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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 段維新(Wei-Hsing Tuan) | |
dc.contributor.author | Chung-Jung Lin | en |
dc.contributor.author | 林鐘榮 | zh_TW |
dc.date.accessioned | 2021-07-11T15:06:16Z | - |
dc.date.available | 2021-12-31 | |
dc.date.copyright | 2019-08-27 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-08-14 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/78596 | - |
dc.description.abstract | 近期氧化鋁奈米複合材料發展新增對電子元件中散熱基板的需求,本研究嘗試添加少量0.57~8.5 vol%的奈米碳(nano-carbons包括:奈米碳管、石墨烯或奈米鑽石)與氧化鋁粉末混合製漿,再壓成生胚片後以脈衝電流燒結技術(PECS)使奈米複合材料緻密化,期望透過添加高導熱的奈米碳材料,大幅改善氧化鋁的導熱性和韌性。
由於石墨烯及奈米碳管緻密化過程中在晶界累積形成阻礙以及奈米鑽石在緻密化過程中發生釘扎效應(pinning effect),在添加少量石墨烯及奈米鑽石的確略微提高氧化鋁之導熱率,但隨著奈米碳添加量的增加,卻反使導熱率快速下降。在校正孔隙率和晶粒尺寸的影響之後,顯示添加少量的奈米碳對於導熱率的增加有所助益,但是超過臨界值後,添加奈米碳後將使導熱率急速下降。 本論文討論三種不同奈米碳(nano-carbons)對於氧化鋁複合材料之熱物理性能的影響,並且若要發揮的優異熱傳導性,必須同時考慮到結構特徵與熱傳方向。其中,二維石墨烯的最佳傳熱方向是平面的,但卻恰好垂直於熱傳的目標方向;一維奈米碳管的最佳傳熱方向是沿軸向,但由於奈米碳管的纏繞效應,傳熱的結果顯示是隨機的,熱傳效益也可能相互抵消,未能發揮CNT的優良傳熱性能。零維的納米金剛石是目前最好的添加劑,因為它沒有特定的傳熱方向,並且該結構不會在晶界處產生阻礙,這會影響緻密化。這項工作的結果表明奈米鑽石和PECS技術的巨大潛力適合陶瓷複合材料的各種工程應用。 | zh_TW |
dc.description.abstract | The latest developments in power electronics have increased the demand for heat-dissipating substrates. The present study prepared the alumina slurry with the addition of a small amount (0.57 to 8.5 vol%) of nano-carbon (carbon nanotubes, graphene or nanodiamonds). The slurry was compressed into a green compact. The nanocomposite was prepared using the pulsed electric current sintering (PECS) method.
The nano-carbons (graphene/nanodiamond/CNT, less than 1 vol%) play the role of heat transfer in the nanocomposites. In terms of the structural characteristics, and the heat transfer, the best heat transfer direction for 2D-graphene is its planar direction. It happens to be perpendicular to the heat transfer direction of the target. The best heat transfer direction of 1D-CNT is along the axis direction. Because of the entanglement of CNT, the direction of heat transfer is random, and the efficiency of heat transfer might offset each other. Therefore, the CNT failed to play an excellent role in heat transfer. Zero-dimensional nanodiamond is currently the best additive because it has no specific heat transfer direction, and its specific surface area is smaller compared to that of graphene and CNT. Moreover, its presence does not affect the densification. The present study shows that a small amount of nanodiamond (less than 1 vol%) leads to a better heat transfer than pure alumina. | en |
dc.description.provenance | Made available in DSpace on 2021-07-11T15:06:16Z (GMT). No. of bitstreams: 1 ntu-108-D95527002-1.pdf: 9834063 bytes, checksum: 1211a15fe19a0bc8931d92cbe4c8fb67 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 致 謝 II
摘 要 III Abstract IV Contents V List of Tables XII Chapter 1 Introduction 1 Chapter 2 Literature survey 3 2-1 Development and application of carbon nanotubes, graphene, and nanodiamond 3 2-1-1 Nano-carbon: graphite, carbon nanotubes, graphene, and nanodiamonds 3 2-1-2 Development of carbon nanotubes 3 2-1-3 Graphene - the first 2D material 4 2-1-4 Development of nanodiamond 4 2-1-5 Chemical properties and physical properties of nano-carbons 5 2-2 Nanocomposite 6 2-2-1 Brief introduction of nanocomposites 6 2-2-2 Characteristics and advantages of alumina nanocomposite 8 2-3 Pulsed Electric Current Sintering 9 2-3-1 Principle of PECS 9 2-3-2 Applications and advantages of PECS 10 2-4 Introduction to material properties test methods 11 2-4-1 Density 11 2-4-2 Scanning Electron Microscope (SEM) 13 2-4-3 Raman spectroscopy 13 Chapter3 Experimental procedures 17 3-1 Experimental design 19 3-1-1 Starting materials 19 3-1-2 Preparation of alumina/CNT、graphene nanocomposites 23 3-1-3 Preparation of alumina/nanodiamond nanocomposites 28 3-1-4 Sintered specimen machining 28 3-2 Physical property testing 30 3-2-1 X-ray diffraction analysis 30 3-2-2 Density measurement 31 3-2-3 Microstructure observation 33 3-2-4 Thermal conductivity measurement 34 3-2-5 Conductivity test 37 Chapter 4 Results 39 4-1 Alumina-CNT/graphene nanocomposite 39 4-1-1 Microstructure Analysis and EDS of green tapes 39 4-1-2 Sintering temperature planning 43 4-1-3 Density of nanocomposite 44 4-1-4 Phase identification 46 4-2 Alumina-nanodiamond nanocomposite 50 4-2-1 Green compact and sintering 50 4-2-2 Density of nanocomposite 51 4-2-3 Phase identification 52 Chapter 5 Discussion 54 5.1 Characteristic of adding carbon nanotubes to alumina nanocomposites 54 5.1.1 Effect of microstructure of alumina-CNT nanocomposites 54 5-1-2 Effect of thermal conductivity of alumina-CNT nanocomposites 63 5.2 Characteristic of adding graphene to alumina nanocomposites 67 5.2.1 Effect of microstructure of alumina-graphene nanocomposites 67 5.2.2 Effect of thermal conductivity of alumina-graphene nanocomposites 77 5.3 Characteristic of adding nanodiamond to alumina nanocomposites 82 5.3.1 Effect of microstructure of alumina-nanodiamond nanocomposites 82 5.3.2 Effect of thermal conductivity of alumina-nanodiamond nanocomposites 85 5.4 Comprehensive comparison and discussion 87 5.4.1 Comparison of thermal conductivity of alumina-CNT composites with different production methods 87 5.4.2 Comparison of thermal diffusivity of alumina-graphene/CNT composites 89 5.4.3 Comparison of the specific heat capacity of alumina-graphene/CNT composites 92 5.4.4 Comparison of thermal conductivity of alumina-graphene/CNT composites 94 5.4.5 Calculation of mean free path of alumina-graphene/CNT composites 99 5.4.6 Comparison of porosity effect on thermal conductivity 101 5.4.7 Comparison of nano-carbon adding effect on thermal conductivity 106 Chapter 6 Conclusions 111 Chapter 7 Future works 112 References 113 | |
dc.language.iso | en | |
dc.title | 以脈衝電流燒結氧化鋁/奈米碳材複合材料及其性質分析 | zh_TW |
dc.title | Preparation of alumina/nano-carbon composites by pulsed electric current sintering and their performance | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 周振嘉(Chen-Chia Chou),謝宗霖(Tzong-Lin Shieh),郭錦龍(Chin-Lung Kuo),施劭儒(Shao-Ju Shih) | |
dc.subject.keyword | 石墨烯,奈米碳管,奈米鑽石,氧化鋁奈米複合材料,熱傳導, | zh_TW |
dc.subject.keyword | graphene,CNT,nanodiamond,alumina composite,thermal conductivity, | en |
dc.relation.page | 119 | |
dc.identifier.doi | 10.6342/NTU201902458 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-08-14 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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