Densification and Strengthening of Tricalcium Phosphate/Titania Composite by Hot Pressing
Tricalcium phosphate [TCP, β-Ca3(PO4)2]/titania composite having high mechanical properties was prepared and characterized. The TiO2 and HAp powders, as starting materials, were synthesized by precipitation and hydrothermal methods, respectively. The sintered β-TCP/TiO2 composite was prepared by hot pressing at 1000°C for 30 min under the pressure of 30 MPa in N2 atmosphere or by pressureless sintering at 1200°C for 2 h in air with moisture protection. The influence of sintering condition on the microstructures and mechanical properties of the composite was investigated. During the sintering process, hydroxyapatite used as a starting material was decomposed to β-TCP and CaTiO3 at elevated temperature because TiO2 could accelerate the decomposition of hydroxyapatite. The hot-pressed composite with 98% of sintered density showed high hardnessvalue of 1080 Hv compared with the pure hydroxyapatite (600 Hv).
T. Ohji, T. Sekino and K. Niihara
J. K. Lee et al., "Densification and Strengthening of Tricalcium Phosphate/Titania Composite by Hot Pressing", Key Engineering Materials, Vols. 317-318, pp. 101-104, 2006