Measurement of Thermal Conductivity for Insulation Materials in High Temperature Based on Transient Hot-Plane Method

Acquiring the thermal conductivity in high temperature accurately has important implications for using insulation materials. In this paper, the principle of the measurement of the transient hot plane method is introduced. For rising the operating temperature, the plane heat source with film is changed to no film one. So the measurement errors caused by film can be eliminated. Because of the low thermal conductivity of insulation materials and that the sample should be heated up to a high temperature, the preheating time will be too long. In order to shorten the time of preheating sample before measuring, this text introduces an original preheating method called center preheating method which is verified by the numerical simulating result. After the experimental apparatus has been established, practical measurements about thermal conductivity and thermal diffusivity have been made with ceramic fiber material in environment temperature at 23.9∼746.9°C. These experiments demonstrate favorable reproducibility and accuracy under the established apparatus in high temperature environment.