臺灣博碩士論文加值系統

微晶粒氧化鋁陶瓷因具備優良的機械性質、化學穩定性、耐高溫、透光性等特性而被廣泛應用，在製備微晶粒氧化鋁陶瓷時，則須考量到原料特性、生坯微結構、燒結過程等因素，尤其生坯的微結構與燒結體的微結構息息相關，若具備高均勻性、高密度之生坯則有利於燒結形成高緻密化、均勻性佳之燒結體，而氧化鋁微晶粒陶瓷體所使用之原料須是次微米級大小以下的氧化鋁粉體，本研究便以次微米級氧化鋁粉體混合奈米級氧化鋁粉體，以 Furnas model 細顆填充於粗顆間的孔隙的概念，以獲得高均勻性、高密度之生坯，以不同粒徑差異、混合比例、混合時間結合注漿成型法來探討對堆積密度的影響。
經由回顧與整理 Furnas model 相關理論以及前人研究成果，了解雙元混合影響堆積密度的因素與機制。在粗細顆相互混合的情況下，粒徑差異須至少相差 7 倍且隨粒徑差異越大越接近理論值，細顆比例佔 25-30 % ，顆粒形狀越接近圓球，粗細顆的粒徑分布中等大小的顆粒越少，顆粒間凝聚的現象越不明顯，則可形成緊密堆積之高密度生坯，但在粒徑差異過大的條件時，也容易導致顆粒分層的現象，形成不均勻的堆積構造。
在實驗成果則是，以平均粒徑 180 nm 混合平均粒徑 20 nm的氧化鋁生坯，在細顆比例佔 25 vol.% ，經 12 小時混合後有最佳之相對密度 80.5 % ，而平均粒徑 420 nm 混合平均粒徑 20nm 的氧化鋁生坯則因粒徑差異較大，粗細顆在漿料注漿後所受流體作用力的大小差異，而形成不均勻的堆積結構，以致於密度下降。

The effect of particle size ratio, mixing ratio, and mixing time on the particle packing of alumina green bodies using binary mixtures of coarse α-Al2O3 powders (average particle size are 420 and 180 nm) and fine θ- Al2O3 powder (average particle size is 20 nm) was investigated. Green bodies were formed by slip casting and the slurries were prepared by mixing two different average particle size dispersed slurries in different particle size ratio (420/20 and 180/20) and mixing ratio (coarse/fine = 87.5/12.5, 75/25 and 50/50) at different mixing time (1h and 12h). The slips after drying would be pre-heated at 800℃ for 1h to eliminate the dispersant and strengthen the green bodies for analyzing. The results show that the green bodies with the highest green density of 80.5% when the particle size ratio was 180/20 and the mixing ratio was 75/25 and the mixing time was 12h. Packing densities increased with increasing mixing time for all mixtures. Increasing the amount of fine alumina powders gave rise to increasing packing density first, then decreasing for more fine alumina powders. In the case of 420/20 green bodies, the particle segregation phenomenon occurred that result in decreasing the packing density and non-homogeneous microstructures.

摘要 I
Abstract II
誌謝 IX
目錄 X
圖目錄 XIII
表目錄 XIX
第一章 緒論 1
1-1前言 1
1-2研究動機 3
1-3研究目的 4
第二章 基礎理論與相關文獻回顧整理 5
2-1 氧化鋁背景陳述 5
2-1-1氧化鋁結晶相 5
2-1-2氧化鋁性質和應用 6
2-2顆粒堆積特性 9
2-2-1單元粒徑顆粒堆積 9
2-2-1-1 粒徑分布的影響 12
2-2-1-2 顆粒形狀的影響 13
2-2-1-3 顆粒間的凝聚 15
2-2-1-4 成形方法的影響 16
2-2-2 雙元粒徑堆積 18
2-2-2-1 粗細顆粒粒徑比的影響 28
2-2-2-2 粗細顆混合比的影響 32
2-2-2-3 顆粒形狀的影響 33
2-2-2-4 粒徑分布的影響 35
2-2-2-5 顆粒間凝聚的影響 41
2-2-2-6 成形方法以及均勻性的影響 42
2-2-2-7 綜合討論 46
2-3注漿成型 47
2-3-1漿料流變行為 48
2-3-2漿料分散 50
第三章 實驗方法與流程 54
3-1實驗原料 54
3-1-1起始粉體 54
3-1-2分散劑 54
3-2實驗流程 55
3-2-1石膏模製程 55
3-2-2注漿成型流程 55
3-3特性分析 58
3-3-1粉末結晶相分析 58
3-3-2比表面積分析 58
3-3-3粉末顯微結構觀察 59
3-3-4漿料黏度分析 59
3-3-5粒徑分布分析 59
3-3-6生坯密度量測 60
3-3-7顯微結構觀察 60
第四章 結果與討論 61
4-1粉末原料分析 61
4-2漿料分析 67
4-2-1黏度分析 67
4-2-2粒徑分布分析 68
4-2-3混合後漿料分析 68
4-2-3-1 不同分散劑濃度的混合漿料分析 68
4-2-3-2 粉體混合之漿料分析 69
4-3生坯分析 81
4-3-1 L 混合組分析 81
4-3-2 M 混合組分析 82
4-4 綜合討論 83
第五章 結論 93
參考文獻 94

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