Surface modification induced phase transformation and structure variation on the rapidly solidified recast layer of titanium

Journal Article · Sat Aug 15 00:00:00 EDT 2015 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2015.06.004· OSTI ID:22476148

Tsai, Ming-Hung ^[1]; Haung, Chiung-Fang ^[2]; Shyu, Shih-Shiun ^[3]; Chou, Yen-Ru ^[4]; Lin, Ming-Hong ^[1]; Peng, Pei-Wen ^[2]; others, and

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1. Department of Mechanical Engineering and Graduate Institute of Mechanical and Precision Engineering, National Kaoshiung University of Applied Sciences, Kaoshiung 807, Taiwan (China)
2. School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan (China)
3. Department of Dentistry, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City 231, Taiwan (China)
4. Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei 110, Taiwan (China)

In this study, neodymium-doped yttrium orthovanadate (Nd:YVO{sub 4}) as a laser source with different scanning speeds was used on biomedical Ti surface. The microstructural and biological properties of laser-modified samples were investigated by means of optical microscope, electron microscope, X-ray diffraction, surface roughness instrument, contact angle and cell cytotoxicity assay. After laser modification, the rough volcano-like recast layer with micro-/nanoporous structure and wave-like recast layer with nanoporous structure were generated on the surfaces of laser-modified samples, respectively. It was also found out that, an α → (α + rutile-TiO{sub 2}) phase transition occurred on the recast layers of laser-modified samples. The Ti surface becomes hydrophilic at a high speed laser scanning. Moreover, the cell cytotoxicity assay demonstrated that laser-modified samples did not influence the cell adhesion and proliferation behaviors of osteoblast (MG-63) cell. The laser with 50 mm/s scanning speed induced formation of rough volcano-like recast layer accompanied with micro-/nanoporous structure, which can promote cell adhesion and proliferation of MG-63 cell on Ti surface. The results indicated that the laser treatment was a potential technology to enhance the biocompatibility for titanium. - Highlights: • Laser induced the formation of recast layer with micro-/nanoporous structure on Ti. • An α → (α + rutile-TiO{sub 2}) phase transition was observed within the recast layer. • The Ti surface becomes hydrophilic at a high speed laser scanning. • Laser-modified samples exhibit good biocompatibility to osteoblast (MG-63) cell.

• OSTI ID: 22476148
• Journal Information: Materials Characterization, Vol. 106; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
CONNECTIVE TISSUE CELLS
DOPED MATERIALS
ELECTRON MICROSCOPES
LASER RADIATION
LAYERS
MICROSTRUCTURE
MODIFICATIONS
NEODYMIUM
PHASE TRANSFORMATIONS
POROUS MATERIALS
PROLIFERATION
ROUGHNESS
RUTILE
SURFACES
TITANIUM
TITANIUM OXIDES
VANADATES
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS