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Preparation of hydroxyapatite layer on Ti-based bulk metallic glasses by acid and alkali pre-treatment

Research paper by Hao Hu, Zhen-Duo Cui, Sheng-Li Zhu, Zhao-Yang Li, Yan-Qin Liang, Xian-Jin Yang

Indexed on: 07 Nov '14Published on: 07 Nov '14Published in: Rare Metals



Abstract

In this paper, a thin calcium phosphate layer was prepared on the surface of Ti40Zr10Cu36Pd14 bulk metallic glasses (BMGs). All samples were dipped in HNO3 aqueous solution and boiled in 1.2 mol·L−1 NaOH aqueous solution. After the two preliminary treatment steps, they were soaked in simulated body fluid (SBF) to form an apatite layer on the surface. After immersion for 12 days, a coating composed mainly of Ca–P particles was rapidly deposited on the surface of Ti40Zr10Cu36Pd14 bulk metallic glasses. The surfaces of chemically treated samples and the samples after immersion in SBF were characterized by X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and energy dispersive spectroscopy (EDS). Analysis results indicate that this apatite coating consists of Ca–P particles with different diameters. In addition, the Ca/P ratio of the apatite coatings immersed for 14 days is 1.62, which is close to that of hydroxyapatite (HA).