Combinatorial Evaluation of Anodic Polarization Behavior of High Formable Shape Memory Alloys

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  • 高成形性形状記憶合金のアノード分極特性のコンビナトリアル評価

Abstract

<p>In this study, we proposed combinatorial evaluation methods for biocompatibility of high formable shape memory alloys (HFSMAs) by anodic polarization tests, which is one of biocompatibility evaluation indicators. Evaluation substrates for evaluating anodic polarization characteristics were designed and fabricated, validity of proposed evaluation substrates was confirmed. The evaluation substrate was fabricated by micro electro mechanical systems (MEMS) processes. 9 Ti-Ni-Zr samples which have same composition were prepared on the glass substrate by a r.f. magnetron sputtering system. We evaluated anodic polarization characteristics of HFSMA using proposed evaluation substrates. In the anodic polarization tests, the evaluation substrate was immersed in physiological saline (NaCl solution of 9 g/L) at 37°C, the polarization curves were obtained by sweeping the potential. The results of the polarization curves of each sample were compared and the variation of data was investigated. As the results, the standard deviation from the average value of the passivation potential (Pcrt) was about 2 %, and the polarization curves showed the same tendency. We concluded that the validity of proposed evaluation substrate was confirmed.</p>

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