Thermal diffusivity measurements in porous ceramics by photothermal methods

• DOI: 10.1007/s003390050534
• Publication Date: 2002-08-25T04:19:44Z
• Authors: A. Sánchez-Lavega; A. Salazar; A. Ocariz; L. Pottier; E. Gomez; L.M. Villar; E. Macho
• Keywords: 02 engineering and technology; 0210 nano-technology

We present a study of the use of photothermal methods to measure the thermal diffusivity of porous ceramic materials as an alternative to other conventional methods. Specifically, we discuss the use of three modulated techniques - thermoreflectance, IR radiometry, and the mirage effect - as complementary tools. Measurements of 'local' and 'global' thermal diffusivity are presented for a set of SiC samples of various porosities. In particular, the thermal diffusivity of three samples of SiC of different porosities is measured (by the mirage technique) as a function of temperature in the range from ambient to 1000 K.