The influence of tribophysical activation on solid-state reaction during thermal treatment of ZnO-Cr2O3

Tribophysical (mechanical) activation is used as a method for modification of physico-chemical properties of dispersed systems such as polycrystalline mixture of ZnO and Cr2O3 powders, obtained by conventional ceramic powder processing wet technique. Conventional mixtures were tribophysically activa ted by grinding in a vibro-mill with a continual regime in air. Conventiona l mixture and tribophysically activated mixtures, with activation times of 40 and 80 minutes, were thermally treated in non-isothermal and isothermal conditions. Solid-state reactions in non-isothermal conditions were examine d by X-ray diffraction, differential thermal analysis and dilatometric meas urements. The influences of tribophysical activation on solid-state reactio n between ZnO and Cr2O3, during thermal treatment in isothermal conditions were investigated by X-ray diffraction line broadening theory. As a Fourier method for the pure physical line profile analysis a double-Voigt method i s used. Mechanism of mass transport during solid-state reaction in ZnO-Cr2O 3 system is proposed.