Mechanical and biological properties of atmospheric plasma-sprayed carbon nanotube-reinforced tantalum pentoxide composite coatings on Ti6Al4V alloy
Document Type
Article
Publication Date
5-1-2022
Abstract
Ta2O5 coatings containing 0, 3, 5 and 7 vol% multi-walled carbon nanotubes (CNTs) were deposited on Ti6Al4V substrates by atmospheric plasma spraying (APS). The addition of CNTs had no obvious effect on the surface morphology and roughness of the coatings, but increased the coating porosity. The coatings consisted primarily of beta-Ta2O5 phase, a small amount of alpha-Ta2O5 , and minor C peaks corresponding to the CNTs. As the CNT content increased, the elastic modulus (E) and indentation fracture toughness also increased. However, the higher CNT content increased the coating porosity and reduced the microhardness. Following immersion in simulated body fluid (SBF) for 14 days, the surfaces of all the coatings were completely covered with hemispherical bone-like apatite. Furthermore, after incubation in osteoblast-like osteosarcoma MG-63 cell culture for 7 days, all of the coatings showed excellent cell attachment, growth and spreading. Overall, the present results show that the addition of CNTs to Ta2O5 raw powder improves the indentation fracture toughness of the resulting coatings without degrading their biological properties.
Keywords
Atmospheric plasma spraying (APS), Multi-walled carbon nanotubes (CNT), Ti6Al4V alloy, Biological property, Indentation fracture toughness, Tantalum pentoxide (Ta2O5)
Divisions
mechanical
Funders
Ministry of Science and Technology, Taiwan (MOST 108-2221-E-218-09-),Electro-Optics Research Division of National Chung-Shan Institute of Science and Technology, Taiwan
Publication Title
Surface and Coatings Technology
Volume
437
Publisher
Elsevier
Publisher Location
PO BOX 564, 1001 LAUSANNE, SWITZERLAND