臺灣博碩士論文加值系統

羰基鐵為一種典型的吸波材料，具有比飽和磁化強度高、吸收頻帶寬和溫度穩定度高等優點，然而羰基鐵有密度大和吸收率不佳等缺點。本研究以羰基鐵粉為吸波主體，於球型研磨機中研磨，每經五小時取樣一次，觀察其顯微結構，再與聚氯丁烯橡膠混練，以製成重量百分比30%及50%，大小15 cm×15 cm，厚度1.0 mm之吸波片，並探討羰基鐵粉經不同研磨時間及不同重量百分比摻雜對電磁特性之影響；羰基鐵粉由圓球狀轉變為薄片狀，其介電常數與導磁係數的提升可以歸因於渦電流損耗的減少，磁性消失區域增加，導致磁矩方向改變以及空間電荷極化。實驗結果顯示：研磨45小時，重量百分比濃度為60%之EWI羰基鐵粉，厚度為1.9 mm之複合材料吸波膠片在7.04 GHz具有最大反射損失-28 dB，且其反射損失在-10 dB以上有3 GHz頻寬。對R1521羰基鐵粉研磨30小時，重量百分比濃度為30%，厚度為1.4 mm之複合材料吸波膠片在13.94 GHz具有最大反射損失-43 dB，且其反射損失在-10 dB以上有6 GHz頻寬。且經由適當之濃度調配與厚度設計，可得到適當頻寬下之微波吸收材料，並提供相關吸波材料進一步研究參考。

Carbonyl iron is a kind of typical absorbing material, which has high saturating magnetization, wide absorbing bandwidth and temperature stability, nevertheless it has big density and poor absorption rate. In this study, the microwave-absorbing properties for different shapes of carbonyl iron particles prepared by the ball milling with different grinding time and with 30 wt.%, 50 wt.%, and 60 wt.% in rubber matrix have been investigated. Higher value of magnetic permeability and permittivity can be obtained in the composite for thin flake carbonyl iron than spherical powders. The results are attributed to reduction of eddy current loss, orientation of magnetic moment and space-charge polarization with the shape change from spherical powders to thin flake particles. From the experimental results show that the return loss values for the EWI carbonyl iron power grounded 45 hours, with 60 wt.% and thickness of 1.9 mm composite absorber, has the minimum return loss values of -28 dB was at the frequency of 7.04 GHz ,and is less than -10 dB with a bandwidth more than 3 GHz. At the same time, for the R1521 carbonyl iron power grounded 30 hours, with 30 wt.% and thickness of 1.4 mm composite absorber, has the minimum return loss values of -43 dB was at the frequency of 13.94 GHz ,and is less than -10 dB with a bandwidth more than 6 GHz. With proper design, the required bandwidth and microwave absorbing material can be achieved and provide further study of microwave absorbing material for related applying field.

誌謝 ii
摘要 iii
Abstract iv
目錄 v
表目錄 ix
圖目錄 x
1. 緒論 1
1.1研究背景與動機 1
1.2研究目的 1
1.3研究方法 2
1.4論文架構 2
2. 文獻回顧與基本原理 3
2.1 吸波材料分類 3
2.1.1 傳統吸波材料 3
2.1.2 奈米吸波材料 3
2.1.3 導電聚合物吸波材料 3
2.1.4 手性吸波材料 4
2.2吸波材料之研發狀況 4
2.3基本原理 5
2.4 單層吸波材料吸波原理 7
2.5 吸波材料設計 8
2.5.1 電匹配特性研究 8
2.5.2 衰減特性研究 9
3.實驗流程與分析方法 11
3.1 實驗流程 11
3.1.1 羰基鐵粉研磨及樣品編號 11
3.1.2 實驗流程 11
3.1.3 實驗藥品 13
3.2 儀器分析 14
3.2.1 球型研磨機 14
3.2.2 向量網路分析儀 15
3.2.3 自由空間法 17
3.2.4 掃描式電子顯微鏡 18
4. 實驗結果與討論 21
4.1 羰基鐵粉之顯微結構分析 21
4.1.1 EWI羰基鐵粉之SEM分析 21
4.1.2 R1521羰基鐵粉之SEM分析 23
4.2 介電係數、導磁係數分析 24
4.2.1 R15-30wt.%之介電常數與導磁係數分析 24
4.2.2 R15-50wt.%之介電常數與導磁係數分析 28
4.2.3 EW-30wt.%之介電常數與導磁係數分析 31
4.2.4 EW-50wt.%之介電常數與導磁係數分析 34
4.3 反射損失分析 37
4.3.1 R15-30wt.%之反射損失分析 37
4.3.2 R15-50wt.%之反射損失分析 38
4.3.3 R15-60wt.%之反射損失分析 39
4.3.4 EW-30wt.%之反射損失分析 40
4.3.5 EW-50wt.%之反射損失分析 41
4.3.6 EW-60wt.%之反射損失分析 42
4.4 XRD分析 43
4.4.1 R1521之XRD分析 43
4.4.2 EWI之XRD分析 44
4.5 最佳化厚度模擬 46
4.5.1 EW-45-30wt.%模擬不同厚度之反射損失分析 46
4.5.2 EW-45-50wt.%模擬不同厚度之反射損失分析 48
4.5.3 EW-45-60wt.%模擬不同厚度之反射損失分析 49
4.5.4 EW-45-70wt.%模擬不同厚度之反射損失分析 50
4.5.5 R15-30-30wt.%模擬不同厚度之反射損失分析 51
4.5.6 R15-30-40wt.%模擬不同厚度之反射損失分析 52
4.5.7 R15-30-50wt.%模擬不同厚度之反射損失分析 53
4.5.8 R15-30-60wt.%模擬不同厚度之反射損失分析 54
4.5.9 R15-30-70wt.%模擬不同厚度之反射損失分析 55
4.6 最佳化厚度比對 56
4.6.1 EW-45-30wt.%實作量測與理論分析之比較 56
4.6.2 EW-45-50wt.%實作量測與理論分析之比較 57
4.6.3 EW-45-60wt.%實作量測與理論分析之比較 58
4.6.4 EW-45-70wt.%實作量測與理論分析之比較 59
4.6.5 R15-30-30wt.%實作量測與理論分析之比較 60
4.6.6 R15-30-50wt.%實作量測與理論分析之比較 61
4.6.7 R15-30-60wt.%實作量測與理論分析之比較 62
4.6.8 R15-30-70wt.%實作量測與理論分析之比較 63
5. 結論與未來研究方向 64
參考文獻 66
自傳 70

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