Specific Surface Area of Blue Tungsten Oxide

The specific surface area of tungsten oxide is the total surface area per unit mass tungsten oxide powder. It is commonly expressed by m²/g. It indirectly reflects the particle size and particle morphology of tungsten oxide powder, and it is an important index to measure the reaction ability of tungsten oxide powder with gas solid material during the reduction process.

The large specific surface area of tungsten oxide means that the reduction process has better kinetic conditions. When hydrogen is reduced, it is conducive to the infiltration of hydrogen and the escape of water vapor. When preparing tungsten powder, tungsten oxide is also required to have larger surface area and more cracks to facilitate doping. At the same time due to high surface chemical activity of tungsten oxide area is high, the reduction rate, so it can accelerate the speed and increase the amount of us shipping, so as to improve the production efficiency of tungsten powder.

In contrast to yellow tungsten oxide, the blue oxide has a larger specific surface area, making it easier to fabricate ultrafine tungsten powders and doped tungsten powders. The broadly defined blue tungsten oxide contains WO_2.90 and WO_2.72, and in general, Blue tungsten refers to WO_2.90, the current tungsten powder, tungsten carbide powder technology is toward the ultra-fine (nano), super-roughened, ultra-purified, centralized direction. The large specific surface area of blue tungsten oxide has gradually replaced yellow tungsten oxide as the mainstream.

Blue tungsten surface area of the main control parameters in the reduction in the realization of production method is the routine of APT in machine, through the spiral 200kg/h feeder speed into the vacuum rotary furnace (0.5-0.8) * 104Pa, under the protection of nitrogen gas, through rotary furnace, cooling and sieving, can have a specific surface area of blue tungsten 12.35m²/g.

This one, with multiple temperature preparation system preparation control zone, dynamic conditions by improving the process of blue tungsten tungsten powder reduction, improve production efficiency, improve the performance of this method is not only doped blue tungsten, and also conducive to the production of ultrafine tungsten powder and tungsten carbide powder.

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