Evaluation of fatigue strength of Me-DLC coating on NiTi shape memory alloy for medical applications

Issue title: Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part II

Article type: Research Article

Authors: Shiota, Hiroyuki^a | Takeno, Takanori^b | Miki, Hiroyuki^c | Takagi, Toshiyuki^{c; *}

Affiliations: [a] Graduate School of Engineering, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980--8578, Japan | [b] Institute for International Advanced Interdisciplinary Research, Tohoku University International Advanced Research and Education Organization, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan | [c] Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, Japan

Correspondence: [*] Corresponding author: Toshiyuki Takagi, E-mail: takagi@ifs.tohoku.ac.jp

Abstract: The fatigue strength of Me-DLC coating on NiTi shape memory alloy was investigated. Me-DLC was deposited on SMA by radio-frequency chemical vapor deposition and co-sputtering of metal target. The fatigue strength of Me-DLC has been evaluated by applying 1% cyclic bending strain. The surfaces of the coating were observed after bending test by using an optical microscope, a scanning electron microscope and an atomic force microscope. In the result of 1% cyclic bending test, fatigue strength was improved by metal addition. The investigated coating can endure the cyclic bending test up to 10^{5}.

Keywords: Diamond-like carbon, fatigue strength, shape memory alloy

DOI: 10.3233/JAE-2010-1206

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 3-4, pp. 947-952, 2010