CERAMIC MATERIAL AND METHOD FOR ITS OBTAINING Russian patent published in 2019 - IPC C04B35/486 C04B35/624 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of ceramic materials based on tetragonal zirconium and a method for its production. Material can be used for the manufacture of products for structural and medical purposes, mainly for the framework of all-ceramic restorations in dentistry. Ceramic material based on synthesized nanopowders with chemical composition, mol.%: ZrO₂ 96.0÷96.5, Yb₂O₃ 2.5÷3.3, Y₂O₃ 0.7÷1.0, contains solid solution Zr_1-n[YbY]_nO₂. Method of obtaining a ceramic material includes reverse sedimentation in the presence of isobutanol and 0.1 % aqueous solution of polyvinylpyrrolidone mixture of one-molar solutions of salts of zirconium oxychloride, nitrate of ytterbium and yttrium nitrate with ammonia solution, heat treatment at 750 °C, deagglomeration, compaction and sintering at a temperature of 1,450 °C. Properties of ceramic material: relative density of 99.2–99.8 %, strength at static bending 900–950 MPa, crack resistance 15–15.5 MPa·m^1/2, microhardness of 10 GPa and modulus of elasticity of 205 GPa.

EFFECT: ceramic material retains the values of the strength characteristics after exposure to factors that mimic a long stay in the biological environment (in vivo).

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