TY - JOUR
T1 - Comparative investigation into effects of ZrO 2 and Al 2 O 3 addition in fluorapatite laser-clad composite coatings on Ti6Al4V alloy
AU - Kuo, Tsung Yuan
AU - Chien, Chi Sheng
AU - Liu, Cheng Wei
AU - Lee, Tzer Min
N1 - Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors gratefully acknowledge the financial support provided to this research by the Chimei Foundation Hospital, Republic of China (Taiwan), under grant number 110990223, and the Ministry of Science and Technology of the Republic of China (Taiwan) under grant number NSC 101-2221-E-218-017.
Publisher Copyright:
© IMechE 2018.
PY - 2019/2/1
Y1 - 2019/2/1
N2 - Composite coatings consisting of fluorapatite mixed with 20 wt% yttria (3 mol%) stabilized cubic phase zirconia (c-ZrO 2 , 3Y-TZP) or 20 wt% alumina (α-Al 2 O 3 ) were deposited on Ti6Al4V substrates using a Nd:YAG laser cladding system. The interface morphology, phase composition, micro-hardness and biological properties of the two coatings were examined and compared. The results showed that the fluorapatite/Al 2 O 3 specimen underwent a greater inter-diffusion at the interface between the coating layer and the transition layer than the fluorapatite/ZrO 2 specimen. During the cladding process, the ZrO 2 and Al 2 O 3 components of the coating were completely decomposed or underwent phase transformation. In addition, the fluorapatite was partially decomposed. For both specimens, the coating layers contained fluorapatite, CaF 2 and CaTiO 3 phases. The coating layer of the fluorapatite/ZrO 2 specimen additionally contained TTCP, CaO, CaZrO 3 and m-ZrO 2 (monoclinic phase), while that of the fluorapatite/Al 2 O 3 specimen contained β-TCP, CaAl 2 O 4 and θ-Al 2 O 3 . The average micro-hardness of the fluorapatite/ZrO 2 coating layer (1300 HV) was approximately 200 HV higher than that of the fluorapatite/Al 2 O 3 coating layer (1100 HV). Both specimens generated dense bone-like apatite following immersion in simulated body fluid for 3 days. In other words, both specimens had a good in vitro bioactivity. However, the fluorapatite/ZrO 2 specimen showed a better initial attachment and spread of osteoblast-like osteosarcoma MG63 cells than the fluorapatite/Al 2 O 3 specimen in in vitro biocompatibility tests performed for 24 h.
AB - Composite coatings consisting of fluorapatite mixed with 20 wt% yttria (3 mol%) stabilized cubic phase zirconia (c-ZrO 2 , 3Y-TZP) or 20 wt% alumina (α-Al 2 O 3 ) were deposited on Ti6Al4V substrates using a Nd:YAG laser cladding system. The interface morphology, phase composition, micro-hardness and biological properties of the two coatings were examined and compared. The results showed that the fluorapatite/Al 2 O 3 specimen underwent a greater inter-diffusion at the interface between the coating layer and the transition layer than the fluorapatite/ZrO 2 specimen. During the cladding process, the ZrO 2 and Al 2 O 3 components of the coating were completely decomposed or underwent phase transformation. In addition, the fluorapatite was partially decomposed. For both specimens, the coating layers contained fluorapatite, CaF 2 and CaTiO 3 phases. The coating layer of the fluorapatite/ZrO 2 specimen additionally contained TTCP, CaO, CaZrO 3 and m-ZrO 2 (monoclinic phase), while that of the fluorapatite/Al 2 O 3 specimen contained β-TCP, CaAl 2 O 4 and θ-Al 2 O 3 . The average micro-hardness of the fluorapatite/ZrO 2 coating layer (1300 HV) was approximately 200 HV higher than that of the fluorapatite/Al 2 O 3 coating layer (1100 HV). Both specimens generated dense bone-like apatite following immersion in simulated body fluid for 3 days. In other words, both specimens had a good in vitro bioactivity. However, the fluorapatite/ZrO 2 specimen showed a better initial attachment and spread of osteoblast-like osteosarcoma MG63 cells than the fluorapatite/Al 2 O 3 specimen in in vitro biocompatibility tests performed for 24 h.
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U2 - 10.1177/0954411918816113
DO - 10.1177/0954411918816113
M3 - Article
C2 - 30526304
AN - SCOPUS:85060053690
SN - 0954-4119
VL - 233
SP - 157
EP - 169
JO - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
JF - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
IS - 2
ER -