Sintering and Mechanical Properties of Magnesium and Fluorine Co-Substituted Hydroxyapatites

Samia Nsar, Amel Hassine, Khaled Bouzouita

Laboratory of Industrial Chemistry, National School of Engineering, Sfax, Tunisia.

DOI: 10.4236/jbnb.2013.41001                

Abstract

Biological apatites contain several elements as traces. In this work, Magnesium and fluorine co-substituted hydroxyapatites with the general formula Ca₉Mg(PO₄)₆(OH)_2-yF_y, where y = 0, 0.5, 1, 1.5 and 2 were synthesized by the hydrothermal method. After calcination at 500℃, the samples were pressureless sintered between 950℃ and 1250℃. The substitution of F^- for OH^- had a strong influence on the densification behavior and mechanical properties of the materials. Below 1200℃, the density steeply decreased for y = 0.5 sample. XRD analysis revealed that compared to hydroxylfluorapatite containing no magnesium, the substituted hydroxyfluorapatites decomposed, and the nature of the decomposition products is tightly dependent on the fluorine content. The hardness, elastic modulus and fracture toughness of these materials were investigated by Vickers’s hardness testing. The highest values were 622 ± 4 GPa, 181 ± 1 GPa and 1.85 ± 0.06 MPa.m^1/2, respectively.

Keywords

Hydroxyapatite; Magnesium, Fluorine; Sintering; Mechanical Properties

Conflicts of Interest

The authors declare no conflicts of interest.

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