臺灣博碩士論文加值系統

氮化鋁 (AlN) 容易發生水解反應，但因生成產物層，使擴散阻力上升，導致水解速率逐漸緩慢而難以完全水解。因此，本研究以微波輔助加速氮化鋁水解，利用微波不須經由容器傳遞，且可透過分子之極化進行加熱之特性，降低熱傳導過程中的能量散失，提昇加熱的效率，縮短反應所需的時間。實驗探討反應溫度 (25, 45, 70, 90℃)、反應時間 (0~129 min) 與微波功率 (0, 50, 150 W) 對氮化鋁粉末水解之影響。
實驗結果顯示: AlN (2 µm) 粉末之水解，分別以平板加熱器、微波50 W與微波 150 W 加熱，在反應初期 (8 min) 時，因微波 150 W 加熱速率較快，AlN 轉化率達 73.0%，明顯較另外兩者為高 (AlN 轉化率 18.2%~20.1%)；當溫度上升至 90℃後，且反應達末期 (129 min) 時，三種加熱方法之 AlN 轉化率即趨於相近。XRD圖顯示以微波輔助水解，無論反應初期還是接近完全水解之產物晶相均為氫氧化鋁 AlOOH (boehmite)，與直接加熱水解主要生成 Al(OH)3 並不相同。SEM 圖亦顯示 AlN 粉體外觀以鱗片狀的 AlOOH 為主。

Aluminum nitride (AlN) can be easily hydrolyzed. However, the product layer increases the diffusion resistance, resulting to the decrease of hydrolysis rate. In this study, the microwave-assisted hydrolysis method was proposed for the rapid hydrolysis of AlN due to the energy transfer of microwave via the molecule polarization, leading to the reduction of the energy loss in the heat conduction process. Moreover, the effects of experimental parameters, including reaction temperature (25, 45, 70, 90 ℃), reaction time (0-129 min), and applied power (0, 50, 150 W) on the hydrolysis efficiency, were also discussed.
The heating methods for AlN (2 μm) hydrolysis process were by flat heater, and microwave energy applied at 150 W or 50 W. The results showed that in the induction period (reaction time = 8 min), due to the rapid heating by microwave at 150 W, the conversion of AIN reached 73.0%, much higher than that by microwave at 50 W or flat heater (AlN conversion was about 18.2-20.1%). When the temperature was at 90℃ with the reaction time = 129 min, the conversion of AIN was consistency for three kinds of heating methods. By XRD patterns, the product of microwave-assisted AlN hydrolysis was mainly AlOOH (boehmite), and was very different with by flat heater (Al(OH)3). SEM photos also showed that the morphology of product was mainly composed by a large amount of lamellas boehmite AlOOH.

摘 要 I
ABSTRACT II
誌 謝 IV
總目錄 V
表目錄 VIII
圖目錄 IX
1-1 研究動機及目的 1
1-2 研究內容 3
第二章 文獻回顧 4
2-1 氮化鋁特性 4
2-1-1 氮化鋁的晶體結構 4
2-1-2 氮化鋁的物理化學特性 5
2-2 氮化鋁的應用 6
2-3 氮化鋁水解 8
2-3-1 氮化鋁水解的反應原理 8
2-3-2 氮化鋁水解產物結晶機制 10
2-3-3 氮化鋁水解的影響因子 10
2-4 液固相反應動力模式 12
2-4-1 流體-固相反應模式 12
2-4-2 縮核模式解析氮化鋁水解的現況 14
2-4-3 縮核模式、轉化率與時間關係式 15
2-4-4 縮核模式修正項 16
2-5 微波的性質 17
2-5-1 微波的原理 17
2-5-2 影響介質吸收微波因素 17
2-5-3 微波機制 20
2-5-4 微波與傳統加熱之差異 22
2-5-5 微波加熱的特點 22
2-5-6 微波在加速水解的應用 23
第三章 實驗設備與方法 24
3-1 實驗設備與材料 24
3-1-1 藥品及材料 24
3-1-2 設備 24
3-2 實驗流程與參數設定 25
3-2-1 氮化鋁水解反應系統 25
3-2-2 實驗流程 27
3-2-2 參數設定 29
3-3 產物分析系統 29
3-4 熱力學參數計算 30
第四章 結果與討論 32
4-1 氮化鋁微波水解之轉化率 32
4-1-1 轉化率之計算 32
4-1-2 溫度及升溫時間對轉化率之影響 34
4-1-3 微波功率對轉化率之影響 37
4-1-4 計算Al(OH)3含量分析 42
4-2 氮化鋁粉末微波水解產物分析 44
4-2-1 晶相分析 44
4-2-2 掃描式電子顯微鏡形貌分析 46
4-3 微波水解對溶液pH值變化之影響 48
第五章 結論與建議 50
5-1 結論 50
5-2 建議 51
參考文獻 52
簡 歷 58

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