Abstract
Hydroxyapatite (HA) is a bioactive ceramic material with poor mechanical properties which hinders its application in bone implant. However, HA has a similar structure to bone and can promote the growth of natural tissues. Combining the low modulus β-type Titanium (Ti) based alloy (e.g:Ti-40Nb) which has excellent mechanical properties and non-toxic composition with HA is considered as a good candidate to expand its biomedical applications. In this current work, Ti, Ti-40Nb and Ti-40Nb-15HA (wt.%) was compacted under 500 MPa using powder metallurgy process. The mixtures were performed by high energy milling and sintering in a tube furnace with temperature of 1200°C/2 h under argon flow. The aim of this research is to investigate the morphology and the mechanical properties of metal alloys. Images obtained by SEM show a homogeneous morphology of voids with smooth surface for Ti and Ti-40Nb while Ti-40Nb-15HA show the presence of pores located at grain boundary and exhibit rough surface appearance. Ti-40Nb-15HA alloy was found to give a favourable compression strength and low density at 171.93 MPa and 5.086 g/cm3, respectively. Thus, considering its mechanical properties, Ti-40Nb-15HA was found ideal for orthopaedic implant materials as it has properties closed to human bone.
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