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研究生： 許傑丞
Syu, Jie-Cheng
論文名稱： Mg-1Ca-0.5Zr合金機械性質與表面腐蝕機制探討
A Study on Mechanical Properties and Surface Corrosion Mechanism of Mg-1Ca-0.5Zr Alloy
指導教授： 洪飛義
Hung, Fei-Yi
呂傳盛
Lui, Truan-Sheng
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 中文
論文頁數： 79
中文關鍵詞： Mg-Ca-Zr 、機械性質 、磨耗 、腐蝕
外文關鍵詞： Mg-Ca-Zr, mechanical properties, erosion, corrosion
相關次數： 點閱：61  下載：0 
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    • 鎂合金作為生醫植入材料具有非常多的優點，例如：其機械性質相較於鈦合金、不鏽鋼等更加接近骨骼。此外，鎂合金在人體內可進行降解，植入物不需進行二次開刀取出，減輕病人的痛苦以及負擔，而且鎂合金降解所產生的鎂離子也能幫助骨骼的生成，加速患部的恢復。現今所使用的鎂鋁鋅合金，生醫相關研究指出鋁具有神經毒性，因此本研究添加鈣以及鋯強化鎂合金的機械性質與抗腐蝕性，研製Mg-1Ca-0.5Zr合金並探討其機械性質與表面腐蝕機制。
    本研究選用擠型鎂鈣鋯合金以400℃進行均質化處理，並解析材料不同方向的機械強度，利用拉伸測試、破壞韌性以及沖蝕磨耗測試進行機械性質分析。為了提高細胞的附著性，導入顆粒沖蝕表面磨耗試驗檢討熱處理材與粗化處理材之表面抗腐蝕機制。
    實驗結果顯示，均質化處理能有效提升材料延性，材料在垂直擠型方向拉伸具有較高的強度，但是延性較低。破壞韌性也顯示垂直擠型方向的破壞特徵主要為脆性主導的沿晶破壞。顆粒沖蝕磨耗測試顯示均質後之鎂鈣鋯合金硬度下降且延性上升，使得最大磨耗率角度往低沖蝕角度偏移。
    均質化處理基地中第二相較均勻分布，可降低材料表面的腐蝕電位差並有效提高抗腐蝕性。經過粗化處理，因表面積提高，腐蝕速率明顯上升。再者，粗化表面因為較不平整，由極化曲線確認不會形成鈍化層。
    浸泡實驗顯示粗化處理可提高表面積，加上材料表面孔洞生成而加速孔蝕發生，導致材料腐蝕速率提升，並在材料表面生成大量氫氧化鎂。此外，在平滑表面可以觀察到磷酸鈣層貼附，該磷酸鈣層具有降低鎂合金腐蝕速率功效。

    Magnesium alloys as a biomaterial is very outstanding. Magnesium mechanical properties is close to nature bones, besides it is biodegradable in human body. Currently, the studies are mainly focus on Mg-Al-Zn alloys. However, researches shows that Al element can cause nerve toxicity. Calcium is one of major elements in bones and zirconium is very powerful grain refinement. Hence, we develop Mg-1Ca-0.5Zr alloy for biodegradable biomaterial, and study mechanical properties and surface corrosion mechanism.
    The result shows that after heat treatment second phase distribute evenly. Tensile test shows that after heat treatment can increase ductility. ED shows better ductility than TD because fiber texture and extrusion characteristic. Electrochemistry test shows that H has lowest corrosion rate with F and pure magnesium. H produce calcium phosphate layer after immersion in SBF, it can protect Mg form corrosion. Study shows that surface roughen is harmful to corrosion resistance. Surface roughen cause a lot hole on surface it will promote pitting corrosion.

    中文摘要 I Abstract III 致謝 XI 總目錄 XII 表目錄 XV 圖目錄 XVI 第一章 前言 1 第二章 文獻回顧 2 2-1 金屬生醫材料 2 2-2 鎂生醫材料優點 3 2-3 鎂生醫材料缺點 5 2-4 鎂合金分類記號規範及意義 6 2-5 鎂合金之元素添加效應 6 2-5-1 鈣添加在鎂基之效益 7 2-5-2 鋯添加在鎂基之效益 8 2-6 破壞力學 9 2-7 表面磨耗與粗化 10 2-7-1 沖蝕磨耗定義 10 2-7-2 顆粒沖蝕角度對材料沖蝕磨耗行為之影響 11 2-7-3 表面粗化 11 2-8 研究目的 12 第三章 實驗步驟與方法 22 3-1 實驗架構 22 3-2 材料製備 22 3-3 微觀組織觀察 23 3-4 X光繞射光譜分析 23 3-5 拉伸試驗與破斷面觀察 24 3-6 破壞韌性試驗 24 3-7 顆粒沖蝕磨耗與表面粗化機制 25 3-7-1 沖蝕磨耗試驗 25 3-7-2 表面粗化處理 25 3-7-3 沖蝕表面與次表面觀察 26 3-8 動電位極化曲線測試 26 3-8-1 試片處理 26 3-8-2 模擬體液 26 3-8-3 動電位極化曲線測試 27 3-9 模擬體液浸泡腐蝕測試 28 3-9-1 浸泡腐蝕失重量測試 28 第四章 結果與討論 34 4-1 微觀組織觀察 34 4-1-1 金相分析 34 4-1-2 基地與晶出相分析 34 4-2 X光繞射光譜分析 35 4-3 熱處理對XK105拉伸性質之影響與破斷面觀察 35 4-4 破壞韌性試驗 36 4-5 沖蝕磨耗特性與表面粗化機制 37 4-5-1 沖蝕磨耗與顆粒材料及沖蝕角度之關係 37 4-5-2 沖蝕磨耗表面與次表面觀察 38 4-6 動電位極化曲線試驗 38 4-7 浸泡測試 40 4-7-1 試片腐蝕速率 40 4-7-2 腐蝕表面形貌及元素分析 40 第五章 結論 72 參考文獻 74

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