Investigation of Thermal properties, Chemical Analysis and Biocompatibility of High Temperature Oxidized NiTiMn Shape Memory Alloy

Yıl 2018, Cilt: 1 Sayı: 2, 25 - 35, 30.11.2018

Mediha Kök

Öz

In recent years, studies have been conducted on the
biocompatibility of NiTi-based shape-memory alloys, which are used in medical
application. In this study, the oxidation process of Ni₄₈Ti₅₁Mn
alloy produced with Arc Melter Method with the Thermogravimetric Analysis
Device (TG/DTA) was performed to improve biocompatibility for three different
oxidation temperatures (600-700-800^oC). The oxidation rate of the
alloy that was exposed to isothermal oxidation was calculated. With the
increase in the oxidation temperature, the alloys were oxidized faster. The
change of the oxidation on the Shape-Memory Effect (SME) of the NiTiMn alloy
was determined by Differential Scanning Calorimetry (DSC), and it was observed
that the SME did not disappear. The changes occurring on the surface and on the
crystal structure of the alloy were determined by SEM-EDX and X-ray analyses.
It was determined with chemical analysis (EDX) that a TiO₂ layer was
formed on the alloy. The fact that the TiO₂ layer increased with the
increase in the oxidation temperature was supported with x-ray measurement
results. In this way, it was concluded that there was a protective oxide layer
on the surface of the alloy. ICP-MS measurements were done to determine
penetration of Ni,Ti and Mn element of oxides alloys in to Ringer solution.

Anahtar Kelimeler

NiTi based alloy, oxidation, phases, thermogravimetric analysis

Kaynakça

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