Method for preparing ultra-coarse tungsten powder through high-temperature liquid phase reduction of tungsten oxide

Abstract

The invention discloses a method for preparing ultra-coarse tungsten powder through high-temperature liquid phase reduction of tungsten oxide. The method comprises the steps that the tungsten oxide and tungsten powder are taken as raw materials, the particle size range of the tungsten oxide and the tungsten powder is 0.2-1.0 [mu]m, and the raw materials are evenly mixed according to a certain massratio and placed into a tubular furnace, wherein the content of the tungsten powder is 0wt%-10wt%; and argon is led to be used as protective gas, after the temperature is increased to the set reduction temperature, the temperature is maintained for 0-1 h, the argon is closed, pure hydrogen is led into the tubular furnace for reduction, the reduction temperature is 1420-1600 DEG C, the heat preservation time is 0.5-2.5 h, and thus the ultra-coarse tungsten powder is prepared. The technology is simple, the process is short, the method is suitable for mass production of the ultra-coarse tungstenpowder in a factory, the prepared tungsten powder is good in dispersity and uniform in particle size distribution, and the average particle size of the tungsten powder is 58-70 [mu]m.

Description

technical field [0001] The invention belongs to the field of powder making by metal powder metallurgy. Background technique [0002] Cemented carbide is commonly known as "the teeth of industry". Coarse-grained WC-Co cemented carbide is widely used in geological exploration, mining, oil drilling and other fields due to its special impact resistance and high hardness. Metal tungsten powder is an important raw material for the production of cemented carbide, pure tungsten and tungsten alloy products. Whether it is cemented carbide or other tungsten products, there are strict requirements on the average particle size and particle size distribution of tungsten powder in the production process. In the field of cemented carbide, the particle size and particle size distribution of tungsten powder directly affect the particle size and particle size distribution of the produced WC powder. Cemented carbide for different purposes has different requirements on the average particle siz...

AI Technical Summary

Problems solved by technology

Using this method, during the reduction process, the mixed gas of water vapor and hydrogen is sent to the reduction furnace, the reduction temperature is 900-1350 ° C, the reduction time is 3-50 hours, and the particle size of the coarse-crystalline tungsten powder obtained after the final reduction is 10-100 μm. Method When preparing ultra-coarse tungsten powder with Fsss particle size of 100 μm, the raw material used is ultra-coarse tungsten powder with Fsss particle size of 30 μm, the reduction temperature is 1350 ° C, and the reduction time is 50 hours. This method has long reduction time, low actual production efficiency, and high requirements for equipment.

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