Dark blue nano tungsten oxide for thermal insulating glass material can be added to the sintered tungsten skeleton for improving the thermal conductivity of the obtained alloy material. This is because when the sintered skeleton is added with blue tungsten oxide powder, the reduction of the interface energy and the water vapor generated during the process can ensure the smooth formation of the bore diameter, and thus build a complete continuous copper network, which can improve the thermal conductivity.
However, the researchers found that if the tungsten powder was directly added to the sintered tungsten skeleton, there was no significant improvement in the thermal conductivity of the material. This is because when the tungsten skeleton is sintered by the fine tungsten powder, the tungsten particles are separated by the flushing of the copper liquid during the infiltration, indicating that the tungsten powder cannot be sintered well at the above temperature. At the same time, the presence of fine tungsten powder causes blockage of the skeleton, which is not conducive to the infiltration process, resulting in insufficient copper infiltration, blocking the integrity of copper grid, thereby affecting the thermal conductivity of material.
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