鋯基金屬玻璃薄膜對鎂基塊狀金屬玻璃複材之機械性質與抗腐蝕性提升之研究

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李重毅(Chung-I Lee) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

鋯基金屬玻璃薄膜對鎂基塊狀金屬玻璃複材之機械性質與抗腐蝕性提升之研究
(Improvement of Mechanical Properties and Corrosion Resistance of Mg-based Bulk Metallic Glass Composite by coating Zr-based Metallic Glass Thin Film)

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摘要(中)

鎂合金擁有低的密度以及較高的比強度的優點，但是，其低剛性、加工性差以及較低的抗腐蝕性，造成應用受到限制。本研究選用Mg58Cu31Gd11為基材，利用外添加25 vol.% 的多孔鉬顆粒製成鎂基複材，將鋯基((Zr53Cu30Ni9Al8)99.5Si0.5)金屬玻璃薄膜鍍覆在鎂基複材表面來改善機械性質與抗腐蝕性，並利用三點彎曲進行抗彎強度提升之探討。分別以鋁-鈦(25 nm / 25 nm)與銅(50 nm)作為基材與鍍膜間的緩衝層，根據膠帶附著力測試結果顯示，以鋁-鈦為緩衝層所鍍覆之鋯基金屬玻璃薄膜之附著力(4 B)優於以銅為緩衝層的薄膜之附著力(0 B)。鎂基塊狀金屬玻璃基材與複材於抗彎試驗後，可觀察到多孔鉬顆粒於鎂基塊狀金屬玻璃複材內，可以有效的阻擋裂縫的傳播以及吸收掉裂縫的能量，促使複材的抗彎強度有效提升至180 MPa，且鍍覆鋯基金屬玻璃薄膜的鎂基塊狀金屬玻璃複材抗彎強度更可提高到了254 MPa。由此推論，鋯基金屬玻璃薄膜能有效地覆蓋試片表面的缺陷以及抑制試片表面第一個裂縫的產生，進而提升抗彎強度。另外透過電化學腐蝕試驗(動態極化曲線)得到鍍覆鋯基金屬玻璃薄膜之鎂基塊狀金屬玻璃複材的腐蝕電流密度為9.16x10-8 A/mm2，而鎂基塊狀金屬玻璃基材與複材分別為8.69x10-7 A/mm2與5.65x10-6 A/mm2。因此，由電化學腐蝕試驗的結果可看出鋯基金屬玻璃薄膜可以提供保護鎂基塊狀金屬玻璃複材更優越的耐腐蝕性。

摘要(英)

In order to improve the mechanical properties as well as corrosion resistance of Mg-based metallic glass (BMG) and Mg-based metallic glass composite (BMGC). The Zr-based metallic glass thin film (MGTF) of 200 nm thickness was coated on the Mg-based BMGC with two different buffer layers, Al-Ti (25 nm/25 nm) and Cu(50 nm), for adhesion ability investigation. The BMGC plates (with dimension of 4 mm W x 3 mm T x 35 mm L) of Mg58Cu31Gd11 with 25 vol.% Mo particles (size of 25 m) [2] was selected as the substrate and coated with 200 nm Zr-based ((Zr53Cu30Ni9Al8)99.5Si0.5) MGTF by DC-sputtering. The results of 3-point bending test show that the flexural strength of the Mg-based BMGC (180 MPa) can be significantly enhanced to 254 MPa for the Mg-based BMGC with 200 nm Zr-based MGTF coating. The remarkable increase in flexural strength of the Mg-based BMGC coated with Zr-based MGTF is suggested that the Zr-based MGTF can smooth the surface (by covering the defects on the specimen surface) to prevent the stress concentration and also provide residual stress to suppress the crack initiation from the specimen surface during bending test. In addition, the results of polarization electrochemical test reveal that the Zr-based MGTF exhibits much better corrosion resistance in 0.9 wt. % sodium chloride solution. Accordingly, the coating of 200 nm Zr-based MGTF on the Mg-based BMGC by sputtering is believed a promising method to protect the Mg-based BMGC from the island environment.

關鍵字(中)

★ 鎂基塊狀金屬玻璃複材
★ 鋯基金屬玻璃薄膜
★ 三點抗彎
★ 抗腐蝕

關鍵字(英)

論文目次

中文摘要 I
Abstract II
致謝 III
總目錄 V
表目錄 X
圖目錄 XI
第一章前言 1
1-1 緒論 1
1-2 研究動機與目的 2
第二章理論基礎 4
2-1 非晶質合金概述 4
2-2 非晶質合金發展歷程 5
2-3 實驗歸納法則 8
2-3-1 金屬玻璃成型法則 8
2-3-2 外加延性金屬顆粒選擇法 10
2-4 非晶質合金熱力學 11
2-4-1 玻璃轉化溫度(glass transition temperature, Tg) 12
2-4-2 結晶溫度(crystallization temperature, Tx) 12
2-4-3 玻璃形成能力(Glass Forming Ability, GFA) 13
2-5 非晶質合金的特性與應用 14
2-5-1 機械性質 15
2-5-2 耐腐蝕性 16
2-5-3 磁性質 16
2-5-4 其他性質 17
2-5-5 金屬玻璃應用 17
2-6 非晶質合金之製程簡介 18
2-7 金屬玻璃薄膜 21
2-7-1 濺鍍法製作金屬玻璃薄膜(sputtering) [44] 21
2-7-2 金屬玻璃薄膜之抗菌性 23
2-7-3 金屬玻璃薄膜應用於醫療用具 23
2-7-4 金屬玻璃薄膜提升疲勞性質 23
2-7-5 金屬玻璃薄膜改善抗彎性質 24
2-8 彎曲破壞[48] 24
2-9 電化學腐蝕[50] 25
第三章實驗方法與步驟 39
3-1 鎂基塊狀金屬玻璃基材與複材之製備 40
3-1-1 成份配置 40
3-1-2 真空電弧融煉 40
3-1-3 傾倒式真空感應熔煉法 41
3-1-4 噴鑄式真空感應熔煉法 42
3-1-5 抗彎試片製作 42
3-1-6 腐蝕試片製作 43
3-2 鎂基塊狀金屬玻璃基材與複材之基礎性質分析 43
3-2-1 X光繞射結構分析 43
3-2-2 熱性質分析 43
3-2-3 機械性質分析 44
3-3 鋯基靶材之製備 44
3-3-1 成份配置 44
3-3-2 真空電弧熔煉 45
3-3-3 墜落式鑄造成型 45
3-4 鋯基金屬玻璃薄膜製備 46
3-4-1 金屬玻璃薄膜腐蝕試片製作 46
3-5 金屬玻璃薄膜之基礎性質分析 47
3-5-1 低掠角X光繞射分析 47
3-5-2 附著力測試 47
3-5-3 奈米壓痕測試 47
3-6 利用三點彎曲試驗(3-point bending)進行機械性質分析 48
3-7 微觀結構分析 49
3-7-1 原子力顯微鏡分析 49
3-7-2 掃描式電子顯微鏡、能量散佈光譜儀分析 50
3-7-3 穿透式電子顯微鏡分析 50
3-8 電化學腐蝕試驗(動態極化) 51
第四章實驗結果 67
4-1 鎂基塊狀金屬玻璃基材與複材之基礎性質分析 67
4-1-1 成份分析 67
4-1-2 鎂基塊狀金屬玻璃基材、複材結構分析 67
4-1-3 熱性質分析 68
4-1-4 多孔鉬顆粒散佈分析 69
4-1-5 鎂基塊狀金屬玻璃基材與複材之硬度與楊氏模數 70
4-2 鋯基金屬玻璃薄膜之基礎性質分析 70
4-2-1 成份分析 70
4-2-2 金屬玻璃薄膜結構分析 71
4-2-3 金屬玻璃薄膜附著力 71
4-2-4 金屬玻璃薄膜厚度觀察 71
4-2-5 金屬玻璃薄膜之硬度與楊氏模數 72
4-3 AFM表面粗糙度分析 72
4-4 三點彎曲試驗 73
4-5 彎曲破壞試片之觀察 74
4-5-1 SEM-破斷面觀察 (cross-section view) 74
4-5-2 SEM-俯視圖觀察 (Top View) 75
4-5-3 TEM觀察 77
4-6 電化學腐蝕試驗 77
第五章結論 99
第六章參考文獻 101

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指導教授

鄭憲清(Shian-Ching Jang)

審核日期

2016-7-26

推文