METHOD OF MAKING WORKPIECES OF CERAMIC PRODUCTS Russian patent published in 2013 - IPC C04B35/486 C04B35/626 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to production of materials based on zirconium dioxide stabilised with yttrium oxide, and can be used in making composite ceramic articles used in electrical engineering, mechanical engineering, chemical industry, metallurgical industry and other industries. The method of making workpieces of ceramic articles involves producing zirconium dioxide stabilised with yttrium oxide by coprecipitation after mixing with constant stirring of zirconyl nitrate and yttrium acetate solutions and subsequent hydrothermal synthesis of oxides in a supercritical fluid reactor. Heat treatment is carried out by drying at temperature of 80°C for two hours and calcining in air at temperature of 500°C for 1.5 hours. The obtained nanopowder is granulated and workpieces are moulded, which are pre-sintered in air at temperature of 800-1000°C for 1 hour at heating rate of 5°C/min. After cooling in switched off furnace conditions, the workpieces undergo mechanical treatment and final sintering in air at temperature of 1200-1300°C for 5 hours.

EFFECT: method enables to make workpieces of ceramic articles with improved physical and mechanical properties: microhardness of at least 10000 MPa from weakly agglomerated high-purity nanopowder of zirconium dioxide stabilised with yttrium oxide.

1 ex, 4 dwg