- 學位論文
陽極氧化Ti-Nb-Mo合金於顏色、耐蝕性 及生物相容性之研究
Color, Corrosion Resistance and Biocompatibility of Anodized Ti-Nb-Mo Alloy
摘要
Ti-Nb-Mo合金具有較高的強度和低彈性模數，可被應用於牙科植體。因此本研究目的在探討Ti-Nb-Mo合金作為植體應用時之顏色、耐蝕性、生物活性及生物相容性之研究。實驗結果顯示Ti-Nb-Mo合金在NH4BF4溶液中，以不同電壓下陽極氧化時，合金表面可產生黃色、黃棕色、深藍色、藍綠色和桃紫色。使用XPS分析得到陽極氧化層的厚度範圍為2.68至293.97 nm，氧化膜的厚度會隨電壓增加而增加。另外，在Hank’s溶液中之OCP曲線發現Ti-Nb-Mo合金可以很快即達到穩定之電位，表示表面具有穩定的鈍化層。動態極化曲線獲得腐蝕電位在-0.52〜-0.40 V，腐蝕電流密度範圍為0.01~0.21 µA cm-2。以上結果顯示Ti-Nb-Mo合金經陽極氧化後腐蝕速率均會降低，其中以10 V陽極氧化的試片具有最低的腐蝕電流密度0.09 µA cm-2。接著進行生物活性評估，發現試片在SBF溶液中浸泡7、14和21天，利試片表面均形成鈣磷的沉積物，以HR-XRD分析表面沉積物為磷灰石。在生物相容性方面，試片與MG63細胞進行共培養1、4和7天，FE-SEM觀察到試片表面的細胞貼附情形，第一天時細胞尾足延伸，第四天時細胞開始分裂，在第七天時細胞已有堆疊的情形，綜合以上結果證實Ti-Nb-Mo合金經過陽極氧化後，表面可形成不同顏色之氧化膜，此緻密的氧化膜具有良好之耐蝕性；也顯示具有好的生物活性及生物相容性。
並列摘要
The newly developed Ti-Nb-Mo alloy, which has a high strength/modulus ratio, is an exciting candidate for use in dental implants. In this study, the surface color and corrosion properties of Ti-Nb-Mo alloy were investigated for dental applications. We successfully produced different colored surfaces of Ti-Nb-Mo alloy using the anodic method at different voltages in NH4BF4 solution and found that the alloy can exhibit light-yellow (at 5 V), yellow-brown (at 10 V), dark-blue (at 200 V), blue-green (at 30 V), and peach-purple (at 50 V). The thickness of the anodized layer of Ti-Nb-Mo was measured by XPS and could be found that by increasing the anodized voltage and consequently increasing the anodic film thickness. During corrosion testing, the open circuit potential (OCP) of the samples that were immersed in Hank’s solution were in the range of -0.20 V to -0.37 V, which showed that Ti-Nb-Mo alloy could quickly form a stable passivation layer. The corrosion rate of the anodized samples (10 V~50 V) and the non-anodized sample were tested by potentiodynamic polarization in Hank’s solution. The results showed that corrosion potentials were in the range of -0.52~-0.40 V. The corrosion rate of the non-anodized sample (0.21 µA cm-2) was higher than anodized sample (in the range of 0.01~0.12 µA cm-2). Importantly, the 10 V anodized sample had the lowest corrosion rate. The 5 V and 10 V anodized samples were selected for bioactivity and biocompatibility testing because their color was similar to that of natural teeth. For the bioactivity test, the samples were immersed in SBF solution for 7, 14, and 21 days. The results showed that the surface of the anodized samples (5 V and 10 V) were covered in a denser apatite layer than what was found on the non-anodized sample. For the biocompatibility test, samples were co-cultured with MG63 cells for 1, 4, and 7 days. FE-SEM images of the 5 V and 10 V anodized samples showed cell extension at 1 day, cell division at 4 days, and cell stacking at 7 days. The above results demonstrated a higher cell activity and more cell growth than what was found on the non-anodized sample. In summary, the color and thickness of the anodized layer of Ti-Nb-Mo alloy can be changed and the corrosion rate will decrease after treatment with anodization. The anodized samples showed superior corrosion resistance, bioactivity, and biocompatibility.
參考文獻
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