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|CAS Number:||1314-35-8||Molecular Formula:||WO2.9|
High Purity Blue Tungsten Oxide Powder with formula WO2.9 for making Tungsten Powder
Blue Tungsten Oxide (BTO)
Physical & Chemical Properties
Finely divided blue-violet crystalline powder
It is produced by rotary calcining ammonium paratungstate at closely controlled
temperatures in a reducing atmosphere.
Blue tungsten oxide is used primarily for the production of tungsten metal powder and
Blue tungsten oxide (BTO) is also called tungsten blue oxide (TBO). TBO is
manufactured by calcination of APT under more or less reducing conditions which vary
from producer to producer. It is not a chemically defined compound, but consists of
various different constituents, like trioxide, tungsten bronzes and different lower tungsten
oxides. The relative amount of these compounds in TBO depends on the calcination
TBO is the most important precursor in the line from oxide to W and WC powder. The
colour varies between deep dark blue to blue, faint blue and green blue. Also the TBO
particles are pseudomorphous to the original APT crystals, as described for tungsten
Blue tungsten oxide is a kind of dark blue compound containing tungsten (VI) and tungsten (V) mixed valence state, the appearance is dark blue powder, which is usually formed in the solution.
Blue tungsten oxide is the product of the action of reducing agent and tungsten compound, which is usually called blue tungsten. The composition of blue tungsten is very complex, and there are also intermediate oxides such as WO2, W4 and so on. If the blue tungsten composition of WO is to calculate the tungsten content of 82.13%, while in WO tungsten content is 79.30%, that is to say, the content of blue tungsten oxide tungsten trioxide is greater than. According to the requirements of the blue tungsten oxide product standard, the purity of the product is 99.95%, and the tungsten content should be 80.00%~80.80%.
Blue tungsten oxide (TBO) is one of the most important raw material for the manufacture of tungsten powder, due to the reduction of tungsten powder from blue tungsten oxide is easy to control the particle size and composition, in favor of other doped tungsten powder reduction process, so BTO is gradually replaced as the production of special tungsten trioxide tungsten material tungsten powder material. There are three main methods for the preparation of blue tungsten oxide: APT closed calcination, APT hydrogen reduction and internal reduction. At present, the first two methods are widely used in China's industry.
Drum, double lined plastic bags, net weight: 100kgs.
|Appearance||Blue Powder||Blue Powder|
|Purity of WO2.9(%,Min)||99.9||99.95|
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