Effect of Titania Additive on Structural and Mechanical Properties of Alumina{Fluorapatite Composites

Abstract

Abstract:

Mechanical properties of alumina-fluorapatite composites with different titania additive amounts (0, 0.5, 1, 1.4, 2, 3, 4 and 5 wt%) have been investigated between 1200 and 1600 °C. The optimum values of densification and mechanical properties of composites have been reached with 1.4 wt% of titania after the sintering process at 1500 °C for 1 h. Thus, the rupture strength of alumina-26.52 wt% Fap-1.4 wt% TiO₂ reaches 75 MPa. At higher temperature and beyond 1.4 wt% TiO₂, the densification and mechanical properties were hindered by the formation of both intergranular porosity and secondary phase. X-ray diffraction (XRD) analysis of alumina-Fap-TiO₂ composites shows the formation of aluminium titanate (Al₂O₃-TiO₂:Al₂TiO₅). The 27Al magic angle scanning nuclear magnetic resonance analysis of Al₂O₃-Fap-TiO₂composites reveals the presence of octahedral and pentahedral aluminium and novel environment relative to tetrahedral aluminium sites.

Key words: Sintering, Fluorapatite, Alumina, Titania, Composites, Biomedical applications

Awatef Guidara, Kamel Chaari, Jamel Bouaziz. Effect of Titania Additive on Structural and Mechanical Properties of Alumina{Fluorapatite Composites[J]. J. Mater. Sci. Technol., 2012, 28(12): 1130-1136.

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