title: Sintering and mechanical properties of the alumina-tricalcium phosphate-titania composites.
abstract: The objective of this study was to determine the effect of the content of titania and the sintering process on the transformation phase, the densification, the rupture strength and the microstructures of the alumina-10 wt.% tricalcium phosphate composites. After the sintering process, the samples were examined by using (31)P and (27)Al magic angle scanning nuclear magnetic resonance, X-ray powder diffraction and scanning electron microscopy analysis. The Brazilian test was used to measure the rupture strength of the samples. The present results provide new information about solid-state reactivity in the ternary system α-alumina-β-tricalcium phosphate-anatase-titania. The differential thermal analysis of the α-alumina-β-tricalcium phosphate-titania composites shows two endothermic peaks, at 1360 °C and at 1405 °C, which are caused by the reactions between titania/alumina and titania/tricalcium phosphate, respectively. Thus, the presence of titania in the alumina-10 wt.% tricalcium phosphate leads to the formation of β-Al2TiO5 at 1360 °C. At 1600 °C, the alumina-10 wt.% tricalcium phosphate-5 wt.% titania composites displayed the highest rupture strength (74 MPa), compared to the alumina-10 wt.% tricalcium phosphate composites (13.5 MPa). Accordingly, the increase of the rupture strength is due to the formation of the new β-Al2TiO5 phase.
authors.affiliation: Laboratory of Industrial Chemistry, National School of Engineering, Box 1173, 3038 Sfax, Sfax University, Tunisia. Electronic address: sakka.siwar@yahoo.fr.
authors.forename: Siwar
authors.initials: S
authors.lastname: Sakka
authors.affiliation: Laboratory of Industrial Chemistry, National School of Engineering, Box 1173, 3038 Sfax, Sfax University, Tunisia.
authors.forename: Jamel
authors.initials: J
authors.lastname: Bouaziz
authors.affiliation: Laboratory of Industrial Chemistry, National School of Engineering, Box 1173, 3038 Sfax, Sfax University, Tunisia.
authors.forename: Foued
authors.initials: F
authors.lastname: Ben Ayed
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D002130:Calcium Phosphates; C009495:titanium dioxide; D014025:Titanium; C018392:tricalcium phosphate; D000537:Aluminum Oxide
keywords: Alumina; Biomaterials; Mechanical properties; Sintering; Titania; Tricalcium phosphate