COMBUSTION SYNTHESIS AND STRUCTURE FORMATION IN A MODEL CR-CRO3 SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS SYSTEM

The combustion synthesis (self-propagating high-temperature synthesis, SHS) of a model Cr-CrO3 system is studied both experimentally and the oretically. The system is chemically simple, i.e. it is composed of on ly two elements, and convenient for combustion and phase formation stu dies. A new combustion model for a ''metal-metal oxide'' system and a mathematical model of phase and structure formation are developed. A n umber of dependencies are determined in the experiments and are descri bed in the combustion model. It is shown that the leading combustion s tage is the gas phase oxidation reaction. Different types of microstru ctures formed from homogeneous melt are revealed. A qualitative agreem ent between experimental data, theoretical analysis and calculation re sults is obtained.