Blue tungsten oxide nanopowder for thermal insulation thin film is the most widely used raw material for preparing ultrafine tungsten powder. As the reduction process conditions, under the premise of stability of blue tungsten oxide, play a decisive role in the particle size of tungsten powder. Therefore, researchers have studied the effects of reduction temperature, loading capacity and hydrogen flow rate on the particle size of tungsten powder by hydrogen reduction to obtain ultrafine tungsten powder. The effect of loading capacity on the particle size of the reduced tungsten powder is mainly discussed below.
Loading capacity affects the particle size of the reduced tungsten powder. When the loading amount is large, the thickness of the material layer is increased, which is not conducive to the diffusion and escape of water vapor generated during the reduction. The chance of action of tungsten oxide and water vapor is greater, the powder becomes thick. From the results, the larger the loading amount, the thicker the material layer, and the coarser the particle size of tungsten powder produced. Therefore, in order to produce fine tungsten powder, loading capacity should be appropriately reduced if conditions permit.
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