Improvements in bioactivity, blood compatibility, and wear resistance of thermally sprayed carbon nanotube reinforced hydroxyapatite-based orthopedic implants
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Date
2024
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Publisher
Elsevier Ltd
Abstract
Titanium implants often fail due to aseptic loosening and non-hemocompatibility, necessitating costly revision surgeries. This study investigated the wear performance and biocompatibility of high-velocity oxy-fuel (HVOF) sprayed-hydroxyapatite (HA) and HA/alumina-19 wt%/carbon nanotube (CNT)− 1 wt% (HAC1) coatings. The novel heterocoagulation colloidal technique effectively dispersed CNTs, enhancing adhesion strength by ∼120 %, hardness by ∼45 %, and wear resistance by ∼32 % in simulated body fluid (SBF) and 17 % in dry conditions versus HA coatings, attributed to the low coefficient of friction (CoF) (1.16–1.48 times than HA) due to lubrication offered by peeled-off graphite layers from the CNT surface. Additionally, HAC1 implants exhibited superior apatite growth (∼52 % than HA), excellent non-hemolytic behavior (∼0.2 %), and no platelet activation, making it highly promising for orthopedic applications. © 2024 Elsevier Ltd
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Keywords
Biocompatibility, Blood, Friction, HVOF thermal spraying, Hydroxyapatite, Phosphate minerals, Reinforcement, Sprayed coatings, Tribology, Wear of materials, Wear resistance, Aseptic loosening, Blood compatibility, Haemocompatibility, Hetero-coagulation, High velocity oxy fuel, Orthopaedic implants, Revision surgery, Titanium implants, Tribological behaviour, Wear performance, Carbon nanotubes
Citation
Tribology International, 2024, 197, , pp. -