Evaluation of thermal conductivity of insulation materials at high-temperature for longtime

In order to research the effect of endothermic and exothermic processes on thermal parameters of the insulation materials under high temperature and long time, the high-temperature thermal conductivity measuring of two thermal insulation materials has been investigated by plane source-stepwise transient method in this paper. The thermal conductivity, diffusivity and capacity values of two materials at high-temperature for longtime have been obtained. The results showed that, insulation materials might also be accompanied by endothermic and exothermic processes under high-temperature and long-term, and heat insulation performance of the material will change. These processes could be responded by thermal conductivity measuring.