THE APPLICATION OF THE THEORY OF THE DIFFUSIVE DECOMPOSITION TO THE PREDICTION OF THE THERMAL STABILITY OF SOFC MATERIALS

摘要

The physicochemical aspects of the thermal stability of materials have been examined basing on the general theory of the diffusive decomposition of multicomponent multiphase systems, conditioned by the diffusive interaction of macrodefects. The criteria for the dimensional and the phase stability of multicomponent systems in the process of the diffusive decomposition have been formulated. The peculiarities of the application of the theory to predict the evolution of multicomponent SOFC materials in the operating conditions of the high-temperature electrochemical generator have been analysed. The possibilities of using the numerical methods of simulation of destabilisation of SOFC materials are discussed, taking into account the complexity of the non-linear equations of the theory and the difficulties of obtaining of the analytical solutions to particular cases.