Tungsten Oxide Reduction Process Influence Tungsten Powder Particle Size

During tungsten oxide reduction process the size of tungsten powder particle is usually varies. At present, there are two main theories to explain tungsten powder particle size changing at the reduction process change.

First is growth mechanism by chemical vapor migration. Tungsten oxide in contact with steam, will generate produce a volatile hydrated tungsten oxide (WO2 (OH) 2), and evaporated to gaseous phase react with H2 occurring homogeneous gas reduction reaction. The reduction product is deposited on the nucleation of tungsten grain, so that tungsten powder particles grow. This process reaction rate is quick, and the reduction product forms will change significantly compared to the raw materials.

Second is solid-phase local chemical reaction mechanism. The solid tungsten oxide contacts with H2 gas causing gas- solid reaction. With oxygen atom removing the lattice will rearrangement. This process is slow reaction rate, and reduced product shape does not change.

In tungsten powder reduction process, the above two mechanisms exist simultaneously, what kind of mechanism play a role part depending on the temperature and moisture content of the atmosphere. 

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

• < Prev
• Next >