Recently, composite materials have been widely used as orthopedic materials but there are some problems which cause only clinical research perform on these. In this study, hydroxyapatite nanoparticulate (Nano-HA) (10, 20, 30, 40, and 50 wt.%) reinforced ultrahigh molecular weight polyethylene (UHMWPE) nanocomposite was fabricated by compounding Nano-HA and UHMWPE mixtures in paraffin oil by medical grade using internal mixer at 180 ºC. Mechanical and tribological properties of samples were investigated by nanoindentation and nanoscratching method. Nanoindentation results showed sample with 50 wt.% Nano-HA exhibited a Young’s modulus and hardness 362.5% (4.625 times) and 200% (3 times) higher than control sample (pure UHMWPE), respectively. According to nanoscratching results sample with 50 wt.% Nano-HA had 63.57% (1.63 times) lower than control sample.

Keywords: Nanocomposite, Nanoindentation, Nanoscratch, Nano-HA, UHMWPE, Mechanical properties, Tribological properties

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