title: Characterization and formation mechanism of nano-structured hydroxyapatite coatings deposited by the liquid precursor plasma spraying process.
abstract: Nano-structured hydroxyapatite (HA) coatings were deposited on the Ti-6Al-4V alloy substrate by the liquid precursor plasma spraying (LPPS) process. The thermal behavior of the HA liquid precursor was analyzed to interpret the phase change and structure transformation during the formation process of the nano-structured HA coatings. The phase composition, structure and morphology of the nano-structured HA coatings were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectroscopy. The XRD spectra showed that the coatings deposited by the LPPS process mainly consisted of the HA phase and the crystallite size was measured to be 56 nm. The SEM observation showed that the as-deposited LPPS coatings had small splat size, and nano-scale HA particles were found in certain regions of the coating surface. The FTIR spectroscopy showed the strong presence of the OH(-) group in the as-deposited LPPS coatings, indicating a superior structural integrity. In addition, the coatings deposited by the LPPS process were also carbonated HA coatings. The results indicate that the LPPS process is a promising plasma spraying technique for depositing nano-structured HA coatings with unique microstructural features that are desirable for improving the biological performance of the HA coatings.
authors.affiliation: National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Huang
authors.forename: Lei
authors.initials: L
authors.lastname: Song
authors.forename: Tao
authors.initials: T
authors.lastname: Huang
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Liu
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Xiao
authors.forename: Yao
authors.initials: Y
authors.lastname: Wu
authors.forename: Fang
authors.initials: F
authors.lastname: Wu
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Gu
mesh_terms: D000497:Alloys; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis / Q000737:chemistry; D017886:Durapatite / Q000138:chemical synthesis / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D049329:Nanostructures / Q000737:chemistry; D058626:Plasma Gases / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D058626:Plasma Gases; C031462:titanium alloy (TiAl6V4); D017886:Durapatite; D014025:Titanium