臺灣博碩士論文加值系統

本研究為將陶瓷材料之氧化鋯進行粉末擠製之研究。以氧化鋯（ZrO2）粉末為原料，用擠製加工的方法，製造出陶瓷的棒材或線材，作為沖壓模具零件，如沖頭或其他微小模具零件，藉由氧化鋯具有的耐磨耗性、高硬度、高韌性及抗磁性的特點，改善沖模之使用壽命應用在生產方面，可以提高生產量，進而降低生產成本。首先將混練過的40nm∼1μm平均粒徑之氧化鋯粉末、添加劑及潤滑劑等材料混練成為膏狀材料（Paste material）而進行擠製之分析及實驗，以球形速度場模擬擠製時，材料之流變行為，也分析探討擠製因素如擠製比、半模角、潤滑等條件對擠製之成品尺寸、強度（密度）及擠製壓力的影響。並將擠胚作燒結之處理，以巨觀的方式，量測擠胚燒結後之硬度及密度分佈的情形，及以微觀的方式利用X光繞射（XRD）與掃描式電子顯微鏡（SEM）觀察，探討粉末擠製加工、擠胚成型過程與燒結特性的關連性，作系統性的定性與定量分析。

This research is to study the extruding behavior of ceramic zirconia powders. Prior to extrusion processes, the zirconia powders with some additives and lubrication agents are regarded as paste material and simulated their rheological behavior by spherical velocity field. The effects such as extrusion ratio, semi-dieangle and lubrication on extrusion products、strength (density) and extrusion pressure are also analyzed during extrusion of paste materials. The hardness, density distribution, microstructure and morphologies of the sintered extruded zirconia were investigated by X ray diffraction (XRD) and scanning electron microscope (SEM) in order to analyze systematically the relationship among the simulated extrusion behavior, extruding processes and the properties of sintered zirconia.

目 錄
中文摘要
英文摘要
誌謝
目錄
表目錄
圖目錄
符號說明
第一章 緒論
1-1 研究目的與動機
1-2 文獻回顧
第二章 擠製模具之補強環設計
2-1 厚壁圓筒理論之推導
2-2 二層補強環之設計
第三章 膏狀材料擠製理論
3-1 膏狀材料之理論擠製參數
3-2 球形速度場之理論堆導
第四章 實驗方法
4-1 實驗規劃及製程參數的決定
4-2 實驗設備
4-3 實驗材料與模具
4-4 實驗步驟
4-4-1 壓胚成型實驗
4-4-2擠製分析與實驗
4-4-3 擠胚燒結實驗
4-4-4 擠胚燒結性能分析
第五章 實驗結果與討論
5-1 擠製參數分析與擠胚觀察
5-1-1 擠胚之擠製實驗參數分析
5-1-2 膏狀材料理論參數與實驗參數之比較
5-1-3 流線位移分佈圖－視塑性法
5-1-4 擠胚表面與內部型態探討
5-2 擠胚燒結後內部微組織之觀察
5-2-1 氧化鋯陶瓷之特性分析
5-2-2 氧化鋯燒結體之硬度分析－維克式硬度試驗
5-2-3 氧化鋯燒結體之孔隙率
5-2-4顯微組織之觀察－掃描式電子顯微鏡（SEM）
第六章 結論
參 考 文 獻
附錄A
附錄B
簡歷

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