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

Paper ID Volume ID Publish Year Pages File Format Full-Text
1770 90 1968 6 PDF Available
Title
Mechanical properties and bioactive surface modification via alkali-heat treatment of a porous Ti–18Nb–4Sn alloy for biomedical applications
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.

Keywords
Titanium–niobium–tin alloy; Powder metallurgy; Mechanical properties; Alkali-heat treatment; Bioactivity
First Page Preview
Mechanical properties and bioactive surface modification via alkali-heat treatment of a porous Ti–18Nb–4Sn alloy for biomedical applications
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 4, Issue 6, November 2008, Pages 1963–1968
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering