Effect of electro-discharging modifications on new Fe-based mini-implant alloy

• Main Authors: Yi-Jung Lu, 呂宜蓉
• Other Authors: Keng-Liang Ou
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/12806370630814159377

碩士 === 臺北醫學大學 === 生醫材料暨工程研究所 === 97 === This investigation elucidates the biocompatibility and microstructural variation of Fe-Al-Mn and electro-discharged Fe-Al-Mn alloys. A recast layer was formed on the alloy surface, following electro-discharged machining. ??-phase and Fe0.6Mn5.4C2 carbide (κ-carbide) were formed on the recast layer following electro-discharging. The ??-phase and κ-carbide are nanostructures. The nano-(??-phase + κ-carbide) have important roles in forming nanostructured oxide layer. In order to realize chemical composition, energy dispersive X-ray spectrometer (EDS) and X-ray photoelectron spectrometer (XPS) were performed. XPS was performed to detect the oxide film thickness by depth profile analysis. Pore sizes were observed by field emission scanning electron microscopy (FESEM). Microstructural variation was analyzed by cross-section transmission electron microscope (XTEM) and transmission electron microscope (TEM).Furthermore, electro-discharging not only generates a nanostructural recast layer, but also converts the alloy surface into a nanostructured oxide surface, increasing the alloy biocompatibility.