alexa Mechanical properties and bioactive surface modification via alkali-heat treatment of a porous Ti-18Nb-4Sn alloy for biomedical applications.

Author(s): Xiong J, Li Y, Wang X, Hodgson P, Wen C

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Abstract A porous Ti-18 at.\%Nb-4 at.\%Sn (hereafter, Ti-18Nb-4Sn) alloy was prepared by powder metallurgy. The porous structures were examined by scanning electron microscopy and the phase constituents were analysed by X-ray diffraction. Mechanical properties of the porous alloy were investigated using a compressive test. To enhance the bioactivity of the alloy surface, alkali-heat treatment was used to modify the surface. The bioactivity of the pre-treated alloy sample was investigated using a biomimetic process by soaking the sample into simulated body fluid (SBF). Results indicate that the elastic modulus and plateau stress of the porous Ti-18Nb-4Sn alloy decrease with decreasing relative density. The mechanical properties of the porous alloy can be tailored to match those of human bone. After soaking in SBF for 7 days, a hydroxyapatite layer formed on the surface of the pre-treated porous Ti-18Nb-4Sn alloy. The pre-treated porous Ti-18Nb-4Sn alloy therefore has the potential to be a bioactive implant material. This article was published in Acta Biomater and referenced in

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