METHOD OF MAKING ZIRCONIUM DIOXIDE-BASED CERAMIC ARTICLES Russian patent published in 2013 - IPC C04B35/486 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to making ceramic articles from material based on partially stabilised zirconium dioxide: ultra-sharp and wear-resistant high-strength cutting tools for surgery, traumatology, orthopaedics and prosthesis, non-wear friction pairs for bearings, grinding bodies, pistons for brake pads, dies, rollers, nozzles, springs etc, for operation at high temperatures and in aggressive media. According to the disclosed method, a starting crude mixture is prepared, the components of which are taken in the following ratios, wt %: yttrium and/or cerium oxide 0.35-15.50; modifier additive in form of a transition metal oxide - 0.20-3.50 and zirconium dioxide - the balance (up to 100). Particles of the mixture with size of up to 100 nm are then chemically deposited and dried to moisture content of 1-2%. Uniaxial, double-sided pressing is carried out while monitoring average density and shape of the workpiece. The pressed workpieces are dried for 7-8 hours at temperature of 200-250°C, processed with a diamond tool on outline drawings to provide the required shape, fired at temperature of 1450-1500°C, tempered using electrical and/or microwave sources of energy after 1.5-2.5 days and final processing, grinding and polishing of working surfaces is then carried out.

EFFECT: invention increases strength and wear-resistance of ceramic articles.

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