Nano violet tungsten oxide may be applied for producing thermal insulation film with high transparency and excellent thermal insulation properties. This kind of heat insulation film has gradually entered the public's field of vision as people's demand for heat-insulating and transparent film has increased.
The violet tungsten oxide can be prepared by APT hydrogen reduction method under wet hydrogen and high temperature conditions. Since the preparation of violet tungsten oxide needs to be carried out in a closed industrial rotary furnace, APT decomposes at a higher temperature to produce water vapor and NH3. The NH3 generated by the decomposition is introduced into the furnace, which is further decomposed to generate a large amount of H2 and N2. A wet hydrogen atmosphere is formed in the rotary kiln to reduce the powder. And it can be found that the feed rate, furnace tube speed and NH3 flow rate have a great influence on the performance of violet tungsten oxide.
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