Abstract
The paper discusses the possibility of implementing two strengthening mechanisms in a ceramic system of Al2O3 and ZrO2 simultaneously: namely, transformational, due to the tetragonal form of zirconium dioxide and dispersion, due to the in situ formation of hexaaluminates of alkaline earth elements. The concentrations of modifying additives of calcium, strontium and barium, providing the formation of the corresponding hexaaluminates, have been established. The influence of the formed phases on the microstructure and strength characteristics of the obtained composites is considered. On composites including strontium cations, high strength parameters were obtained, flexural strength — 700 MPa, the critical stress intensity coefficient K1c reaches 10 MPa·m1/2, which is due to the optimal effect of a combination of transformation and dispersion hardening effects.
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