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研究生：	周倉民 Zhou, Chang-Min
論文名稱：	添加微量氧化鋁對於釔安定正方晶相氧化鋯(3Y-TZP)陶瓷的微結構及燒結行為之影響 Effect of a Minute Addition of Alumina on the Microstructure and Sintering Behavior of 3Y-TZP Ceramics
指導教授：	向性一 Hsiang, Hsing-I 陳智成 Chen, Chin-Cheng
學位類別：	碩士 Master
系所名稱：	工學院 - 資源工程學系 Department of Resources Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	中文
論文頁數：	88
中文關鍵詞：	釔安定正方晶相氧化鋯陶瓷、共沉
外文關鍵詞：	3Y-TZP Ceramics, co-precipitation
相關次數：	點閱：61 下載：7
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本研究採用化學共沉法，將微量氧化鋁均勻混合於氧化鋯之中，製備Y-TZP/Al2O3奈米複合粉末，並藉由燒結收縮的分析及微結構的觀察，探討微量氧化鋁在氧化鋯燒結行為上所扮演的角色。
實驗結果發現，添加微量(0.25wt%)氧化鋁有抑制釔安定正方晶相氧化鋯晶粒成長及促進燒結體緻密化的功效。在粉末煆燒過程中，由於氧化鋁和氧化鋯之間的交互作用，減緩了氧化鋯的晶粒成長，且在燒結過程中，氧化鋁會促使氧化鋯產生氧空缺而有促進燒結的功效。本研究藉由TEM的觀察及阻抗分析發現，當燒結溫度超過1275℃時，氧化鋁傾向偏析至晶界，且隨著燒結溫度的升高，偏析的現象愈顯著；剛從氧化鋯中偏析之氧化鋁是以非晶質相(Amorphous phase)的型態存在於晶粒之交界處。而且氧化鋁的偏析也導致燒結過程中晶界的遷移速率降低，進而減緩氧化鋯晶粒之成長。

In this study, well-dispersed Y-TZP/Al2O3 nano-powders (designated as Y-TZP-A) have been prepared via a chemical co-precipitation method. The resultant samples were characterized using transmission electron microscopy (TEM) and resistivity measurements. The effect of alumina addition on the microstructure and sintering behavior of 3Y-TZP ceramics was discussed.
The experimental results indicate that a minute addition (0.25wt%) of alumina can suppress the grain growth of Y-TZP and promote the densification of sintering body. It is due to the generation of oxygen vacancy which is resulted from the mutual interaction between zirconia and alumina. Furthermore, the TEM and resistivity analysis results indicate that alumina would segregate to the grain boundary when the sample was sintered at temperature higher than 1275℃. The amount of segregation increases apparently with increasing the sintering temperature. The segregated alumina was characterized as the Al-rich amorphous species at the grain boundary, which reduced the mobility of grain-boundary and retarded the grain growth of Y-TZP.

摘要	I
Abstract	II
致謝	III
目錄	IV
表目錄	VI
圖目錄   VII
第一章 緒論	1
1-1 前言	1
1-2 研究目的	3
第二章 理論基礎與前人研究	4
2-1 氧化鋯的介紹	4
2-1-1 氧化鋯的基本性質	4
2-1-2 氧化鋯的應用	5
2-2 氧化鋯粉末的合成	6
2-2-1 化學沉澱法	6
2-2-1-1 液相法製備粉末的凝聚現象	7
2-2-2 溶膠-凝膠 (Sol-gel)	8
2-2-3 其它	9
2-3 影響化學共沉法的因子	14
2-4 反凝聚的方法 (粉末後處理法)	20
2-5 添加Al2O3對Y-TZP之影響	22
2-5-1 ZrO2-Al2O3系統的固溶極限	22
2-5-2 添加氧化鋁對氧化鋯結晶成長之影響	23
2-5-3 添加氧化鋁對Y-TZP低溫時效劣化之影響	24
2-6 低溫時效劣化	29
2-7 偏析 (Segregation)	33
2-7-1  晶界偏析行為的模型	33
2-7-2  Al2O3在氧化鋯中偏析的型態	41
2-8 阻抗分析	42
第三章 實驗方法及步驟	44
3-1 起始原料	44
3-2 粉末製備及分析	44
3-2-1 粉末製備	44
3-2-2 粉末之DTA/TG分析	45
3-2-3 粉末之FTIR分析	45
3-2-4 MTS粉體壓密試驗(凝聚體強度測定)	45
3-2-5 粉末粒徑分析	45
3-3 燒結體製備及材料特性分析	47
3-3-1 燒結體製備	47
3-3-2 相鑑定	47
3-3-3 密度量測	48
3-3-4 燒結收縮曲線量測	48
3-3-5 顯微結構觀察	48
3-3-6 穿透式電子顯微鏡之觀察	49
3-3-7 電性量測	49
第四章 結果與討論	53
4-1 煆燒條件之影響	53
4-1-1 熱性質分析	53
4-1-2 煆燒溫度對結晶大小及凝聚體的影響	53
4-1-3 收縮情形及微結構的觀察	54
4-2 添加微量氧化鋁對氧化鋯結晶及燒結行為之影響	63
4-2-1 粒徑大小與結晶相的觀察	63
4-2-2 添加氧化鋁對燒結行為的影響	63
4-2-3 添加氧化鋁對於氧化鋯陶瓷在低溫時效性劣化(LTD)上的影響	64
4-2-4 氧化鋁在氧化鋯微結構中的影響	64
4-3 本研究成果與文獻之比較	80
第五章 結論	82
參考文獻	83
                                    

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校內：2008-07-21公開
校外：2008-07-21公開

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