Laser-induced thermal characterization of nano Ag metal dispersed ceramic alumina matrix

Abstract

In this paper, we report the measurements of thermal diffusivity of nano Ag metal dispersed ceramic alumina matrix sintered at different temperatures using laser induced non-destructive photoacoustic technique. Measurements of thermal diffusivity also have been carried out on specimens with various concentration of nano metal. Analysis of the data is done on the basis of one-dimensional model of Rosencwaig and Gersho. The present measurements on the thermal diffusivity of nano metal dispersed ceramic alumina shows that porosity has a great influence on the heat transport and the thermal diffusivity value. The present analysis also shows that the inclusion of nano metal into ceramic matrix increases its interconnectivity and hence the thermal diffusivity value. The present study on the samples sintered at different temperature shows that the porosity of the ceramics varies considerably with the change in sintering temperature. The results are interpreted in terms of phonon assisted heat transfer mechanism and the exclusion of pores with the increase in sintering temperature.

Thermal characterisation of dye-intercalated K-10 montmorillonite ceramics using photoacoustic technique

“…Thus, lattice connectivity is enhanced, the scattering centres are reduced and the mean free path is increased. This increase in mean free path of heat carrier results in an increased value for TD of the sintered samples [9,50]. Table 2) also show the same trend as the non-sintered ones [14].…”

“…But, it is observed that the TD of MB-5 is less than that of K-10. The higher TD of K-10 can be due to the enhanced lattice connectivity [9,49,50]. Here, also, we can see that the repeatedly adsorbed sample has a lesser TD than the single adsorbed sample, which may be due to the densely packed dye molecules, as in the case of the non-sintered samples.…”