Chapters authored
Sintering of the Tricalcium Phosphate-Titania-Magnesium Fluoride Composites
Titania (TiO2) and magnesium fluoride (MgF2) can be mixed with tricalcium phosphate (β‐Ca3(PO4)2, β‐TCP) to make bioceramic composites, which would combine the biocompatibility of the β‐TCP and the high tribological properties of TiO2 and MgF2 for biomedical applications. The samples were characterized by different characterization techniques such as physicochemical and mechanical. The sintering of the TCP at various temperatures (1000, 1100, 1200 and 1300°C) with different percentages of titania (2.5, 5, 7.5, 10, 20, 30, 40 and 50 wt%) was studied. The performances of the TCP‐TiO2 composites increase with both the sintering temperature and the amount of titania. The highest values of the composites’ (H = 270 Hv; E = 33.1 GPa and G = 15.7 GPa) were obtained with 40 wt% titania at 1200°C. Moreover, the addition of 4 wt% MgF2 to the TCP‐40 wt% TiO2 composites leads to better mechanical properties (σr = 27 MPa; H = 360 Hv; E = 51 GPa and G = 20 GPa) at 1200°C for 1 h. The amelioration of these properties is due to the formation of a new compound and the liquid phase which helps to fill the pores in the microstructure. The obtained performances of the TCP‐TiO2‐MgF2 composites are similar to those of bone tissue and especially as enamel.
Part of the book: Sintering of Functional Materials