ultra-fine or nano-scale tungsten powder ≤0.3 microns

3. Ammonium tungstate tungsten trioxide reduction method, this method is actually the latter stage of the first two methods, and its raw material is still the medium and fine particle ammonium tungstate or tungsten trioxide powder obtained by the previous second type of process after H 2 The process of producing tungsten powder is reduced, so it is still impossible to produce nano-scale tungsten powder

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