Tungsten powder with tungsten oxide as raw materials, in four or more tube muffle furnace tube furnace with hydrogen reduction, grain size from 0.6 to 30 microns.Coarse, medium and fine granularity of several main points, silver powder, impurity content based on the national standard.

By hydrogen reduction of tungsten trioxide or secondary ammonium tungstate method. By hydrogen reduction of tungsten powder process generally divided into two stages: the first stage in temperatures of 500 ~ 700 oc, tungsten trioxide reduction of tungsten oxide; The second phase in temperatures of 700 ~ 900 oc, tungsten oxide reduction of tungsten powder. Reduction reaction in tubular furnace or rotary furnace.

Reduction of tungsten powder properties (such as purity, particle size, particle size composition, etc.) mainly depends on the reduction process. Reduction in the tube furnace tungsten powder, the main process parameters affecting the reduction rate is the tungsten oxide reduction temperature, burning the boat loading capacity, burning speed boat, hydrogen flow rate and moisture content in the hydrogen. With the increase of reduction temperature, the granularity of tungsten powder.

Tungsten powder for making except hydrogen reduction method, and early use of tungsten oxide carbon reduction method,the reduction temperature higher than 1050 oc. Use this method to get the low purity of tungsten powder. In addition, the metal aluminum, calcium, zinc and so on reduction of tungsten oxide process research work is in progress. For special applications requiring high purity and ultrafine particle size oftungsten powder, the development of the tungsten hydrogen chloride reduction method, the granularity of tungsten powder can be less than 0.05 microns.

Tungsten powder in the near future price trend analysis

Since the early stage of the downstream customers receive a degree is not high, so powder metallurgy factory pricing suspended, tungsten concentration, APT now has a rapid speed rises and, under cost powder manufacturer also need pricing, with a firm itself pretty price will stronger, so every day now prices are up slightly, export prices have to rise.

Powder market there is no obvious change. On-demand procurement market inquiry, powder enterprises, manufacturing-according-to-sale patterns remain low, as for the price of the holiday expectations, powder to the back-end enterprise market confidence is insufficient, relatively cautious. Powder enterprises are greatly influenced by the cost, the late rise in raw material market, powder market price can also follow up, but to rose by a big breakthrough.

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