V. I. Pudov, Yu. I. Komolikov

PROSPECTS FOR IMPROVING THE MECHANICAL PROPERTIES OF AN ALUMINUM-ZIRCONIUM COMPOSITE BY ADDING ULTRAFINE Al₂O₃ POWDER SYNTHESIZED BY NITRATE COMBUSTION

The paper presents the results of studying the mechanisms of sintering and properties of an Al₂O₃–ZrO₂ composite doped with ultrafine Al₂O₃ powder (UFP) synthesized by burning nitrates. The material is sintered at temperatures ranging between 1450 and 1550 °C with the analysis of its physical and mechanical properties. It is shown that, as the sintering temperature and Al2O3 UFP concentration increase, linear shrinkage, microhardness, and strength naturally grow (the maximum values at 1550 ℃ are 27.8%, 19 GPa, and 357 MPa, respectively). The introduction of the Al₂O₃ UFP into the composite makes it possible to achieve an apparent density of 4.20 g/cm³ even at a sintering temperature of 1550 ℃.

Acknowledgment: The work was performed under a state assignment from the Russian Ministry of Science and Higher Education, theme Diagnostics, No 122021000030-1.

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