Influence of particle contact on the estimation of powder reaction kinetics of binary mixtures

To develop a quantitative representation of the interparticle reaction rate of binary powder, an investigation of several models has been undertaken, and their fit to experimental data for the Fe2O3-V2O5 system has been performed by the present authors, as well as for the Al2O3-CuO, Al2O3-ZnO, MgO-Al2O3, MgO-Fe2O3, and Fe2O3-ZnO systems published previously, A concentric spherical model proposed recently shows a quantitative correlation between the reaction rate and the number of contact points between particles in unidirectional diffusion and counterdiffusion systems, The model is consistent with experimental data for the above systems, It is potentially useful for reaction-rate analysis of a wide range of powder systems in which particle sizes and the mixing ratio are varied independently, This is an improvement over previous unreacted core analyses such as the Jander and Ginstling-Brounshtein models.