ESTIMATION OF THERMAL RESIDUAL STRESSES IN CHARACTERISTIC MICROSTRUCTURE ELEMENTS OF HETEROPHASE CERAMIC COMPOSITES

Abstract

The task of scientific research is to estimate the level of residual thermal stresses on the interfacial surfaces of multicomponent ceramic composite materials with a layered structure of the reinforcing phase. For this purpose, analytical methods are proposed that take into account the stereometric parameters of the microstructure, elastic modules and coefficients of thermal expansion of phases, the termination temperature of residual thermal stresses during cooling of the composite after sintering. Comparison of the obtained results for alloy SiC-TiB₂ with numerical solutions of other model problems shows that the developed algorithm well describes the real processes of formation of residual thermal microstresses in the studied composites. The application of the proposed calculation method makes it possible to quickly control the accuracy of measurement of residual thermal stresses, helps to establish the optimal structure, phase composition and technological parameters of the cooling mode after sintering in the development of new materials. Reduction of local thermal stresses will lead to improved strength, fracture toughness, wear resistance of the considered tool materials.