Surface microstructure and bioactivity of hydroxyapatite and fluorapatite coatings deposited on Ti-6Al-4V substrates using Nd-YAG laser

Chi Sheng Chien, Ze Yuan Liao, Ting Fu Hong, Tsung Yuan Kuo, Chih-Han Chang, Ming-Long Yeh, Tzer-Min Lee

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Hydroxyapatite (HA) and fluorapatite (FA) coatings were deposited on Ti-6Al-4V substrates with an Nd-YAG laser and then immersed in simulated body fluid (SBF) for up to 21 days to evaluate their bioactivity. Prior to SBF immersion, the coating layer of the HA specimen had a coral-like structure, and was mainly composed of Ti, CaTiO3, TiO2, Al2O3, and Ca2P2O7, whereas that of the FA specimen had a dense cellular-like structure, and was mainly composed of Ti, CaTiO3, TiO2, Al2O3, and residual FA. The Ca/P ratios of the HA and FA coating layers were 7.61 and 2.12, respectively. After 21 days of immersion in SBF, only a very small amount of precipitates, mainly consisting of CaCO3 with some hydroxycarbonated apatite (HCA) and HA, formed on the HA coating layer, whose Ca/P ratio retained a high value of 6.34. In contrast, a dense accumulation of granulated precipitates, mainly consisting of HCA, formed on the FA coating layer after just 7 days of SBF immersion, with a corresponding Ca/P ratio of 1.63. The SBF immersion test shows that FA coatings produced via an Nd-YAG laser cladding technique on a Ti-6Al-4V substrate have better bioactivity than that of their HA counterparts.

Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalJournal of Medical and Biological Engineering
Volume34
Issue number2
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering

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