Abstract: The characteristics of thermal conductivity measurement apparatus for high temperature with different low thermal conductance were compared, and one of the reasons leading to low measurement accuracy was concluded, that is mainly caused by the poor temperature uniformity with whole heating method. According to these analyses, the partition heating method was proposed for improving temperature uniformity of the specimen surface. Three materials with different thermal conductivity were used to experiment and simulation calculation through the whole heating and district heating method respectively. The experiment results show that a limited even surface temperature area can be formed on the center of the specimen with the whole heating method, and the entire surface temperature can be reached to a better uniformed state with the partition heating method.

Key words: Surface temperature, Homogeneity, Thermal conductivity, Heating method