Thermal conductivity measurements on xonotlite-type calcium silicate by the transient hot-strip method

Gaosheng Wei1), Xinxin Zhang2), and Fan Yu2) 1) Key Laboratory of the Ministry of Education of China of Condition Monitoring and Control for Power Plant Equipment, School of Energy and Power Engineering, North China Electric Power University, Beijing 102206, China 2) School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘 要：The experimental results of the thermal conductivities of xonotlite-type calcium silicate insulation materials were pre-sented at different temperatures and pressures. Two appropriative surroundings, i.e. an elevated temperature surrounding from ambi-ent temperature to 1450 K and a vacuum surrounding from atmosphere pressure to 10-3 Pa, were designed for the transient hot-strip （THS） method. The thermal conductivities of xonotlite-type calcium silicate with four densities from ambient temperature to 1000 K and 0.045 Pa to atmospheric pressure were measured. The results show that the thermal conductivity of xonotlite-type calcium sili-cate decreases apparently with the fall of density, and decreases apparently with the drop of pressure, and reaches the least value at about 100 Pa. The thermal conductivity of xonotlite-type calcium silicate increases almost linearly with T3, and increases more abundantly with low density than with high density. The thermal conductivity measurement uncertainty is estimated to be approxi-mately 3% at ambient temperature, and 6% at 800 K.

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