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*

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

6 Atıf (Scopus)

Özet

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.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)1414-1427
Sayfa sayısı14
DergiJournal of Thermal Spray Technology
Hacim27
Basın numarası8
DOI'lar
Yayın durumuYayınlandı - 1 Ara 2018

Bibliyografik not

Publisher Copyright:
© 2018, ASM International.

Finansman

Acknowledgments This work has been carried out with the financial support provided by The Scientific and Technological Research Council of Turkey (TUBITAK) under Contract No. 214M246. The authors would like to thank Mr. A. Nazim of Gebze Technical University for carrying out SEM investigations and Mr. O. F. Deniz of Gebze Technical University for 3D surface profilometer examinations. The authors would also like to thank Mr. F. Muhaffel for conducting depth sensing ultra-micro-hardness measurements. This work has been carried out with the financial support provided by The Scientific and Technological Research Council of Turkey (TUBITAK) under Contract No. 214M246. The authors would like to thank Mr. A. Nazim of Gebze Technical University for carrying out SEM investigations and Mr. O. F. Deniz of Gebze Technical University for 3D surface profilometer examinations. The authors would also like to thank Mr. F. Muhaffel for conducting depth sensing ultra-micro-hardness measurements.

FinansörlerFinansör numarası
TUBITAK
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu214M246

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