KINETICS OF MULTILAYER GROWTH IN SOLID-STATE REACTIONS

摘要

A short introduction to the problem of the growth of intermediate phases with a narrow homogeneity range in binary or quasi-binary systems is presented. The intrinsic growth rate of each phase can be calculated from the layer growth kinetics measured on multiphase diffusion couples. The average value of the self-diffusion coefficient of the rate-determining species can be obtained from the intrinsic rate constant in the framework of the Wagner-Schmalzried theory of solid-state reactions. Some results for the Cr-C, Ti-B, Y_2O_3-Fe_2O_3 and Gd_2O_3-Fe_2O_3 systems are presented and discussed.