METHOD OF PRODUCING NANOSTRUCTURED COMPOSITE CERAMICS BASED ON ZIRCONIUM, ALUMINUM AND SILICON OXIDES Russian patent published in 2019 - IPC C04B35/486 B82Y40/00 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to methods of producing high-strength materials, specifically composite ceramics based on stabilized zirconium dioxide and corundum with the addition of silicon dioxide. Invention can be used in production of strong and wear-resistant parts for various industries, including those operating under conditions of high temperatures and corrosive media (draw plates, drawing dies, bearings, rollers, grinding balls, pistons of brake discs, etc.), and products for medicine (cutting tools for surgery, implants for prosthetics, etc.). To obtain nanostructured composite ceramics based on oxides of zirconium, aluminum and silicon by mechanical method, mixing nanodispersed powders of synthetic zirconium dioxide (89.68–90.17 wt%), calcium oxide (2.84–2.85 wt%), corundum (4.87–4.9 wt%) and silicon dioxide (2.08–2.61 wt%). Obtained mixture is dispersed and homogenized in distilled water, grinding is performed in a planetary mill, the mixture is dried in a furnace at temperature of 80 °C. Sample is molded by uniaxial pressing at pressure of 500 MPa. Sintering is performed in two-step mode: first, at 1,300 °C, then reducing temperature to 1,200 °C and maintained for 4 hours.

EFFECT: obtaining composite ceramics with high ratio of hardness and fracture toughness.

1 cl, 2 dwg, 2 tbl, 2 ex