臺灣博碩士論文加值系統

摘要
近來由於鎳鈦合金具有特殊的形狀記憶效應，極佳的延展性，並具有擬彈性特性及良好的疲勞壽命，在工業界的數量有持續成長之趨勢，在醫療方面最具代表的應用就是牙齒矯正線。此外，鎳鈦合金具有良好的抗腐蝕能力和生物相容性。然而，鎳鈦超彈性合金也會因在口腔環境中受到腐蝕而使其超彈性的特性變差的議題也常被拿來討論。本篇研究的目的在於討論鎳鈦超彈性合金的機械性質，會因口腔內吸收氫的含量不同而引起微結構變化。
另外，經過氫作用是否能使鎳鈦合金產生表面結構變化將會更詳盡地討論與研究。為了研究氫在鎳鈦合金微結構及機械性質，鎳鈦合金的電子反應和表面性質藉由掃描式電子顯微鏡，低掠角X光繞射儀，熱示差分析儀和高解析電子能譜儀來觀察。其微結構變化機制更清楚顯示鎳鈦合金經過氫反應之後會產生氫的化合物。
本篇主要研究浸泡在口腔環境中氫化鈦的生成。而表層的結構會依氫的含量和在口腔環境中腐蝕週期不同而所不同。
氫化鈦主要形成於多孔洞的結構當中，多孔的氧化物層薄膜會引起氫的聚集。氫化鈦相在漸漸增加的腐蝕週期中生成。氫化鈦則是藉由鈦與氫作用而產生。多孔性的氫化鈦能增加氫脆化的可能，它的機械性質也會明顯地變化。我們相信，鎳鈦合金在口腔中的機械強度變化，氫化鈦扮演著一個很重要的角色。

Abstract
NiTi alloys have been increasing number of industrial and medical applications such as orthodontic arch wires and dental implants.
It is due to their unique shape memory, excellent ductility, better fatigue life as well as their superelastic effect. Moreover, NiTi alloys exhibit good corrosion resistance and biocompatibility. However, it has been reported that properties of NiTi alloys decrease in corrosive environments such as oral environment. In the present study, the purpose is to examine the hydrogen absorption induced the microstructure variations in oral environment on the degradation of the mechanical properties of NiTi alloys. In addition, NiTi alloys with and without hydrogen reaction will be investigated and discussed clearly.
To investigate the effect of hydrogen on microstructure and mechanical properties of NiTi alloys, the electrical behaviors and surface properties of NiTi alloys were analyzed by FESEM, GIXRD, DSC and HRXPS. The formation of titanium hydride was investigated by immersing NiTi alloys in oral environment. It revealed NiTi alloys with hydrogen charging induced titanium hydride compounds. The production of the compound phases was dependent on hydrogen contents and corrosion periods in oral environment. The titanium hydrides result in formation of porous structure. The porous hydride layer induced the high hydrogen aggregation.
The titanium hydride phase was formed as increasing corrosion periods in oral environment. Titanium hydride is obtained by titanium with hygrogen reaction. Porous titanium hydride can enhance hydrogen embrittlement. It will result in the mechanical strength decreases obviously. The titanium hydride plays an important role in decreasing mechanical strength. It is believed that microstructure variation of NiTi alloys in oral environment can induced strength decrease obviously.

Contents
Page
摘要 i
Abstract iii
誌謝 v
Contents vi
Abbreviations xi
Preface 1
Chapter 1 Introduction 2
1.1 General background 2
1.2 Motivation of this study 3
1.3 Purpose of this study 3
1.4 Hypothesis of this study 5
1.5 Organization of the thesis 6
Chapter 2 Literature Review 7
2.1 Properties of Ti-based alloy 7
2.2 Properties of NiTi alloys 8
2.3 Characterization of TiO2 on NiTi alloys 12
2.4 Decomposition and Absorption Mechanisms 14
2.4.1 The Oral environment 14
2.4.2 Corrosion and Degradation 14
2.4.3 Toxicodynamic Considerations 14
2.4.4 Influence of treatment 15
2.4.5 Addition and impuruties 16
Chapter 3 Materials and Methods 17
3.1 Materials and sample pretreatment 17
3.2 Surface characterization 17
3.3 Experiment instruments 19
Chapter 4 Results 28
Chapter 5 Discussion 50
Chapter 6 Conclusions 52
References 53

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