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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2524


    Title: 鋁、鎂合金熱成長氧化膜之微結構與熱反應
    Authors: 劉俊伯;Jyun-Bo Liu
    Contributors: 機械工程研究所
    Keywords: 熱成長氧化膜;乾磨;通道;微通道;thermal oxide film;micro-pore;pore;dry ground
    Date: 2005-07-08
    Issue Date: 2009-09-21 11:49:20 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 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。 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.
    Appears in Collections:[機械工程研究所] 博碩士論文

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