Abstract
In this text, the effective thermal conductivity of different shape filler particles was investigated. The thermal insulation coatings were prepared using hollow glass beads and sepiolite as thermal insulation fillers and the thermal insulation effect was evaluated. The results show that the optimum ratio of sepiolite and hollow glass beads is 6:1, and the temperature difference of upper box and lower box is up to 18 °C. The main reason for this phenomenon is that the thermal conduction chain is difficult to form in the direction of heat flow, thus leading to the increase of thermal resistance and decrease of thermal conductivity.
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