TY - JOUR
T1 - Surface properties and in vitro bioactivity of fluorapatite/TiO2 coatings deposited on Ti substrates by Nd
T2 - YAG laser cladding
AU - Chien, Chi Sheng
AU - Ko, Yu Sheng
AU - Kuo, Tsung Yuan
AU - Liao, Tze Yuan
AU - Lin, Huan Chang
AU - Lee, Tzer Min
AU - Hong, Ting Fu
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided to this study by the Chimei Foundation Hospital, Republic of China (Taiwan), under Grant 110980191.
Publisher Copyright:
© Taiwanese Society of Biomedical Engineering 2015.
PY - 2015/6
Y1 - 2015/6
N2 - Fluorapatite (FA)/TiO2 composite coatings were deposited on Ti-6Al-4V substrates with an Nd:YAG laser cladding process. Two TiO2 powder phases, namely anatase (A) and rutile (R), were used. After cladding, the FA/TiO2(R) specimen had a rougher surface morphology than that of FA/TiO2(A). Both coatings had a cellular-like main microstructure near the interface of the coating (CL) and transition layers (TL). However, a fine metallurgical bonding state was found that existed between CL and TL of the FA/TiO2(R) specimen. The X-ray diffraction (XRD) analysis results show that the coatings of both specimens were composed principally of FA, CaTiO3, and Al2O3 phases. With the high-energy-density laser cladding process, a portion of the FA in the original coating material remained, while all of the TiO2 powder was decomposed and reacted with the Ca in the FA (Ca-rich phase) to produce CaTiO3. Upon immersion of the clad specimens in simulated body fluid, apatite grew more rapidly on the FA/ TiO2(R) coating than on the FA/TiO2(A) coating. The Ca/P ratio of the FA/TiO2(R) specimen approached the ideal bioactivity value after just 2 days of immersion. In contrast, that of the FA/TiO2(A) specimen did not reach the ideal value until 7 days of immersion. Furthermore, a peak corresponding to hydroxycarbonated apatite (HCA) appeared in the XRD patterns of both specimens. For the FA/TiO2(R) specimen, this HCA peak appears after a shorter immersion time. The FA/TiO2(R) specimen with a rougher surface morphology had better in vitro bioactivity than that of FA/TiO2(A).
AB - Fluorapatite (FA)/TiO2 composite coatings were deposited on Ti-6Al-4V substrates with an Nd:YAG laser cladding process. Two TiO2 powder phases, namely anatase (A) and rutile (R), were used. After cladding, the FA/TiO2(R) specimen had a rougher surface morphology than that of FA/TiO2(A). Both coatings had a cellular-like main microstructure near the interface of the coating (CL) and transition layers (TL). However, a fine metallurgical bonding state was found that existed between CL and TL of the FA/TiO2(R) specimen. The X-ray diffraction (XRD) analysis results show that the coatings of both specimens were composed principally of FA, CaTiO3, and Al2O3 phases. With the high-energy-density laser cladding process, a portion of the FA in the original coating material remained, while all of the TiO2 powder was decomposed and reacted with the Ca in the FA (Ca-rich phase) to produce CaTiO3. Upon immersion of the clad specimens in simulated body fluid, apatite grew more rapidly on the FA/ TiO2(R) coating than on the FA/TiO2(A) coating. The Ca/P ratio of the FA/TiO2(R) specimen approached the ideal bioactivity value after just 2 days of immersion. In contrast, that of the FA/TiO2(A) specimen did not reach the ideal value until 7 days of immersion. Furthermore, a peak corresponding to hydroxycarbonated apatite (HCA) appeared in the XRD patterns of both specimens. For the FA/TiO2(R) specimen, this HCA peak appears after a shorter immersion time. The FA/TiO2(R) specimen with a rougher surface morphology had better in vitro bioactivity than that of FA/TiO2(A).
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U2 - 10.1007/s40846-015-0048-1
DO - 10.1007/s40846-015-0048-1
M3 - Article
AN - SCOPUS:84943140941
SN - 1609-0985
VL - 35
SP - 357
EP - 366
JO - Journal of Medical and Biological Engineering
JF - Journal of Medical and Biological Engineering
IS - 3
ER -