Formation of Hydroxyapatite on Ti-Coated Ti-Zr-Cu-Pd Bulk Metallic Glass

Abstract

In this research, Ti coating was conducted on Ti40Zr10Cu36Pd14 bulk metallic glass (BMG) in order to increase the formation rate of hydroxyapatite layer. The formation behavior of bone-like hydroxyapatite on Ti-coated and uncoated Ti40Zr10Cu36Pd14 bulk metallic glasses (BMGs) was studied. The surface morphology of Ti-coated and uncoated Ti40Zr10Cu36Pd14 BMG was investigated by scanning electron microscopy and energy dispersive X-ray spectroscopy. The results revealed that the alkali pretreatment in 5 M NaOH solution at 60°C for 24 h had a beneficial effect on the formation of porous sodium titanate on Ti-coated Ti40Zr10Cu36Pd14 BMG. A bone-like hydroxyapatite layer was able to form on the alkali-treated Ti-coated Ti40Zr10Cu36Pd14 BMG after a short-time immersion in simulated body fluid (SBF). On the contrary, hydroxyapatite formation was not observed on the uncoated Ti40Zr10Cu36Pd14 BMG after the same chemical treatments.