METHOD OF MANUFACTURE OF THE STRONG CERAMICS Russian patent published in 2006 - IPC C04B35/48 C04B35/626 

FIELD: ceramic industry; metallurgy; method of production of the industrial ceramics and refractories.

SUBSTANCE: the invention is pertaining to the field of industrial ceramics and refractories and may be used for manufacture of the details working under the mechanical loadings. The technical result of the invention is creation of the strong ceramics containing zirconium dioxide with the structure having the various size of the grain resulting in the high viscosity of destruction. The invention presents the method of manufacture of the strong ceramics including molding of the billets out of the ultradispersible powder containing zirconium dioxide, sintering with the subsequent quenching. At that the sintering of the billets conduct in the vacuum with the residual pressure of no less than (2-3)·10^-5 mmHg with the isothermal aging in the temperature field of existence of the of zirconium dioxide cubical phase at 1750-1800°C within 2-12 hours. The heating speed up to the sintering temperature is changed a stage-by-stage: up to the temperature of 1200°C it makes 350-500° C per hour, and further up to the sintering temperature - 300-320°C/hour. For molding of the billets use the ultradispersible powder containing zirconium dioxide of not less than 20 mass % with the additives of the metals oxides from the group consisting of yttrium oxide, calcium oxide, magnesium oxide, ceric oxide and their mixtures and in addition - aluminum oxide.

EFFECT: the invention ensures creation of the strong ceramics containing zirconium dioxide with the structure having the various size of the grain resulting in the high viscosity of destruction.

5 cl, 1 tbl, 2 ex