臺灣博碩士論文加值系統

微弧氧化是一種電化學表面處理製程，可在金屬表面生成氧化層。和傳統陽極處理之間的差異在於所施加高電場高於陽極氧化層被擊穿的臨界電場。該製程已廣泛用於在鋁合金表面生成厚的氧化層以防止磨損及腐蝕。
本研究主要在探討在電解液中添加石墨、奈米鑽石顆粒對鋁合金表面生成的氧化膜結構及熱阻之影響。實驗中採用6061鋁合金做為基材，以脈衝直流電源供應方式生成氧化物。結果顯示電解液中添加石墨所生成之膜層主要含Al4C3、Al4O4C及Al2O3等相，使得熱輻射率顯著提高，因此可降低膜層之擴散熱阻。電解液中添加奈米鑽石生成之膜層含鑽石Al2OC及Al2O3等相，其擴散熱阻可獲顯著提升，主要可歸因於膜層中含有高熱傳導之鑽石顆粒所致。

Microarc oxidation (MAO) is an electrochemical surface treatment process for generating oxide coatings on metals. It involves the modification of a conventional anodically grown oxide film by the application of an electric field greater than the dielectric breakdown field for the oxide. This process has been widely used to grow thick oxide layer on aluminum which can offer protection against wear and corrosion.
This study investigates the effects of adding graphite and nano-diamond powders into the electrolyte solution on structure and thermal properties of grown aluminum oxides by MAO process. The 6061 aluminum alloy was used as the substrate material and pulsed DC power supply was utilized to grow oxide layer. The results show that Al4C3, Al4O4C and Al2O3 are the main phases in grown layer when graphite particles are added into the electrolyte solution. The addition of graphite particles into the electrolyte solution significantly increases the thermal emissivity and hence decreases the heat spreading resistance of the grown layers. In the case of using nano-diamond particles as the additives, only diamond, Al2OC and Al2O3 phases are observed in the grown layer. The measured heat spreading resistance decreased obviously, which can be attributed to the high thermal conductivity of diamond particles trapped inside the coatings.

摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章前言 1
1-1緒論 1
1-2微弧氧化應用 3
1-3 研究目的 3
第二章 文獻回顧 5
2-1微弧氧化法進展 5
2-2 微弧氧化法(Microarc Oxidation Technique)原理 6
2-2-1 電解液對膜層之影響 8
2-2-2電源總類對膜層影響 9
2-2-2-1電源種類 9
2-3參數對膜層之影響 11
2-4 電流與電壓對微弧氧化之影響 11
2-5微弧氧化時間對於膜層顯微組織之影響 12
2-6 添加劑對微弧氧化之工件之影響 14
2-7奈米鑽石 14
2-8 石墨 15
2-9 MAO法處理後之工件特性 17
第三章 實驗設備與步驟 19
3-1 材料及藥品準備： 19
3-1-1 實驗機台 20
3-2 實驗流程 20
3-2-1試片前處理 22
3-3 實驗步驟 22
3-2-3 脈衝參數 22
3-3膜層分析 24
3-3-1電子顯微鏡分析 24
3-3-2成分分析 25
3-3-3 XRD分析 26
3-3-4熱輻射分析 26
第四章 結果與討論 28
4.1 氧化膜的表面觀察 28
4-1-1無添加劑對表面之影響 28
4-2 添加奈米鑽石對表面之影響 31
4-2-1二次微弧對奈米鑽石之影響 37
39
4-3添加石墨之微結構之影響 40
4-3-1 熱阻、熱輻射及熱傳導分析 47
第五章 結論 51

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