Nanoindentation and nano-scratching of hydroxyapatite coatings for resorbable magnesium alloy bone implant applications

Patrick Lemoine; Jonathan Acheson; Stephen McKillop; Jeroen JJP. van den Beucken; Joanna Ward; Adrian Boyd; Brian Meenan

doi:10.1016/j.jmbbm.2022.105306

Nanoindentation and nano-scratching of hydroxyapatite coatings for resorbable magnesium alloy bone implant applications

Patrick Lemoine
, Jonathan Acheson
, Stephen McKillop
, Jeroen JJP. van den Beucken
, Joanna Ward
, Adrian Boyd
, Brian Meenan

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

488 Downloads (Pure)

Abstract

The corrosion rate of Mg alloys is currently too high for viable resorbable implant applications. One possible solution is to coat the alloy with a hydroxyapatite (HA) layer to slow the corrosion and promote bone growth. As such coatings can be under severe stresses during implant insertion, we present a nano-mechanical and nano-tribological investigation of RF-sputtered HA films on AZ31 Mg alloy substrates. EDX and XRD analysis indicate that as-deposited coatings are amorphous and Ca-deficient whereas rapid thermal annealing results in c-axis orientation and near-stoichiometric composition. Analysis of the nanoindentation data using a thin film model shows that annealing increases the coating's intrinsic hardness (H) and strain at break (H/E) values, from 2.7 GPa to 9.4 GPa and from 0.043 to 0.079, respectively. In addition, despite being rougher, the annealed samples display better wear resistance; a sign that the rapid thermal annealing does not compromise their interfacial strength and that these systems have potential for resorbable bone implant applications.

Original language	English
Article number	105306
Journal	Journal of the Mechanical Behavior of Biomedical Materials
Volume	133
Early online date	7 Jun 2022
DOIs	https://doi.org/10.1016/j.jmbbm.2022.105306
Publication status	Published (in print/issue) - 30 Sept 2022

Bibliographical note

Funding Information:
Authors would like to acknowledge the Department for Economy (DfE), Northern Ireland for funding of the US-Ireland Centre-to-Centre partnership associated with this work (USI 111). Support of the United States NSF-ERC (Grant No. EEC-0812348) is also acknowledged.

Publisher Copyright:
© 2022 The Authors

Funding

Funding Information: Authors would like to acknowledge the Department for Economy (DfE), Northern Ireland for funding of the US-Ireland Centre-to-Centre partnership associated with this work (USI 111). Support of the United States NSF-ERC (Grant No. EEC-0812348) is also acknowledged. Publisher Copyright: © 2022 The Authors

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 3 Good Health and Well-being

Keywords

hydroxyapatite
resorbable bone implant
magnesium alloy
nanoindentation
nanotribology
Nanotribology
Resorbable bone implant
Magnesium alloy
Nanoindentation
Hydroxyapatite

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10.1016/j.jmbbm.2022.105306

1-s2.0-S1751616122002193-main (1)Final published version, 11.9 MBLicence: CC BY-NC-ND

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title = "Nanoindentation and nano-scratching of hydroxyapatite coatings for resorbable magnesium alloy bone implant applications",

abstract = "The corrosion rate of Mg alloys is currently too high for viable resorbable implant applications. One possible solution is to coat the alloy with a hydroxyapatite (HA) layer to slow the corrosion and promote bone growth. As such coatings can be under severe stresses during implant insertion, we present a nano-mechanical and nano-tribological investigation of RF-sputtered HA films on AZ31 Mg alloy substrates. EDX and XRD analysis indicate that as-deposited coatings are amorphous and Ca-deficient whereas rapid thermal annealing results in c-axis orientation and near-stoichiometric composition. Analysis of the nanoindentation data using a thin film model shows that annealing increases the coating's intrinsic hardness (H) and strain at break (H/E) values, from 2.7 GPa to 9.4 GPa and from 0.043 to 0.079, respectively. In addition, despite being rougher, the annealed samples display better wear resistance; a sign that the rapid thermal annealing does not compromise their interfacial strength and that these systems have potential for resorbable bone implant applications.",

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AU - Ward, Joanna

AU - Boyd, Adrian

AU - Meenan, Brian

N1 - Funding Information: Authors would like to acknowledge the Department for Economy (DfE), Northern Ireland for funding of the US-Ireland Centre-to-Centre partnership associated with this work (USI 111). Support of the United States NSF-ERC (Grant No. EEC-0812348) is also acknowledged. Publisher Copyright: © 2022 The Authors

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N2 - The corrosion rate of Mg alloys is currently too high for viable resorbable implant applications. One possible solution is to coat the alloy with a hydroxyapatite (HA) layer to slow the corrosion and promote bone growth. As such coatings can be under severe stresses during implant insertion, we present a nano-mechanical and nano-tribological investigation of RF-sputtered HA films on AZ31 Mg alloy substrates. EDX and XRD analysis indicate that as-deposited coatings are amorphous and Ca-deficient whereas rapid thermal annealing results in c-axis orientation and near-stoichiometric composition. Analysis of the nanoindentation data using a thin film model shows that annealing increases the coating's intrinsic hardness (H) and strain at break (H/E) values, from 2.7 GPa to 9.4 GPa and from 0.043 to 0.079, respectively. In addition, despite being rougher, the annealed samples display better wear resistance; a sign that the rapid thermal annealing does not compromise their interfacial strength and that these systems have potential for resorbable bone implant applications.

AB - The corrosion rate of Mg alloys is currently too high for viable resorbable implant applications. One possible solution is to coat the alloy with a hydroxyapatite (HA) layer to slow the corrosion and promote bone growth. As such coatings can be under severe stresses during implant insertion, we present a nano-mechanical and nano-tribological investigation of RF-sputtered HA films on AZ31 Mg alloy substrates. EDX and XRD analysis indicate that as-deposited coatings are amorphous and Ca-deficient whereas rapid thermal annealing results in c-axis orientation and near-stoichiometric composition. Analysis of the nanoindentation data using a thin film model shows that annealing increases the coating's intrinsic hardness (H) and strain at break (H/E) values, from 2.7 GPa to 9.4 GPa and from 0.043 to 0.079, respectively. In addition, despite being rougher, the annealed samples display better wear resistance; a sign that the rapid thermal annealing does not compromise their interfacial strength and that these systems have potential for resorbable bone implant applications.

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KW - nanotribology

KW - Nanotribology

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KW - Magnesium alloy

KW - Nanoindentation

KW - Hydroxyapatite

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Nanoindentation and nano-scratching of hydroxyapatite coatings for resorbable magnesium alloy bone implant applications

Abstract

Bibliographical note

Funding

UN SDGs

Keywords

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