球狀鐵顆粒添加對鎂鋅鈣金屬玻璃機械性質改善之研究

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施博錕(Po-Kun Shih) 查詢紙本館藏

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機械工程學系

論文名稱

球狀鐵顆粒添加對鎂鋅鈣金屬玻璃機械性質改善之研究
(The Improvement of Mechanical Properties of Mg-based Metallic Glass with Ex-situ Adding Spherical Iron Particles)

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摘要(中)

隨著醫療水平的日益提升，具有生物降解特性之植入材料備受醫學器材界關注，因為其擁有能夠在生物體內自主分解，免除二次手術取出造成術後感染的風險。鎂、鋅、鈣為人體內含量極高之金屬元素，將其製造形成非晶質之鎂基金屬玻璃，不但具有良好的生物相容性，同時具有貼近骨骼之楊氏係數，非常適合骨科植入器材方面的應用。然而，鎂鋅鈣金屬玻璃在常溫下呈現出嚴重脆性，尚待克服。本研究選用該系統中擁有相對優異的玻璃形成能力之Mg66Zn29Ca5為基材，添加球狀次μm級之鐵顆粒製作出金屬玻璃複材。實驗結果得知，在添加低體積分率鐵顆粒可有效提升金屬玻璃之壓縮破裂強度，複材抗壓強度可達到853 MPa，但由於細小尺寸之球狀鐵顆粒容易形成部分團聚，影響鐵顆粒球體與基材介面結合度，以致於強化顆粒無法很有效地阻擋Shear band 的傳播，因此其塑性變形量並沒有顯著提升。

摘要(英)

With the increasing level of medical care, the biodegradable property of the implant material has been concerned by the medical equipment sector because of its self-degradability which can avoid the risk of secondary surgery to remove the implant and postoperative infection. Since magnesium, zinc and calcium are metal elements with high content in the human body. Therefore, the Mg-based bulk amorphous alloy (BAA) made of Mg, Zn, and Ca elements will have the advantages not only good biocompatibility, but also lower Young′s modulus close to human bone, and very suitable for the applications on orthopedic implants. However, Mg-Zn-Ca amorphous alloy shows severe brittleness at room temperature and need to be overcome. In this study, Mg66Zn29Ca5 with relatively good glass forming ability was selected as the base alloy and ex-situ added sub-micrometer-sized spherical iron particles to form the Mg-based amorphous alloy composites (BAAC). The experimental results show that adding low volume fraction of Fe particles can effectively improve the compression and fracture strength of Mg-based BAA, and the maximum compressive strength of the composite can reach to 853 MPa. However, the sub-micrometer-sized spherical iron particles are very easy to agglomerate and affect the interface adhesion between the particles and amorphous matrix. So that, the sub-micrometer-sized Fe particles cannot effectively restrict the propagation of shear band and distinctly improve the plasticity of MgZnCa-based BAA.

關鍵字(中)

★ 球狀鐵顆粒
★ 骨科植入器材
★ 生物降解
★ 金屬玻璃

關鍵字(英)

★ spherical iron particles
★ orthopedic implants
★ biodegradable
★ Metallic Glass

論文目次

總目錄
中文摘要I
英文摘要II
總目錄III
表目錄VII
圖目錄VIII
第一章　前言1
1-1　緒論1
　1-2　研究動機與目的3
第二章　理論基礎5
2-1　金屬玻璃概述5
2-2 金屬玻璃的發展歷程6
2-3 實驗歸納法則9
2-4　金屬玻璃製造方式10
2-5 金屬玻璃熱力學12
2-5-1　非晶質屬於平衡的介穩態13
2-5-2 玻璃轉換溫度(Tg)13
2-5-3　簡化玻璃溫度(Trg)14
2-5-4 過冷液相區大小(ΔTx)15
2-5-5 γ與γm15
　2-6　金屬玻璃之特性16
2-6-1　機械性質17
　　2-6-2　耐蝕性17
2-6-3　制菌性18
2-6-4　磁性質18
　2-7　金屬玻璃內部變形機制19
2-8　添加金屬顆粒之選擇法則20
第三章　實驗步驟21
3-1　試片製作21
3-1-1　合金基材與複材配製21
　　3-1-2　合金基材熔煉22
3-1-3　合金複材熔煉23
3-1-4　金屬玻璃棒材製作23
3-2　微結構觀察與分析25
3-2-1　X光繞射分析(XRD)25
3-2-2　掃描式電子顯微鏡(SEM)觀察及能量散射質譜分析(EDS)25
3-2-3 穿透式電子顯微鏡(TEM)26
3-3　熱性質分析26
　3-4　機械性質分析27
3-4-1 硬度分析27
3-4-2 破裂韌性28
3-4-3 壓縮測試30
第四章　結果與討論33
4-1　顯微組織觀察與分析33
4-1-1 X光繞射分析33
4-1-2 壓縮前試片之SEM觀察與EDS成份分析34
4-1-3 穿透式電子顯微鏡TEM觀察分析35
4-1-4 外加顆粒實際含量計算36
4-2 熱性質分析37
4-2-1 基材非恆溫熱性質分析37
4-2-2 複材非恆溫熱性質分析37
4-2-3 複材非晶態殘留比率計算38
4-3 機械性質分析38
4-3-1 硬度測試39
4-3-2 破裂韌性測試結果與分析39
4-3-3 壓縮測試結果與分析41
4-3-4 壓縮後試片破斷面之SEM觀察42
第五章　結論45
參考文獻46

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2017-8-16

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