Mechanical Characterization of Tricalcium Phosphate Ceramics Doped with Magnesium
In this work, the mechanical properties of magnesium doped tricalcium phosphate ceramics, considered a bioceramic for bone repair applications, were studied. Pure β-TCP and β-TCP doped with 2.25 mol% of Mg powders were synthesized through neutralization, freeze dried, uniaxially pressed and sintered at 1200°C/1h. The mechanical properties were evaluated through four points flexural and compression strength tests, fracture toughness and Young's Modulus. After the flexural strength test, the fracture's surface and their homogeneity were characterized by scanning electron microscopy. It was verified that Mg addition into β-TCP structure lead higher linear shrinkage, followed by higher residual stress, decreasing the mechanical properties compared to pure β-TCP ceramics. However, this behavior does not hinder the use of such bioceramics as bone substitutive materials, mainly in the sites that do not require high mechanical solicitations.
Sonia Mello Castanho, Wilson Acchar and Dachamir Hotza
R. Borges et al., "Mechanical Characterization of Tricalcium Phosphate Ceramics Doped with Magnesium", Materials Science Forum, Vols. 798-799, pp. 454-459, 2014