Thermoradiation characteristics of refractory oxides upon heating by concentrated laser radiation

Resumo

The results of experimental investigations and numerical calculations of thermoradiation characteristics of refractory oxides in a wide range of weak absorption (from 0.5 to 5.4 μm), obtained over more than 20 years of research, are analyzed and generalized. Experimental data have been obtained for ceramics made of magnesium oxide, cubic zirconia stabilized by calcium and yttrium oxides, and aluminum oxide. The experiments performed have shown that the temperature distributions in the reflecting and emitting layers must be taken into account when studying thermoradiation and optical properties upon heating by laser radiation up to the intense-evaporation temperatures and that it is important to take into account the influence of the heating radiation flux rate and the possible influence of scattering from condensate droplets formed in the surrounding air.