Purple Tungsten Preparation Of Nano-Tungsten Powder Reduction

Compared with yellow tungsten or tungsten blue, purple tungsten have: an elongated needle or rod crystal, large surface area, high activity, good ventilation, oxygen index and small series of excellent properties, it is particularly suitable for gas-solid reactions The condition can easily be restored, and the grain is not easy to grow. Therefore, purple tungsten raw material, by lowering the reduction temperature, slow push the boat speed and reduce the amount of equipment and increased boat traffic, such as hydrogen can be produced optimal conditions of quality nano tungsten powders.

Purple tungsten during the restore process, the powder particle size changes all the time, this change mainly from two aspects. On the one hand is a chemical vapor transport growth mechanism. Tungsten oxide and water vapor will generate a volatile hydrated contact tungsten oxide (WO2 (OH2) and the H2 reduction reaction, the reduction product has been deposited on the nucleation of the metal tungsten powder, so that the grain growth; on the other hand is a solid-phase chemical reaction mechanism as the reduction of local time and reducing gas increasing concentration, purple tungsten reacts with hydrogen gas-solid multiphase reduction reaction. On purple tungsten needle or rod-shaped crystals breed countless tiny uniform spherical tungsten oxide grain, purple tungsten with the removal of oxygen atoms gradual lattice rearrangement, and finally gradually transformed into beaded metallic tungsten powder.

Purple tungsten large surface area, high activity, oxygen index is small, permeability, and is most suitable for the preparation of nanoscale tungsten powder materials. Purple tungsten using conventional hydrogen reduction process, reduction by optimizing process parameters, capable of producing high-quality nano-tungsten powder. The preparation process is short, high stability, and no atmospheric emissions of CO2 gases, is an environmentally friendly production methods.
 

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