鋁、鎂合金熱成長氧化膜之微結構與熱反應

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劉俊伯(Jyun-Bo Liu) 查詢紙本館藏

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機械工程學系

論文名稱

鋁、鎂合金熱成長氧化膜之微結構與熱反應

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摘要(中)

本研究主要在探討鋁與鎂合金熱成長氧化膜的分析，使用的材料有純鋁(99.999%)、鋁錠(99.82%)、純鎂(99.956%)、鎂合金AZ80四種。試片裁切成10 mm × 10 mm × 6 mm的大小，使用400號、800號、1200號、1500號跟2000號砂紙將表面乾磨，然後放在加熱爐中加熱到610℃、427℃，持溫1小時、25小時以生長氧化膜。
實驗結果發現氧化膜中有通道/微通道的結構，通道是因為材料中particle所造成的，可以在鋁錠的試片上利用顯微鏡觀察到。而鋁的微通道是因為非均質氧化膜轉換成均質氧化膜所造成的，同時也形成白點特徵。而鎂合金試片只有觀察到微通道，這是因為鎂蒸氣壓大的關係，所以通道的部分後來就因為鎂的擴散而變為微通道。
另外若再加熱長膜的時候使用保護性氣體SF6，在純鎂試片的氧化膜中可以發現到具有保護作用的MgF2層與少量的MgS，其為使鎂合金在熔化及鑄造時減少燃燒趨勢的原因。

摘要(英)

The purpose of this study is analyzing the thermal-formed oxide on aluminum and magnesium alloys. Four materials, pure aluminum (99.999 wt.%), aluminum ingot (99.82 wt.%), pure magnesium (99.956 wt.%), and magnesium alloy AZ80 were used in this study. The cube samples were prepared in 10 mm × 10 mm × 6 mm. They were then polished by ＃400, ＃800, ＃1200, ＃1500 and ＃2000 abrasive paper. These cube samples were moved to the muffle furnace and then heated to 610℃, 427℃ and hold on for 1 hr, 25hrs.
There are pore/micro-pore structures in the oxide film from the result of experimental. The pores are caused from the particle in the matrix. They are saw in aluminum samples using optical microscope. And the micro-pores of aluminum are caused from the transformation of amorphous oxide film to non-amorphous oxide film, the white dots characters formed at the same time. There are only micro-pores in the magnesium alloys samples. Because the high vapor pressure of magnesium, magnesium diffusion to pore to form oxide and pores become micro-pore.
There are protective layer MgF2 and a little MgS if we use protective gas SF6 during producing pure magnesium oxide film. This layer is the cause of reducing magnesium alloys burring tendency in melting and casting.

關鍵字(中)

★ 熱成長氧化膜
★ 乾磨
★ 通道
★ 微通道

關鍵字(英)

★ thermal oxide film
★ micro-pore
★ pore
★ dry ground

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 鋁合金的簡述…………………………………………………………… 2
2.1.1 鋁合金的類型……………………………………………………… 2
2.1.2 鑄造用鋁合金的分類……………………………………………… 2
2.1.3 純鋁(1XX.X)………………………………………………………… 3
2.1.4 影響熔湯表面張力的元素………………………………………… 3
2.2 氧化鋁的生成…………………………………………………………… 3
2.2.1 氧化鋁的種類……………………………………………………… 3
2.2.2 氧化鋁的形成……………………………………………………… 5
2.2.3 化學分析電子儀(ESCA)診斷氧化鋁膜…………………………… 7
2.3 鎂合金材料簡介………………………………………………………… 7
2.3.1 鎂資源及其製造…………………………………………………… 8
2.3.2 鎂合金材料特性…………………………………………………… 8
2.3.3 鎂合金的分類……………………………………………………… 9
2.3.4 合金元素的影響…………………………………………………… 10
第三章實驗方法與步驟……………………………………………………… 13
3.1 實驗目的………………………………………………………………… 13
3.2 實驗材料………………………………………………………………… 13
3.2.1 純鋁材料…………………………………………………………… 13
3.2.2 純鎂材料…………………………………………………………… 13
3.2.3 鎂鋁合金…………………………………………………………… 13
3.3 試片規格………………………………………………………………… 13
3.4 實驗設備………………………………………………………………… 14
3.5 實驗步驟………………………………………………………………… 15
3.5.1 氧化膜生長………………………………………………………… 15
3.5.2 固溶處理…………………………………………………………… 15
第四章結果與討論…………………………………………………………… 16
4.1 鋁氧化膜………………………………………………………………… 16
4.1.1 試片表面處理……………………………………………………… 16
4.1.2 掃描式電子顯微鏡(SEM)的觀察………………………………… 18
4.1.3 化學分析電子儀(ESCA)的檢測…………………………………… 18
4.1.4 電子探針微分析儀(EPMA)的檢測………………………………… 19
4.1.5 鋁氧化膜討論……………………………………………………… 19
4.2 鎂氧化膜………………………………………………………………… 20
4.2.1 試片表面處理……………………………………………………… 20
4.2.2 掃描式電子顯微鏡(SEM)的觀察………………………………… 20
4.2.3 化學分析電子儀(ESCA)的檢測…………………………………… 21
4.2.4 電子探針微分析儀(EPMA)的檢測………………………………… 21
4.2.5 鎂氧化膜討論……………………………………………………… 22
4.3 使用保護性氣體SF6的鎂氧化膜……………………………………… 22
4.3.1 試片表面處理……………………………………………………… 22
4.3.2電子探針微分析儀(EPMA)的檢測………………………………… 23
4.3.3使用保護性氣體SF6的鎂氧化膜討論……………………………… 23
4.4 鎂合金AZ80氧化膜…………………………………………………… 24
4.4.1 試片表面處理……………………………………………………… 24
4.4.2 掃描式電子顯微鏡(SEM)的觀察………………………………… 24
4.4.3 化學分析電子儀(ESCA)的檢測…………………………………… 25
4.4.4 電子探針微分析儀(EPMA)的檢測………………………………… 25
4.4.5鎂合金AZ80氧化膜討論…………………………………………… 25
4.5 鎂合金Mg-9Al-0.5Zn-0.3Be氧化膜(文獻)…………………………… 26
4.5.1 試片準備……………………………………………………………26
4.5.2化學分析電子儀(ESCA)的檢測…………………………………… 26
4.5.3鎂合金Mg-9Al-0.5Zn-0.3Be氧化膜討論………………………… 26
4.6 綜論………………………………………………………………………27
第五章結論…………………………………………………………………… 28
參考文獻…………………………………………………………………………29
附錄………………………………………………………………………………91

參考文獻

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指導教授

施登士(Teng-Shih Shih)

審核日期

2005-7-22

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