In Vitro Bioactivity Test of FA Added with TiO2 of Different Phases Coated on Ti-6Al-4V Substrates by Nd-YAG Laser Cladding Process
Hydroxyapatite (HA) is a frequently used bioactive coating material. However, when HA coating is soaked in the simulated body fluid (SBF), it is usually detached from substrate material due to its high dissolution rate in the solution. Recently, it is found that Fluorapatite (FA) has a better anti-dissolution ability than HA. In this study, Fluorapatite was mixed with TiO2 powder (either Anatase phase (A) or Rutile phase (R)) as a coating material precursor, and then be deposited on Ti-6Al-4V substrate to form the coating layer by using Nd-YAG laser cladding process. After soaking in SBF for various days, it is observed that dense ball-like apatite grew faster on the surface of the FA+R coating layer than that on the surface of the FA+A specimens. The corresponding Ca/P ratios of FA+R specimens also dropped faster than FA+A ones.
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
C. S. Chien et al., "In Vitro Bioactivity Test of FA Added with TiO2 of Different Phases Coated on Ti-6Al-4V Substrates by Nd-YAG Laser Cladding Process", Advanced Materials Research, Vols. 287-290, pp. 2225-2229, 2011