Nanocomposites Tungsten Carbide Prepared from Ammonium Paratungstate 2/2

2. Place the carbon nanotube in ammonium paratungstate (APT) solution, adding alcohol and monohydrate citric acid at the same time, stirring. The volume of alcohol and monohydrate citric acid added is account for 1% the volume of ammonium paratungstate solution with carbon nanotube. The properties of solubility and dispersion that solutes dissolute in the mixed solution were enhanced by carbon nanotube;

3. Adjusting pH and sol formed
Adding formic acid in the mixed solution, adjusted pH to value 1~3, and heated to 70~80℃, stirring at the speed of 20~30r/min, continuous stirring for 25~35 hours until the formation of sol;

4. Drying the sol in the vacuum environment, then gel formed
Placing the sol in a vacuum environment of 110~125℃ for 8~11 hours, and then gel obtained;

5. Making gel into powder, screening, and reduction in hydrogen
Making gel into powder, then screening, sieve pore of screen is 300 mesh; reducing powder screed in hydrogen of purity more than 99.99% and flow of 50~500ml/min, temperature of 500 to 800℃, and time for 1-10 hours, and then get nanocomposites tungsten carbide.

Nanocomposites tungsten carbide produced in this method that the distribution of carbon nanotube is uniform, and the average particle diameter is 20nm~ 80nm, more over tungsten cover on the outer surface of carbon nanotube. By adjusting the three variables in the preparation process like the hydrogen flow rate and the temperature and time of the hydrogen reduction, so it can be ensured to prepare nanocomposites tungsten carbide.

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