臺灣博碩士論文加值系統

本研究透過焦電材料(PZT)直接將熱能化為電能，利用結構設計和外部施加電場來提高焦電材料的材料能量轉換效率，並將料承受週期性冷熱變化，利用材料因溫度誘導極化產生電力。冷風槍溫度為50°C，而熱風槍為120°C、140°C、160°C、180°C及200°C五種熱源溫度並對應升降溫週期時間為11sec、12sec、14sec、22sec及28sec共五種，使PZT可在不同時變溫度率及工作週期下，執行奧森循環進行PZT元件之特性量測。
透過各材料執行奧森循環實驗，MD-0.2(厚度為0.2mm)為材料中最薄試片，所獲得之能量密度與功率密度分別是175.81 J/L和14.59 W/L，以及最厚材料MD-0.6之能量密度與功率密度為105.5 J/L和7.49 W/L，將MD-0.2與MD-0.6互相比較，其能量密度相差1.6倍，功率密度相差將近2倍，顯示出材料厚度與能量密度和功率密度在相同電場及最佳溫度狀況下成反比。在相同厚度0.2mm狀況下比較材料規格KA、MD和QA， KA材料在電場5MV/m所得能量密度327.22 J/L與能量密度27.15 W/L為最佳，相較於其他材料，KA材料的耐壓程度為最佳，而MD材料雖耐壓程度不比KA材料高，但材料因溫度變化影響，其電偶極矩變化量為最佳。且材料厚度的提升，其臨界電場會因為材料的增加也會隨之成長，KA材料之耐壓程度為最佳。

This study uses pyroelectric materials (PZT) to directly convert heat into electrical energy, uses structural design and external applied electric fields to improve the energy conversion efficiency of pyroelectric materials. The pyroelectric materials are subjected to periodic cold and heat changes, and the materials are temperature-induced polarization to generate electricity. The temperature of the cold air gun is 50°C, while the hot air gun has five heat source temperatures of 120°C, 140°C, 160°C, 180°C and 200°C. The corresponding heating and cooling cycle times are 11sec, 12sec, 14sec, 22sec and 28sec. The performances of PZT materials with the Olsen cycle can be measured with different temperature variation rates and working cycles.
The experiment of the Olson cycle is performed with each material, and MD-0.2 with the thickness of 0.2mm is the thinnest cell. The energy density and power density are 175.81 J/L and 14.59 W/L, respectively. Moreover, the energy density and power density of the thicker cell MD-0.6 are 105.5 J/L and 7.49 W/L, respectively. Comparing MD-0.2 and MD-0.6, the difference in energy density is 1.6 times, and the difference in power density is nearly 2 times. The thickness of cells is inversely proportional to energy density and power density under the same electric field and optimal temperature conditions. Comparing the material specifications of KA, MD and QA under the same thickness of 0.2mm, the best energy density is 327.22 J/L and the best energy density is 27.15 W/L at the electric field of 5MV/m applied to KA cell. Compared with other materials, KA cell can be applied to higher electrical fields. Although MD cell can not bear higher electrical fields than KA cell, the variation of electric dipole moment of MD cell is the best from temperature changes. Hence, the critical electric field increases with increasing the thickness of cells, and KA materials can bear higher electrical fields.

摘要...i
Abstract...ii
誌謝...iii
目錄...iv
表目錄...vi
圖目錄...vii
符號說明...xxi
第一章 緒論...1
1.1研究背景與動機...1
1.2 文獻回顧...2
1.3研究目的...12
第二章 理論介紹...13
2.1材料特性...13
2.2焦電效應...15
2.3奧森循環(Olsen cycle)...17
第三章 實驗方法 19
3.1 焦電元件材料特性...20
3.2焦電元件夾治具...23
3.3量測方法與架構...26
3.4程式架構...31
第四章 結果與討論...36
4.1 實驗(一)-相同電場EH和不同溫度TH獲得ND與PD...36
4.2 實驗(二)-MD材料於最佳溫度與最佳電場之功率密度比較...73
4.3 實驗(三)-相同厚度與不同規格之材料在最佳電場與最佳溫度下所獲得之功率密度與能量密度差異...74
4.4實驗(四)-各材料之臨界電場...78
4.5實驗(五)-KA-0.2之最佳頻率測試...83
第五章 結論...85
5.1 總結...85
5.2 未來展望...86
參考文獻...87
Extended Abstract...91

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