Study of the mechanical properties of a ceramics of orthopedic and dental use

The study of the preparation of ceramics is consisted in sintering a hardened cement, wich is composed of mixture of three calcium phosphates : tetracalcium phosphate (Ca$_{4}$(PO$_{4})_{2}$O), $\alpha $-tricalcium phosphate ($\alpha $-Ca$_{3}$(PO$_{4})_{2})$ and monocalcium phosphate (Ca(H$_{2}$PO$_{4})_{2}$.H$_{2}$O). After wetting, the cement evolved towards an apatitic phase while hardening. To check the effect of certain factors on the resulting ceramics, a complete central composite design of four variables (liquid/solid ratio, stoichiometric coefficient of monocalcium phosphate, rate of increase in temperature and duration of landing of termpertaure) was set up. The equation of the model and optimal conditions were defined