Blue tungsten oxide nanopowder may not only be applied for producing infrared absorption material, but be added to the sintered tungsten skeleton, so that the density of the subsequent alloy is increased. The researchers found that the structure did not have significant pore residue after addition of blue tungsten oxide on tungsten skeleton and copper infiltration. They analyzed the relevant reasons and found that there are three main points:
1.0 Tungsten powder in the skeleton cannot form a necking very well. During copper infiltration process, the tungsten particles are separated due to the scouring of the copper liquid, so that there are many small particles in the skeleton, which causes the skeleton to clog and increase the infiltration dynamics. It is not conducive to the copper infiltration process.
2.0 Although the density of the sintered skeleton added with blue tungsten oxide is low, tungsten powder has a certain necking due to the activation of oxidation-reduction, and the bonding strength between tungsten powders is improved, which is beneficial to the retention of the skeleton structure.
3.0 Tungsten powder mixing with blue tungsten oxide powder is added to the skeleton, which is more fully reduced due to the oxidation-reduction process. And the skeleton impurities are less, which is beneficial to copper infiltration.
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