Preparation Method of Nano Tungsten Powder

A preparation method of nano tungsten powder comprises the following steps: (1) dissolving ammonium metatungstate, chromium nitrate and a water-soluble carbon source substance into in heated deionized water, electrically stirring to sufficiently mix raw materials, and after uniformly mixing the raw materials, performing spray drying to obtain precursor powder, wherein the weight percentage of the water-soluble carbon source substance is 10-30%, the weight percentage of the chromium nitrate is 0.5-2% and the temperature of the deionized water is 70 DEG C; and (2) putting the precursor powder obtained in the step (1) into a tubular atmosphere furnace, performing auxiliary hydrogen reduction, and before discharging the powder out of a furnace, passivating the powder with an inert gas, wherein the temperature is 710-850 DEG C, the heating rate is 10-15 DEG C/ min and the reaction time is 2-5h.

The particle size of the prepared tungsten carbide is 40-70nm; after the prepared tungsten carbide is crushed, agglomeration-free nano tungsten powder can be obtained; the environment is polluted; and the development of a nanocrystalline WC-Co hard alloy can be effectively promoted.




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