<p>The properties of composite ceramic materials sintered from SiO₂–Al₂O₃–ZrO₂ nanopowders were studied. Prior to sintering, the powders were subjected to mechanical activation in a planetary ball mill using zirconia balls as grinding bodies. The activated powders were pressed under compacting pressures of 50, 100, 200, and 300 MPa. Consolidation was carried out in an atmospheric high-temperature furnace at 1700°C. The surface of the sintered bulk samples was examined using a scanning electron microscope. Elemental analysis made it possible to establish patterns in the distribution of chemical elements. All the studied samples revealed the presence of two phases — Al₆Si₂O₁₃ and ZrSiO₄. The sample porosity and its dependence on the applied pressure were established. The mechanical properties of the samples were studied using nanoindentation, including indentation hardness and elastic modulus. The bending strength limits of the studied samples were determined by scratch testing. The crack resistance of the samples was determined by the indentation method using the Marshall–Evans relationship. The effect of the ratio of the initial components and the applied compacting pressure on the physical and mechanical properties of the resulting composite ceramics was determined.</p>