生醫用鈦合金(Ti-Nb系)之合金開發及機械性質研究

Study on Alloy Development and Mechanical Properties of Bio-medical Ti-alloys

洪炎輝(Yen-Huei Hon)

指導教授 ： 潘永寧

國立臺灣大學/工學院/機械工程學研究所/博士(2004年)

https://doi.org/10.6342/NTU.2004.01615

摘要

本研究依據人工關節植入件之性質要求，開發具低楊氏係數、高強度及生物相容性之Ti合金材料。首先針對現今應用最普遍之生醫用Ti合金，Ti-6Al-4V，探討各種加工製程對於合金內部及表層組織之影響。經切削、銑削及研磨後，其內部顯微組織基本上不發生任何變化，而表層組織則存在一細化層（內層）及一氧化層（外層），其中細化層厚度約1~2μm，氧化層厚度小於0.2μm。針對熱滾軋而言，在ㄐ洷]→β相變態溫度（957℃~997℃）以上進行滾軋時（如：1000℃及1100℃），晶粒有明顯粗化現象，而在變態溫度以下進行滾軋時（如：900℃），晶粒則會變細。經熱滾軋後，試片之表面會形成一表層組織（氧化層），該表層組織在人體體液下為一耐腐蝕之組織，且對細胞活性並無影響。鑄造後之晶粒較原素材粗大，表層具有一

關鍵字

人工關節 ； 鈦合金 ； 熱滾軋 ； 顯微組織 ； 人工關節植入材 ； 機械性質

並列摘要

This study attempts to develop Ti-alloys with elastic moduli that approach that of human bone, high strength and biocompatibility. Among the implant materials currently used, Ti-6Al-4V is the most widely used one for orthopedic application. First, This study examines the effects of various manufacturing processes, including machining (cutting, milling and grinding), hot rolling and casting, on the microstructure- both bulk and superficies of the biomedical grade Ti-6Al-4V alloy. The results indicate that after machining the microstructure of the bulk remains unchanged, while an oxide layer is evident at the surface; next to the outer-most layer, a very fine structure layer can be observed. Regarding the rolling process, at the rolling temperature of 900oC, the specimens show a slightly refined structure, whereas at 1000oC and 1100oC, they show a substantial coarse grain structure. The coarse structure of the 1000oC-rolled specimens can be refined substantially by re-rolling at temperatures lower than 957oC, which is the

並列關鍵字

Ti-alloys ； biocompatibility ； microstructure

參考文獻

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