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研究生： 蔡欣翰
Tsai, Shin-Han
論文名稱： 粉末前處理對鈦酸鍶燒結行為之影響
The effects of powder pretreatment on the sintering behavior of strontium titanate
指導教授： 黃啟祥
Hwang, Chii-Shyang
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 中文
論文頁數： 84
中文關鍵詞： 鈦酸鍶 、前處理 、燒結
外文關鍵詞： SrTiO3, pretreatment, sintering
相關次數： 點閱：58  下載：14 
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    • 鈦酸鍶 (SrTiO3) 是一種具有鈣鈦礦型的晶體結構的電子功能陶瓷材料，其介電常數高、介電損耗低且熱穩定性高，因此用途十分廣泛，最常被應用在電容材料 (MLCC)；近年SrTiO3亦被發現有超導、光觸媒之應用及可作為燃料電池極板，因此SrTiO3是一種值得深入研究的陶瓷材料，但作為塊材之應用上有一缺點為難以燒結緻密。
    因此為提升 SrTiO3 塊材之相對密度，除了以新穎的燒結手法來提升塊材密度之外，原始粉末也是影響塊材密度的重要因素，一般常以摻雜或以奈米級的前驅粉末為起始原料來提升塊材之密度。
    以水熱法120 ℃/6 h 合成的奈米級SrTiO3粉末，含有乙二醇之聚合物等雜質且易成凝聚體。為減少此等雜質及奈米粉體凝聚現象，本研究檢討超音波震盪處理及pH值的控制，對SrTiO3粉末燒結行為之影響。實驗顯示超音波震盪處理並離心清洗至pH=8.5再以600 ℃煆燒5小時之粉體，經成形後在Ar-5 % H2的氣氛下加熱至1300 ℃持溫4小時，所得塊材之相對密度93.56 %，晶粒大小約為600 nm~1 μm；結晶相均為單一的鈦酸鍶相。

    La-doped SrTiO3 nano powders were synthesized by hydrothermal method. However, there are impurities, including organics and nitrate, remaining on the surface of powders which inhibit the sintering of powders. In order to improve the densification of SrTiO3 powders, powder pretreatment was used in this study. Ultra-sonication is good for reducing agglomeration and helpful for particle dispersion. Agglomeration of SrTiO3 powders caused by organics and nitrate can be reduced by ultra-sonication and centrifugal washing until pH=8.5. Calcination can remove the residual organics and nitrate. In this study, SrTiO3 powders were pretreated by ultra-sonication centrifugal washing to pH=8.5 and calcined at 600 ℃ for 5 h, then sintered at 1300 ℃ for 4 h in Ar-5 % H2. The relative density of sintered bulk is 93.56 %, and the grain size is 600~1000 nm.

    中文摘要 I Abstract II 誌謝 XIII 目錄 XV 圖目錄 XIX 表目錄 XXII 第一章 緒論 1 1-1 前言 1 1-2 研究動機目的及策略 2 第二章 相關文獻回顧及整理 3 2-1 鈦酸鍶之相關背景 3 2-2 鈦酸鍶粉體之製備 5 2-3 鈦酸鍶燒結性之相關研究 11 2-4 燒結原理 16 2-4-1 燒結驅動力與擴散路徑 17 2-4-2 固相燒結 18 2-4-2-1 固相燒結三階段 18 2-4-2-2 影響固相燒結的因素 20 2-4-3 液相燒結 21 2-4-4 新穎的燒結方法 22 2-5 膠體分散系統 25 第三章 實驗方法與步驟 34 3-1 實驗用藥品及原料 34 3-2 實驗流程 35 3-3 材料性質之分析 37 3-3-1 結晶相鑑定 37 3-3-2 燒結體密度之量測 37 3-3-3 顯微結構之分析 38 3-3-4 熱種熱差分析 38 3-3-5 傅里葉轉換紅外光譜 38 3-3-6 介面電位分析儀 38 第四章 結果與討論 41 4-1 水熱法合成鈦酸鍶粉體分析及燒結行為 41 4-1-1 合成粉體之相鑑定及熱重熱差分析 41 4-1-2 傅立葉轉換紅外線光譜分析 41 4-1-3 鈦酸鍶粉末之燒結性 42 4-2 前處理對鈦酸鍶粉體之影響 47 4-2-1 超音波震盪處理對鈦酸鍶粉體之影響 47 4-2-2 離心清洗至不同pH值對鈦酸鍶粉體之影響 47 4-2-3 煆燒溫度對鈦酸鍶粉體之影響 48 4-3 前處理鈦酸鍶粉末之燒結性 59 4-3-1以1200 ℃ 4 小時於Ar-5 % H2 下燒結之燒結體 59 4-3-1-1 結晶相鑑定 59 4-3-1-2 顯微結構 59 4-3-2以1300 ℃ 4 小時於Ar-5 % H2 下燒結之燒結體 66 4-3-2-1 結晶相鑑定 66 4-3-2-2 顯微結構 66 4-3-3以1400 ℃ 4 小時於Ar-5 % H2 下燒結之燒結體 72 4-3-3-1結晶相鑑定 72 4-3-3-2 顯微結構 72 第五章 結論 78 參考文獻 79

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