Blue Tungsten Oxide
Tungsten oxide (W2O3) is a compound of tungsten and oxygen. It has beenreported (2006) as being grown as a thin film by atomic layer deposition at temperatures between 140-240 °C using W2(N(CH3)2)6 as a precursor. It is not referred to in major text books e.g. Some older literature refers to the compound W2O3 but as the atomic weight of tungsten was believed at the time to be 92, i.e approximately half the modern accepted value of 183.84 the compound actually being referred to was WO3.
Blue tungsten oxide is a finely divided blue-violet crystalline powder. It is produced by rotary calcining ammonium paratungstate at closely controlled temperatures in a reducing atmosphere. OSRAM produces two standard grades differing mainly in oxygen content. Blue tungsten oxide is used primarily for the production of tungsten metal powder and tungsten carbide.
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 parameters.
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 trioxide.
1. Chemical Formula: WO3-x
2. Shape and properties: Blue powder,keeping stable in the
atmospheric temperature
3. Physical properties: Products passing 60 mesh screen
Apparent density:2.3~2.8g/cm3
4. Chemical Properties:
Element |
% Max. |
Element |
% Max. |
Element |
% Max. |
Al |
0.0005 |
Co |
0.0005 |
Mn |
0.0005 |
As |
0.001 |
Cr |
0.0005 |
Mo |
0.002 |
Bi |
0.0001 |
Cu |
0.0005 |
Ni |
0.0005 |
Ca |
0.001 |
Fe |
0.001 |
P |
0.0007 |
Mg |
0.0005 |
K |
0.001 |
Pb |
0.0001 |
Cd |
0.0001 |
Na |
0.001 |
S |
0.0007 |
Sb |
0.0003 |
Si |
0.001 |
Sn |
0.0003 |
Ti |
0.0005 |
V |
0.0005 |
- |
- |
5.Packing: In iron drum lined with plastic bags or cloth bags of
100/200kgs net each.
Note: Other requirements shall be discussed in details.
If you have any interest in blue tungsten oxide, please feel free to contact us by email: sales@chinatungsten.com or by telephone: +86 592 5129696
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