RF magnetron sputtering mediated NiTi/Ag coating on Ti-alloy substrate with enhanced biocompatibility and durability

Elangovan Thangavel, Vishnu Shankar Dhandapani, Karthigaimuthu Dharmalingam, Mohana Marimuthu, Murugan Veerapandian, Madhan Kumar Arumugam, Sanghyo Kim, Byungki Kim, Subramaniyan Ramasundaram, Dae Eun Kim

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Abstract

Mechanically robust, biocompatible and corrosion resistant Ag doped NiTi (NiTi/Ag) coatings were formed on implant grade commercially pure titanium substrates by R.F. magnetron sputtering. Five samples with varying silver content (0, 1, 3, 7, and 10 at.%) were prepared by controlling the power applied to Ag and NiTi targets. The intensity of X-ray photoelectron spectra peaks corresponding to Ni2p, Ti2p, Ag3d components were found proportional to respective coating compositions. The soft Ag crystallites were decreased the roughness and crystallinity of NiTi/Ag. Among all compositions, NiTi/Ag coating with 3 at.% Ag exhibited lowest friction coefficient (0.1) and wear rate (0.69 × 10 −07 mm 3 /N ∗ mm). Electrochemical corrosion measurements indicated that Ag incorporation increased the corrosion resistance of NiTi. Increase in Ag content shifted E corr values in the anodic direction, and reduced the current density by one-order-of-magnitude. When cultured on NiTi/Ag coating with 3 at.% Ag, human dermal fibroblast neonatal cells demonstrated highest cell viability. The fluorescence micrographic image of the immunostained cells showed a well grown actin filament network. Overall, NiTi/Ag coated titanium substrates were found to be a promising orthopedic implant material.

Original languageEnglish
Pages (from-to)304-314
Number of pages11
JournalMaterials Science and Engineering C
Volume99
DOIs
Publication statusPublished - 2019 Jun

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Thangavel, E., Dhandapani, V. S., Dharmalingam, K., Marimuthu, M., Veerapandian, M., Arumugam, M. K., Kim, S., Kim, B., Ramasundaram, S., & Kim, D. E. (2019). RF magnetron sputtering mediated NiTi/Ag coating on Ti-alloy substrate with enhanced biocompatibility and durability. Materials Science and Engineering C, 99, 304-314. https://doi.org/10.1016/j.msec.2019.01.099