Blue tungsten oxide nano powder for thermal insulation thin film can be used to prepare ultrafine tungsten powder. As the reduction process conditions such as reduction temperature, loading amount and hydrogen flow rate determine the particle size of tungsten powder, some scholars have conducted research on the preparation of ultrafine tungsten powder by analyzing the effects of hydrogen reduction, reduction temperature, amount of loading and flow of hydrogen on the particle size of tungsten powder. The influence of hydrogen flow rate on the particle size of the obtained tungsten powder is mainly discussed below.
As hydrogen reduction process of blue tungsten oxide belongs to the gas-solid heterogeneous reaction type, when the reduction reaction is carried out at a low temperature, if the hydrogen flow rate is increased, the vapor pressure of water vapor in the atmosphere is lowered, and the water vapor generated by the reaction is more easily diffused outward, then the prepared tungsten powder has a reduced particle size.
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