臺灣博碩士論文加值系統

近年來，積層陶瓷電容的微型化，主要是以介電層薄層化為主要趨勢[4]，此乃因獲得高電容值之積層陶瓷電容，其最有效的方式為降低積層陶瓷電容中介電層厚度以增加介電層數。本研究主要是希望能瞭解鈦酸鋇粉體經由高能研磨後其相關物理性質的變化，在此實驗中以新式的珠磨機為主要儀器，並以研磨時間為實驗變數在同一批實驗中直接取樣，選用兩種不同的商業鈦酸鋇粉末並加入介電陶瓷添加劑，針對高能研磨後樣品粉之粉體物性、燒結後性質及其介電特性進行試驗比較。
本實驗結果顯示，隨著比能量與珠磨時間增加，鈦酸鋇粉末之粒徑與c/a比會隨之降低且粒度分佈會向偏移並集中；當鈦酸鋇粉末之起始粉末粒徑越小其經過適當溫度燒製後，可發現陶瓷體之平均晶粒尺寸會對其介電性質有顯著之影響。

Demands are high in recent years for the thin dielectric layer of multi-layer ceramic capacitor (MLCC) for development of miniaturization. To achieve high capacitance values, the thickness of the dielectric layer in MLCC should the decreased are the number of the MLCC intermediate layer need to increased.
In this investigation, influences of the high energy bead milling on physical properties of BaTiO3 powder are studied. The experiment instrument was a new type of bead miller. One of the experimental variables was the milling time, while two different commercial powders used were barium titanate powders (BaTiO3) with dielectric ceramic additive powders. In order to discuss the effects of beads milling time, physical, sintering and dialect properties of milled powders are investigated.
In the present study, bead milling time was selected as a process parameter to affect the powder properties. After milling for different times, the powders were characterized in terms of size distribution and c/a ratio and the microstructure and dielectric property of sintered samples, aiming at understanding the relationship between bead milling condition and the powder characterized.
The results show that barium titanate powder of particle size and the c / a ratio decrease and the powder size distribution is shifted and become narrow when the specific milling energy and time increase. After sintering, the results reveal the dielectric properties changes with the sample microstructure.

摘要 I
ABSTRACT II
誌謝 IV
目錄 V
圖目錄 VIII
表目錄 XI
第一章 前言 1
1.1 前言 1
1.2 研究目的 2
第二章 理論基礎與文獻回顧 3
2.1 鈦酸鋇之基礎性質 3
2.1.1 鈦酸鋇晶體結構與性質 3
2.1.2 鈦酸鋇之介電特性 5
2.1.3 鈦酸鋇之介電損失 6
2.2 影響鈦酸鋇材料特性之變數 7
2.2.1 鈦酸鋇之粒徑大小及表面效應 7
2.2.2 鈦酸鋇之晶粒尺寸與晶粒效應 8
2.2.3 A/B比對鈦酸鋇之影響 9
2.2.4 摻雜對鈦酸鋇之影響 11
2.2.5 燒結氣氛對鈦酸鋇之影響 11
2.3 珠磨機原理 12
2.3.1 珠磨機概述 12
2.3.2 比能量 13
2.3.3 珠磨機之分散與研磨原理 15
2.4 珠磨條件對鈦酸鋇特性之影響 17
2.4.1 磨球尺寸效應 18
2.4.2 研磨時間的影響 19
第三章 實驗步驟與分析方法 21
3.1 實驗藥品規格 21
3.1.1 商業鈦酸鋇粉末 21
3.1.2 添加劑 23
3.1.3 銀電極膏 24
3.1.4 黏結劑(PVA) 24
3.2 實驗方法與製程 25
3.2.1 鈦酸鋇粉末研磨試驗 26
3.2.2 鈦酸鋇加添加劑研磨試驗 28
3.2.3 樣品燒製與電極燒附製程 30
3.2.4 樣品燒製後檢測流程 32
3.3 實驗使用儀器與操作條件 33
3.3.1 塊材密度量測 33
3.3.2 粒徑量測 33
3.3.3 比表面積(BET)量測 34
3.3.4 X-ray繞射(XRD)分析 34
3.3.5 掃描式電子顯微鏡(SEM)分析 35
3.3.5.1 晶粒尺寸計算 35
3.3.6 介電性質量測 35
第四章 結果與討論 37
4.1 原始粉末特性 37
4.1.1 粒徑分析 37
4.1.2 粉末比表面積分析 38
4.1.3 相組成分析 39
4.1.4 粉末微觀形貌分析 42
4.1.5 粉體鋇鈦比與鋯含量分析 43
4.2 添加物之物理特性 44
4.2.1 粒徑分析 44
4.2.2 相組成分析 44
4.2.3 粉末微觀形貌以及EDS分析 45
4.3 珠磨後粉體特性 47
4.3.1 粒徑與比表面積分析 47
4.3.2 粒度分佈變化 48
4.3.3 相組成分析 51
4.3.4 晶格常數分析 56
4.3.5 粉末微觀形貌分析 58
4.3.6 Zr含量分析 62
4.3.7 再現性分析 63
4.4 燒結後特性 64
4.4.1 生胚密度分析 64
4.4.2 密度分析 65
4.4.3 相成份分析 66
4.4.4 微結構分析 68
4.4.5 介電性質分析 74
第五章 結論 76
參考文獻 78

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