Small Size Violet Tungsten Oxide Particle Influence Factors (2)

After the study found that factors which affecting the violet tungsten oxide particle sizes have material (APT) particle size and production process conditions. Production process conditions include reducing temperature, heating rate, water vapor and hydrogen pressure ratio, material thickness and reaction time.
Firstly, the influence factor is water vapor and hydrogen partial pressure ratio, which are water vapor and hydrogen partial pressure ratio increases and the size of products larger. This is mainly due to the formation of hydrogen gas to form a volatile humidity hydrous tungsten oxide, tungsten oxide which is easy to cover the finer particles, so that the particle size increases. Second, the impact factor is heating rate, after experiment found that to produce fine particles the heating speed should not too fast. When the reduction in a tube furnace, the heating rate depends on the furnace temperature gradient and push the boat speed, hence reducing the furnace temperature gradient and push the boat speed are conducive to obtain fine particles of violet tungsten oxide. Thirdly, the reduction temperature influence violet tungsten oxide particle size. When the temperature increase the particle is grouping up. At the same time the reducing time also impacts on violet tungsten particles, the greater the reduction reaction of the longer particle size. Finally, the thickness of the material layer, the material thickness is larger, the larger the particle size of the product.



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