在不同氣氛下Al-6Zn-XMg(X=0,2wt%)熱合氧化膜的成長機制

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陳諄修(Juen-shiou Chen) 查詢紙本館藏

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機械工程學系

論文名稱

在不同氣氛下Al-6Zn-XMg(X=0,2wt%)熱合氧化膜的成長機制
(Thermally formed oxide films on Al-6Zn-XMg(X=0,2wt%) alloys heated in different gases)

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摘要(中)

本研究主要探討Al-6Zn和Al-6Zn-2Mg合金試片的熱成長氧化膜分析，目的在於了解鋅對鋁合金氧化膜的影響，所以採用仿7系列鋁合金成份來研究，實驗利用乾磨的方式將試片研磨至P2000號砂紙，在空氣和氮氣氣氛下，將試片置於加熱爐內500℃持溫後觀察氧化膜的相變化。使用熱重分析儀(TGA)來量測試片氧化膜重量的改變，再用低掠角X-ray判定氧化膜可能的化合物，以及SEM、ESCA、EPMA等儀器分析。
從實驗結果得知Al-6Zn合金在空氣氣氛中的氧化膜表層以致密的γ氧化鋁為主，內層的γ氧化鋁則和鋅反應形成Zn spinel，並且有鋅顆粒散佈在氧化膜上面。Al-6Zn-2Mg合金當中鎂的氧化物自由能比鋁氧化物還低，所以表面為氧化鎂和Mg spinel組成的氧化物為主並且結構較為鬆散，而γ氧化鋁位於鎂氧化層和基材之間，以及有鋅顆粒在表面的散佈。
在氮氣氣氛當中，鋅原子不容易形成氮化鋅，所以Al-6Zn氮氣中的試片以AlN以及因表面吸附的氧與基材的鋁反應形成的γ氧化鋁為主，而Al-6Zn-2Mg氮氣中的試片表面主要為鋁和鎂的氮化物，產生的Mg3N2化合物會與基材中的鋁反應持續產生AlN造成重量的改變。

摘要(英)

The purpose of this study is analyzing the thermal-formed oxide on aluminum alloys and effect of Zinc in the oxide film. Two materials, Al-6Zn、Al-6Zn-2Mg were used in this study. All surface of the sample were dry polished by SiC paper from P400 to P2000. The sample were set in quartz furnace then heated at 773K for different time spans in dry air and nitrogen gas. Thermo-gravimetric analysis was used to measure the weight change of oxide film. Samples were discussed according to XRD、SEM、ESCA、EPMA analysis.
Experimental result show that the oxide film of Al-6Zn alloy comprised γ-alumina in top layer and Zn spinel in inter layer. The γ-alumina reacted with Zinc transformed to Zn spinel .There are metallic Zinc on the Al-6Zn sample oxide film surface. The main consists of Al-6Zn-2Mg oxide film were magnesium oxide and Mg spinel, because of magnesium oxide Gibbs-free energy lower than the alumina. Magnesium oxide film possessed of loose structures. The alumina located at region near the interface between magnesium oxide film and substrate. This sample have metallic Zinc in oxide film too.
Because of the Zinc is difficult to form Zinc nitride in the nitrogen gas, so that Al-6Zn sample weight change is due to the formation of AlN and γ-alumina. Al-6Zn-2Mg sample surface was formed by aluminum nitride and magnesium nitride in the nitrogen gas, Mg3N2 contact with substrate Al and form AlN, and this chain reaction will cause the sample weight change.

關鍵字(中)

★ 熱合氧化膜
★ γ氧化鋁
★ 氮化鋁

關鍵字(英)

★ AlN
★ γ-alumina
★ Oxide film

論文目次

中文摘要 I
英文摘要 II
總目錄 III
表目錄 VI
圖目錄 VII
第一章前言 1
第二章文獻回顧 2
2-1 鋁合金介紹 2
2-1-1 鋁合金簡述 2
2-1-2 鋁合金的分類 2
2-2 純鋁及氧化鋁介紹 3
2-2-1 純鋁(1XXX)材料特性 3
2-2-2 氧化鋁的種類 3
2-2-3 氧化鋁的形成 4
2-3 鋁鎂合金及其氧化物介紹 5
2-3-1鋁鎂合金(5XXX)材料特性 5
2-3-2 鎂元素對鋁合金的影響 5
2-3-3鎂尖晶石 5
2-4 鋁鋅、鋁鋅鎂合金及其氧化物介紹 6
2-4-1 鋁鋅鎂合金(7XXX)材料的特性 6
2-4-2 鋅元素對鋁合金的影響 6
2-4-3 氧化鋅 7
2-4-4 鋅尖晶石 8
2-5 氮氣中的鋁合金 8
2-5-1 氮化鋁的特性和結構 8
2-5-2 氮化鋁的形成 9
2-5-3 氮氣和氧氣的表面吸附情形 9
第三章實驗方法與步驟 10
3.1 實驗目的 10
3.2 實驗材料 10
3.3 實驗試片規格 10
3.4 實驗設備 10
3.5 實驗步驟 12
3.5.1 固溶處理 12
3.5.2 熱合氧化膜的成長 12
第四章結果與討論 13
4.1 Al-6Zn試片空氣氣氛之氧化膜 …13
4.1.1 Al-6Zn試片固溶和表面處理 13
4.1.2 掃描式電子顯微鏡(SEM)觀察 13
4.1.3 Al-6Zn試片熱重分析儀(TGA)檢測 13
4.1.4 Al-6Zn試片X光繞射分析儀(XRD)檢測 14
4.1.5 Al-6Zn試片電子探針微分析儀(EPMA)的檢測 15
4.1.6 Al-6Zn試片化學分析電子儀(ESCA)檢測 15
4.2 Al-6Zn-2Mg試片空氣氣氛之氧化膜 15
4.2.1 Al-6Zn-2Mg試片固溶處理和表面處理 15
4.2.2 掃描式電子顯微鏡(SEM)觀察 16
4.2.3 Al-6Zn-2Mg試片熱重分析儀(TGA)檢測 16
4.2.4 Al-6Zn-2Mg X光繞射分析儀(XRD)檢測 17
4.2.5 Al-6Zn-2Mg試片電子探針微分析儀(EPMA)的檢測 17
4.2.6 Al-6Zn-2Mg試片化學分析電子儀(ESCA)檢測 17
4.3 Al-6Zn試片氮氣氣氛之氧化膜 18
4.3.1 Al-6Zn試片表面處理 18
4.3.2 Al-6Zn試片氮氣氣氛熱重分析儀(TGA)檢測 18
4.3.3 Al-6Zn X光繞射分析儀(XRD)檢測 18
4.4 Al-6Zn-2Mg試片氮氣氣氛之氧化膜 19
4.4.1 Al-6Zn-2Mg試片表面處理 19
4.4.2 Al-6Zn-2Mg試片氮氣氣氛熱重分析儀(TGA)檢測 19
4.4.3 Al-6Zn-2Mg X光繞射分析儀(XRD)檢測 20
4.5 綜論 20
第五章結論 21
參考文獻 22

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指導教授

施登士(Teng-shih Shih)

審核日期

2008-7-24

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