Аннотация:The technique of synthesis of specified composition nanocrystalline super refractory powders in ZrO2 – HfO2 – Y2O3 system was developed using sol–gel technology. Average crystallite sizes on the base of X-ray diffraction data were calculated. Microstructures were observed by SEM. Thermal behavior in the range 20-1200°C was investigated. The sintering of powders at relatively low-temperatures (1000-1400 °C, thermal treatment during 1-4 hours) were investigated that results in decreasing BET specific surface area from 155±5 m2/g to 7¸15 m2/g. This technique was applied to yield functional gradient composite material SiC/(ZrO2-HfO2-Y2O3) with near-surface layer consolidated by oxide refractory matrix, that confirmed by high-resolution computed tomography (p. 5264; fig. 11).