臺灣博碩士論文加值系統

本研究以添加微量銅(Cu)藉由熱處理來改善鐵錳矽硼非晶合金之軟磁性質並保有良好的非晶形成能力。以單輥熔射旋淬法製備成份Fe75Mn3Si10B12-XCuX(x=0, 1, 2, 3, 4 at.%)之五元合金薄帶。以X光繞射儀(XRD)及熱游離電子顯微鏡(SEM)鑑定試片之微觀結構。以示差掃描熱分析儀(DSC)分析材料之特性性溫度。以振動樣品磁力儀(VSM)量測試片的飽和磁化強度(Ms)及矯頑磁力(Hc)。以熱重分析計(TMA)量測試片之居里溫度(Tc)。
當銅添加量為2 at%以下時，由XRD，SEM-SEI分析顯示合金薄帶皆為非晶質結構。當銅添加量在3 at%以上，可由XRD，SEM-SEI分析出α-Fe、Fe3Si、Mn2B0.98相。藉由示差掃描熱分析儀測量非晶質結構(Cu=0, 1, 2 at.%)的合金薄帶，其過冷液態區間(ΔTx)分別為166.23 K和53.74 K。合金薄帶其結晶化溫度(Tx)隨著銅含量增加而有往低溫方向移動之趨勢。
Cu=1 at.%的合金薄帶，以300℃的退火60s時，有最低的矯頑磁力5.41 A/m。在450℃的退火下，有最高的飽和磁化強度1.57 T。藉由添加Cu於非晶基質中形成異質成核點可有效改善其軟磁性質。

The glass forming ability and soft magnetic properties of Fe-Mn-Si-B-Cu were investigated in this study. Multi-component alloy ribbons with compositions of Fe75Mn3Si10B12-XCuX(x = 0, 1, 2, 3, 4 at.%) were synthesized by the single roller melt-spinning method. To examine the thermal properties, the as-cast ribbons was measured with differential scanning calorimetry(DSC). Microstructure were examined by X-ray diffractometer(XRD) and scanning electron microscopy(SEM).
Alloying additions of Cu=0, 1, 2 at.% were confirmed amorphous by XRD and SEM images. When the additions came up to Cu=3, 4 at.%, α-Fe、Fe3Si、Mn2B0.98 phase were identified. Amorphous ribbons’ thermal properties were measured, supercooled liquid regions were 166.23 K and 54.73 K when additions of Cu=0, 1, at.% respectively. The saturation magnetization Ms was increased from 1.45 T to 1.57 T and coercivity Hc was decreased from 21.41 A/m to 5.41 A/m when annealing Fe75Mn3Si10B11Cu1 for 60s at 573 K and 673 K. It was verified that Cu alloying additions increased the nucleation rate can improve the soft magnetic properties of alloy ribbon.

摘 要 I
ABSTRACT II
誌 謝 III
目 錄 IV
表目錄 VII
圖目錄 VIII
第一章 前言 1
1.1 非晶質合金 1
1.2 非晶質合金的發展背景 3
1.3 鐵基非晶質合金 6
1.4參雜元素介紹 8
1.5 非晶材料的製備方法 9
1.6 研究目的與動機 11
第二章 文獻回顧與理論基礎 12
2.1 非晶質合金之轉換機制 12
2.2 非晶質合金形成之熱力學與動力學基礎 13
2.3 玻璃轉換溫度 14
2.4 非晶質合金的實驗歸納法則 15
2.5 塊狀非晶質合金之分類及主元素特性 17
2.6 非晶質合金的晶化行為 21
2.6.1 冷卻曲線與成核成長控制之關係 21
2.6.2 共晶點對非晶形成能力之影響 22
2.7 衡量玻璃形成能力(GFA)的參數 23
2.7.1 過冷液相區 (supercooled liquid region)，ΔTx 23
2.7.2 約化玻璃轉換溫度 (reduced glass transition temperature)，Trg 25
2.7.3 γ參數 26
2.8 磁性材料特性 29
2.8.1 磁滯曲線介紹 29
2.9 磁性非晶合金 31
2.9.1 磁性非晶合金背景 31
2.9.2 奈米晶軟磁材料 31
2.9.3 合金成分於非晶薄帶晶化過程中的作用 32
2.10磁晶異向性 34
2.11 Herzer模型 37
第三章 實驗流程與方法 39
3.1 實驗流程 39
3.1.1 合金成分配製 39
3.1.2 母合金鑄錠熔煉 40
3.1.3 熔射旋淬薄帶製備 41
3.2 實驗分析 42
3.2.1 X-ray繞射分析儀(XRD) 42
3.2.2 掃描式電子顯微鏡(SEM)與能量分散質譜儀(EDS) 43
3.2.3 示差掃描熱分析儀(Differential Scanning Calorimetry) 44
3.2.4 振動樣品磁力儀 45
3.2.5 熱重分析計 46
第四章 結果與討論 48
4.1 母合金鑄錠及合金薄帶外觀觀察 48
4.2 母合金鑄錠分析 49
4.3 合金薄帶分析 51
4.3.1 合金薄帶XRD相鑑定 51
4.3.2 合金薄帶顯微結構分析 52
4.3.3 合金薄帶非恆溫熱性質分析 55
4.4 合金薄帶軟磁性質分析 59
4.4.1 磁滯曲線 59
4.4.2 居禮溫度分析 61
4.5 熱處理後合金薄帶結構與磁性質分析 63
4.5.1退火後之合金薄帶XRD相鑑定 63
4.5.2退火後合金薄帶顯微結構分析 67
4.5.3退火後合金薄帶之軟磁性質分析 69
第五章 結論 75
參考文獻 76

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