Blue tungsten oxide powder for infrared absorption material may be added to the tungsten powder, and then be sintered to obtain a tungsten skeleton. Some researchers have mixed blue tungsten oxide powder (the particle size of the three BTO samples is more and more smaller) of different particle sizes with a mass fraction of 10% and 2μm tungsten powder, and then sintered at 1400°C. The density of the skeleton after sintering was 50.54%, 58.26%, and 59.11%, respectively. As can be seen from the results, after reducing the particle size of blue tungsten oxide, the density of the skeleton can be improved at a lower temperature.
In addition, after the particle size of blue tungsten oxide is reduced, the alloy structure of the tungsten skeleton is better. Due to the reduced particle size of the blue tungsten oxide, the residual porosity during the reduction process is greatly reduced. The reduction of the pores facilitates sintering between the powders, making the pore distribution more gradual. In addition, the particle size of the small particle size blue tungsten oxide powder and the 2μm tungsten powder are more consistent, the powder mixing is more uniform, and the uniformity of the alloy structure of the skeleton and copper infiltration is improved.
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