MODELING THE THERMAL-CONDUCTIVITY OF MULLITE CORDIERITE COMPOSITES

The thermal conductivity (kappa) has been measured for a series of mul lite/cordierite composites in the temperature range 20 to 300 K. The K lemens-Callaway model, which is used to describe the temperature depen dence of kappa for crystalline materials, has been applied to the expe rimental results. This model incorporates three phonon-scattering term s, that include the effect of impurities, grain boundaries and phonons . The compositional dependence shows the characteristic form indicatin g the possibility of the formation of solid solutions.