Crystal Research and Technology
Cryst. Res. Technol. 34 (1999) 881 - Abstract -

B. A. Marinkovic, Z. V. Zakula, T. Sreckovic, M. Tomasevic*, M. M. Ristic**

Center for Multidisciplinary Studies University of Belgrade, Joint Laboratory for Advanced Materials of SASA
*Institute of Technology of Nuclear and Other Row Mineral Materials
**Serbian Academy of Sciences and Arts, Joint Laboratory for Advanced Materials of SASA

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 activated by grinding in a vibro-mill with a continual regime in air. Conventional 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 examined by X-ray diffraction, differential thermal analysis and dilatometric measurements. The influences of tribophysical activation on solid-state reaction 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 is used. Mechanism of mass transport during solid-state reaction in ZnO-Cr2O3 system is proposed.

Keywords: ceramics, defects, heat treatment, microstructure, powder technology, X-ray techniques


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