Thermal Oxidation of Cold Sprayed Titanium-Based Coating Deposited on Co-Cr Alloy

Dogukan Cetiner, A. Hilmi Paksoy, Onur Tazegul, Murat Baydogan, Hasan Guleryuz, Huseyin Cimenoglu, Erdem Atar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This study focuses on the surface modification of a medical grade Co-Cr alloy via combining cold spray and thermal oxidation processes. After deposition of a Ti96-Al4 (wt.%) coating, samples were oxidized at 600 °C for 60 h in air. Oxidation transformed the coating into a dual-layered structure comprising an outer oxide layer (mainly rutile) with a diffusion layer (mainly oxygen enriched titanium and Ti-Al intermetallics) beneath it. Formation of new phases made the diffusion layer brittle and prone to fracture during pull out tests. Scratch and Rockwell-C tests confirmed good adhesion between the oxide and underlying diffusion layers, having average hardness as 1297 HV and 387 HV, respectively. The dual-layer coating exhibited excellent wear performance in a 0.9 wt.% NaCl solution against sliding action of alumina ball as compared to Co-Cr substrate, especially at contact pressures < 1200 MPa, while the maximum in vivo contact pressure is < 15 MPa for load-bearing orthopedic implants. Furthermore, the release of the aluminum from the dual-layer coating into 0.9 wt.% NaCl solution is lower than the permissible limit stated by the International Agency for Research on Cancer.

Original languageEnglish
Pages (from-to)1414-1427
Number of pages14
JournalJournal of Thermal Spray Technology
Volume27
Issue number8
DOIs
Publication statusPublished - 1 Dec 2018

Bibliographical note

Publisher Copyright:
© 2018, ASM International.

Keywords

  • Co-Cr alloy
  • coating
  • cold spray
  • thermal oxidation
  • titanium
  • wear

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