Comparative investigation into effects of ZrO 2 and Al 2 O 3 addition in fluorapatite laser-clad composite coatings on Ti6Al4V alloy

Tsung Yuan Kuo, Chi Sheng Chien, Cheng Wei Liu, Tzer-Min Lee

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)157-169
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Volume233
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1

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Composite coatings
Coatings
Lasers
Microhardness
Interdiffusion (solids)
Laser cladding
Yttrium oxide
Body fluids
Osteoblasts
Apatite
Bioactivity
Biocompatibility
Phase composition
Zirconia
Bone
Alumina
Phase transitions
Substrates

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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title = "Comparative investigation into effects of ZrO 2 and Al 2 O 3 addition in fluorapatite laser-clad composite coatings on Ti6Al4V alloy",
abstract = "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.",
author = "Kuo, {Tsung Yuan} and Chien, {Chi Sheng} and Liu, {Cheng Wei} and Tzer-Min Lee",
year = "2019",
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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

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AU - Lee, Tzer-Min

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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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