2002-01-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/663985摘要：鈦鋁介金屬具有高的比強度及優良的高溫機械性質，但其800oC以上之氧化抵抗性質不佳，因而如何增進鈦鋁介金屬的高溫氧化抵抗是確有其研究上的需要。於合金設計中磷、鎢等是改善鈦鋁介金屬高溫氧化抵抗有利的元素，所以在磷酸等電解液中陽極處理鈦鋁介金屬來改善其高溫耐氧化性應是可行性的，然至今尚無相關的文獻報導。本研究第一年度將在磷酸等電解液中陽極處理γ-TiAl介金屬以增進其高溫的氧化抵抗，由改變陽極處理之條件如電解液種類、溶液濃度、溶液溫度、處理時間及直流電壓大小等參數，藉著氧化試驗來探討及了解陽極處理的各種變數對γ-TiAl介金屬氧化抵抗改善情況，並尋找出最佳之陽極處理條件。本研究第二、三年度擬利用純鋁濺鍍於鈦鋁介金屬表面的方法，再加上隨後低、高溫加熱處理之配合，將可在鈦鋁介金屬表面產生Al2O3層以增進其高溫氧化抵抗。其中第二年度將γ-TiAl濺鍍鋁及其後處理等最佳製程條件之探討；第三年度同第二年度，但改為α2-Ti3Al合金，而第三年度之研究必須以第二年度之成果為基礎，此因α2-Ti3Al與Al間之界面反應必會有γ-TiAl之產生也。<br> Abstract: Titanium aluminides have rather good specific strength and mechanical properties at high temperature, but the poor oxidation resistance at above 800℃ is still the bottleneck of their industrial application. A 3-year term's project is proposed. This project is aimed to improve the oxidation resistance at high temperature by surface modification of titanium aluminides, such as anodic coating in the phosphoric acid, Al-sputtering and subsequent interdiffusion treatment, etc. In the first year, γ-TiAl will be anodic-coated in phosphoric acid by changing the anodic temperature, current & voltage, acid concentration and anodic interval, etc and then the oxidation resistance at high temperature will be evaluated. In the second year, γ-TiAl will be Al-sputtered with thickness < 5μm and subsequent interdiffusion treatment at 600℃ in vacuum. A TiAl3 layer will be expected to form on the γ-TiAl and its oxidation resistance will be tested at high temperature. In the third year, all procedures is the same as the 2nd year, but now α2-Ti3Al, instead of γ-TiAl, will be conducted. From the results of this project, the oxidation resistance of titanium aluminides will be improved significantly by the above mentioned surface modifications.鈦鋁介金屬γ-TiAl及α2-Ti3Al高溫氧化抵抗陽極處理純鋁表面濺鍍及其後處理Titanium AluminidesOxidation ResistanceAnodizationAl-Sputtering