Abstract
Particulate composite in the Al2O3-ZrO2-WC carbide system shows promising properties in structural applications especially as wear resistant parts. Mentioned materials show the unique microstructure of sintered bodies composed of three continuous polycrystalline subsystems mutually penetrating each other. Despite of mechanical properties of constituent phases, its properties depends on the residual stress state and the microstructure. Especially important is the interphase grain boundaries state. Significant differences of thermal properties of constituent phases create during composite manufacturing meaningful residual stresses (locally exceeded 1.5 MPa). It can influence the interphase boundaries structure. The Paper presents results of investigation of high-resolution transmission electron microscopy (HREM) on the different type grain boundaries structure and its chemical composition.