Corrosion and mechanical properties of atomic layer deposited TiO.sub.2./sub. Coatings on NiTi implants

0486501 - FZÚ 2018 RIV US eng C - Conference Paper (international conference)
Kei, C.C. - Yu, Y.H. - Racek, Jan - Vokoun, David - Kadeřávek, Lukáš
Corrosion and mechanical properties of atomic layer deposited TiO₂ Coatings on NiTi implants.
Proceedings of IEEE International Conference on Industrial Technology (ICIT) 2016. New York: IEEE, 2016, s. 1328-1332. ISBN 978-1-4673-8075-1.
[IEEE International Conference on Industrial Technology (ICIT). Taipei (TW), 14.03.2016-17.03.2016]
Institutional support: RVO:68378271
Keywords : atomic layer deposition * NiTi alloy * corrosion * mechanical tests
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

In the case of biomedical NiTi implants staying in the human body not only for a short time, a release of Ni ions from NiTi surface should be prevented because of the poisonous character of Ni. We modified the surface of NiTi plate samples by depositing TiO2 oxide using atomic layer deposition (ALD). We found excellent corrosion properties of the coated NiTi samples, implying that ALD has great potential in depositing protection or biocompatible layer for 3D printing. Additionally, using a mechanical tester installed in the sample chamber of a scanning electron microscope, we were not able to see any tensile-loadinduced microcracks in the thin atomic layer deposited TiO2 coating. Whereas the TiO2 layers grown thermally by oxidizing NiTi at temperature around 450 degrees C contained densely distributed microcracks during loading.
Permanent Link: http://hdl.handle.net/11104/0281300