SHS Method of Nano Tungsten Carbide Powder

The present invention provides a self-propagating high-temperature synthesis of nano-tungsten carbide powder method. Steps are as follows:

1) Preparation of mix briquettes per kg nano WO3 powders add 300 ~ 320gMg powder, 30 ~ 60g nano-carbon black, 10 ~ 100g alcohol-soluble phenolic resin, mix per kg join 250 ~ 300ml ethanol as milling media , the above four kinds of raw materials are mixed from 4 to 12 hours milling, the slurry after milling at a temperature of 80 ~ 110 ℃ drying 1-4 hours, and then pressed into a compact;

2) Self-propagating high-temperature synthesis of nanometer WC powder mixture briquettes placed in a reactor to 0.5 ~ 2.0L / min flow rate through the Ar gas 10 to 30 minutes, the exclusion of air in the reactor, the briquettes heated to 100 ~ 250 ℃, incubated for 10 to 40 minutes, removing air, water, and ethanol was adsorbed briquettes, when energized to ignite the mixture of tungsten materials, causing self-propagating reaction;

3) Removal of acid impurities, the MgO from the reaction mass is broken after the spread, the addition of excess 1 ~ 10mol / L of hydrochloric acid, and soaked for 1 to 4 hours to completely dissolve the impurities MgO and hydrochloric acid, and suction-filtered, washed with deionized water, then filtration, loop 3 to 5 times, with a solution of AgNO3 Cl- ions detected in the filtrate, to date no AgCl precipitate formed, and then in an oven at 80 ~ 110 ℃ after washing the material dried for 1 to 4 hours;

4) H2 processing the material for 40 to 100 minutes in a tube furnace in an atmosphere of H2 at 800 ~ 1100 ℃, can continue to make the carbide W2C into WC, and to eliminate the excess free carbon, single phase nanometer WC powder with an average particle diameter of less than 80nm, carbon content 6.16 ~ 6.25%, free carbon content of less than 0.1%.

SHS nano tungsten carbide powder method of the present invention provides advantages: WC nanoparticles obtained powder is dispersed well resolved nanometer WC powder reunion, and, technology, equipment is simple, suitable for ultra-fine grain Carbide production.




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