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研究生:謝仲凱
研究生(外文):Chung-Kai Hsieh
論文名稱:粉體物性及摻雜對鎳鋅銅鐵氧體機械性質之影響
論文名稱(外文):Effects of powder characteristics and dopants on the mechanical properties of Ni-Zn-Cu ferrites
指導教授:王錫福
指導教授(外文):Sea-Fue Wang
口試委員:吳玉娟林於隆徐永富
口試日期:2012-01-02
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:材料及資源工程系研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:79
中文關鍵詞:鎳鋅銅鐵氧體彎曲強度
外文關鍵詞:Ni-Zn-Cu ferritesBending strength
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本實驗研究採用商用粉末,首先利用改變球磨參數,經由不同球磨時間研磨後,針對粉徑、晶粒分佈等物理特性,其燒結後的機械性質之影響;其次,利用最佳之球磨參數,將氧化物A、B、C、D摻雜於鎳鋅銅鐵氧磁體,改變摻雜含量(0~5 wt%),探討摻雜含量不同對鎳鋅銅鐵氧體機械性質與磁特性的影響。
研究結果顯示,粉徑隨球磨時間增加而下降,其分佈範圍較為集中,對於燒結後晶粒分佈均勻,能有效提升材料之機械性質,球磨24小時可得最小之粒徑為0.54 μm,晶粒分佈呈現單峰狀態。另外,摻雜不同金屬氧化物,因各氧化物的離子半徑大小不同,有固溶及析出於基材之現象,導致於晶粒相成分、組織改變,進而影響機械性質、磁性能。適量的摻雜不同金屬氧化物,能有效提升機械性質,摻雜5.0 wt%氧化物B有最高抗折強度值143 MPa;過量的摻雜使晶粒異常成長、封閉孔產生,導致機械性質下降。磁性能方面,晶粒尺寸越大且晶粒邊界數量減少,使磁區壁容易移動,初始導磁率因此上升,在測試頻率為796 KHz,摻雜1.5wt % 氧化物D有最高初始導磁率為587。


Commercial available powder was used as host material in this study. After milling for various durations, the effects of the physical characteristics of the powders on the mechanical properties of the sintered ferrites were evaluated. The best milling parameters were then used throughout this study. Dopants including oxide A , B, C, D were added in Ni-Zn-Cu ferrites in the amount 0 ~ 5 wt% and their effects on the mechanical properties of Ni-Zn-Cu ferrites magnetic characteristics were investigated.
The results show that the particle size of the powder decreased with increasing milling time, and the particle size distribution became narrower. It was found that milling time of 24 h effectively reduced the average particle size down to 0.54 μm. Owing to both the ionic radius of the dopants and their solubility in the ferrite are different, the microstructural evolution of the sintered ferrites emerged to be significantly different and thus heir mechanical properties and magnetic properties as well. Of the dopants added, ferrite with 5.0 wt % oxide A addition registered the highest bending strength of 143 MPa. Too much oxide A addition would lead to abnormal grain growth and result in lower mechanical properties. As magnetic properties concern, ferrite with 1.5wt % oxide D addition reported the highest initial permeability of 587.


摘 要 i
ABSTRACT ii
致謝 iv
目 錄 v
表目錄 viii
圖目錄 ix
第一章 緒論 1
1.1 前言 1
1.2 研究動機及目的 2
第二章 研究文獻回顧 3
2.1 鎳鋅鐵氧體之強化機制 3
2.2 摻雜物對鐵氧磁體之機械性質 5
2.2.1 低熔點之元素 5
2.2.2 第二相析出之元素 7
2.2.3 第二相固溶之元素 9
2.3 缺陷對機械性質之影響 14
2.4 晶粒大小對機械性質之影響 16
2.5 孔隙率對機械性質之影響 17
第三章 實驗流程與分析方法 19
3.1 實驗藥品規格 19
3.1.1 商用鎳鋅銅鐵氧體粉末 19
3.1.2 摻雜物 20
3.2 實驗流程 21
3.2.1 粉末研磨試驗 21
3.2.2 商用鎳鋅銅鐵氧體摻雜氧化物 22
3.3 材料特性分析方法 25
3.3.1 粒徑大小與分佈量測 25
3.3.2 燒結密度量測 25
3.3.3 X-Ray相鑑定(XRD) 26
3.3.4 掃描式電子顯微鏡(SEM) 27
3.3.5 微小維克氏硬度 27
3.3.6 三點抗彎強度 28
3.3.7 初導磁率與品質因子 30
第四章 結果與討論 31
4.1 原始粉末特性 31
4.1.1 粉末粒徑分析 31
4.1.2 粉末微觀形貌分析 33
4.1.3 燒結之密度分析 33
4.1.4 燒結之微結構分析 34
4.1.5 粉末燒結後機械性質分析 37
4.2 摻雜氧化物A對鎳鋅銅鐵氧體機械性質之影響 39
4.2.1 燒結密度量測分析 39
4.2.2 X-ray繞射分析 39
4.2.3 SEM微結構分析 42
4.2.4 機械性質分析 46
4.2.5 磁性質分析 47
4.3 摻雜氧化物B對鎳鋅銅鐵氧體機械性質之影響 49
4.3.1 燒結密度量測分析 49
4.3.2 X-ray繞射分析 49
4.3.3 SEM微結構分析 51
4.3.4 機械性質分析 54
4.3.5 磁性質分析 56
4.4 摻雜氧化物C對鎳鋅銅鐵氧體機械性質之影響 58
4.4.1 燒結密度量測分析 58
4.4.2 X-ray繞射分析 58
4.4.3 SEM微結構分析 60
4.4.4 機械性質分析 62
4.4.5 磁性質分析 64
4.5 摻雜氧化物D對鎳鋅銅鐵氧體機械性質之影響 66
4.5.1 燒結密度量測分析 66
4.5.2 X-ray繞射分析 66
4.5.3 SEM微結構分析 69
4.5.4 機械性質分析 72
4.5.5 磁性質分析 74
第五章 結論 76
參考文獻 77



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