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The influence of grinding depth on the phase composition and microhardness of the near-surface layer of a ZrO2(5,4 wt.% Y2O3) - 30 wt.% Al2O3 composite ceramic was investigated under plane grinding conditions. Grinding was performed on an OSh-400 surface grinding machine using a 1A1 diamond wheel at a peripheral speed of 40 m/s and a longitudinal feed rate of 7.3 m/min. The grinding depth was varied within the range of 0.005–0.02 mm. Phase analysis was carried out by X-ray diffraction using CuKα radiation in the 2θ range of 24 – 36°, and quantitative phase evaluation was performed by the Rietveld refinement method. Microhardness was measured by the Vickers method under a load of 0.5 N. It was established that an increase in grinding depth leads to a gradual increase in the monoclinic zirconia content in the near-surface layer from 31 % in the polished state to 41 % at a grinding depth of 0.02 mm. At the minimum depth of 0.005 mm, no significant change in phase composition was detected within the experimental error. The increase in monoclinic phase content is accompanied by a decrease in microhardness from 15800 to 14400 MPa. The results demonstrate that grinding depth is a governing technological parameter controlling mechanically induced phase transformation and the associated changes in the local mechanical properties of zirconia–alumina composite ceramics.
zirconium dioxide, composite ceramic, plane grinding, grinding depth, phase composition, microhardness
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