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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 段維新 | |
| dc.contributor.author | Cheng-Yen Hsu | en |
| dc.contributor.author | 許正衍 | zh_TW |
| dc.date.accessioned | 2021-06-15T13:26:41Z | - |
| dc.date.available | 2017-08-02 | |
| dc.date.copyright | 2016-08-02 | |
| dc.date.issued | 2015 | |
| dc.date.submitted | 2016-03-10 | |
| dc.identifier.citation | REFERENCES
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Bull., 38 [2] 319-331 (2003). [60] D. Dimas, I. Giannopoulou and D. Panias, “Polymerization in Sodium Silicate Solutions: A Fundamental Process in Geopolymerization Technology”, J. Mater. Sci., 44 3719-3730 (2009). [61] B. J. Dalgleish, K. P. Trumble and A. G. Evans, “The Strength and Fracture of Alumina Bonded with Aluminum Alloys”, Acta Metall. Mater., 37 [7] 1923-1931 (1989). [62] J. Davidovits, Geopolymer: Green Chemistry and Sustainable Development Solutions, Geopolymer Institute, Saint-Quentin (2005). | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51172 | - |
| dc.description.abstract | 陶瓷材料的接合長久以來一直是具有挑戰性的研究主題。本研究的主要目的是探討以偏高嶺土基無機聚合物對氧化鋁基板之接合。
無機聚合物具有在接合過程中為液相又能在固化後強硬的特殊條件。本研究中使用氫氧化鈉強鹼溶液活化合成無機聚合物的分解與聚合等化學反應。鈉含量對於無機聚合物整體的性質有極大的影響，因此本研究中設計合成數種不同鈉含量之無機聚合物進行比較。同時，對於接合完成之三層試片進行微結構與機械性質等之量測。 結果顯示過量的鈉會散佈並插入在無機聚合物的結構中，使其不易形成交連架狀結構，進而使聚合度下降。如抗壓強度試驗的結果顯示鈉含量為10.7%的試樣強度明顯減弱。而紅外線光譜的分析結果也顯示聚合度會隨著鈉含量上升而降低。除此之外，由於鈉在高溫下易揮發，因此高鈉含量的試樣在加熱時會有較大的重損甚至產生形變。隨著溫度增加至攝氏700 度以上，原本非晶質的無機聚合物會相變為結晶的霞石。 而針對氧化鋁基板接合的三層試片，透過微結構與成分分析，顯示界面處有氧化鈉的生成，此氧化鈉層做為仲介層提升了氧化鋁與無機聚合物之間的界面強度。此外，四點彎曲試驗的結果也指出界面強度與鈉含量呈現正相關。熱導率的測量結果則顯示填入無機聚合物能夠有效降低氧化鋁基板之間的熱傳導。 | zh_TW |
| dc.description.abstract | The joining of ceramic materials is a challenging issue. The primary purpose of the present study explores the use of metakaolin-based geopolymers to bond alumina substrates.
The geopolymer mortar is in liquid form before bonding. A strong structure is achieved after curing. In the present study, sodium hydroxide is able to activate the reactions in geopolymer. The sodium content is a critical factor for geopolymers; the sodium content in the geopolymer in the present study is varied. The resulting microstructure and mechanical properties of the Al2O3/geopolymer/Al2O3 joined specimens are measured. The results demonstrate that excess sodium ions locate in the interstices of the structure, making it difficult to form a cross-linked frame, thus reduces the degree of polymerization. Compressive strength test shows a decrease for the specimens with the sodium content of 10.7%. The FTIR analysis indicates that the degree of polymerization is decreased as more sodium is introduced. Moreover, because sodium is relatively volatile, the specimens with high sodium content suffered a severe weight loss and deformation. As the temperature is raised to 700°C, amorphous geopolymer transforms to crystalline nepheline. After examined the microstructure and composition of the trilayer specimens, a sodium oxide layer was found at the interface. This interlayer enhances the adhesion strength between geopolymer and alumina substrate. The steady-state energy release rate measured from the four-point bending test also exhibited a positive correlation with the sodium content. A low thermal conductivity was observed for the trilayer specimens. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T13:26:41Z (GMT). No. of bitstreams: 1 ntu-104-R02527016-1.pdf: 4451602 bytes, checksum: 03a1982dc4c69f9295906fcc96ef4bd3 (MD5) Previous issue date: 2015 | en |
| dc.description.tableofcontents | CONTENTS
口試委員會審定書 # 誌謝 i 摘要 ii ABSTRACT iii CONTENTS v LIST OF FIGURES ix LIST OF TABLES xiv Chapter 1 Introduction 1 Chapter 2 Literature survey 3 2.1 Geopolymer 3 2.1.1 Criteria for synthesizing geopolymers 5 2.1.2 Structure of geopolymers 11 2.2 Geopolymer as coating or adhesive material 14 2.3 Interface properties 17 2.3.1 Crack tip characteristics 17 2.4 Adhesion strategies 21 2.5 Interface of ceramics 23 2.5.1 Adhesion strength 23 2.5.2 Adhesion measurement 25 2.5.3 Heat transfer 31 Chapter 3 Experimental Procedures 34 3.1 Starting materials 34 3.1.1 Alumina substrate 34 3.1.2 Geopolymer precursors 35 3.2 Geopolymer preparation 36 3.3 Microstructure examination 40 3.4 Joining process 42 3.5 Compressive strength test 43 3.6 Four-point bending test 44 3.7 Thermal conductivity measurement 46 Chapter 4 Results 48 4.1 Raw materials 48 4.1.1 Alumina substrate 48 4.1.2 Geopolymer precursors 49 4.2 Observation of geopolymer bulks 51 4.3 Weight change and size change 56 4.4 Fourier transform infrared spectroscopy analysis 60 4.5 Compressive strength test 65 4.6 Phase examination 66 4.7 Four-point bending test 71 4.8 Microstructure observation on the joint 75 4.9 Thermal diffusivity measurement 81 Chapter 5 Discussion 83 5.1 Factors affecting the structure of geopolymers 83 5.1.1 Dimension changes after heating 83 5.1.2 Chemical bonds 85 5.1.3 Compressive strength 88 5.2 Formation of secondary phases 91 5.2.1 Phase transformations 91 5.2.2 Sodium carbonate 93 5.2.3 Sodium oxide 94 5.3 Fracture behavior 96 5.3.1 Fracture process 96 5.3.2 Adhesion strength 97 5.3.3 Possible error in steady-state energy release rate 98 5.3.4 Fracture origin 100 5.4 Thermal conductivity 101 Chapter 6 Conclusions 103 Chapter 7 Future works 105 REFERENCES 107 | |
| dc.language.iso | en | |
| dc.title | 偏高嶺土基無機聚合物及其應用於接合氧化鋁之研究 | zh_TW |
| dc.title | Study on Metakaolin-Based Geopolymer and Its Use on Joining Alumina | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 104-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 鄭大偉,楊聰仁 | |
| dc.subject.keyword | 無機聚合物,氧化鋁,接合,界面強度,熱傳導係數, | zh_TW |
| dc.subject.keyword | Geopolymer,Al2O3,Bonding,Interfacial strength,Thermal conductivity, | en |
| dc.relation.page | 115 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2016-03-10 | |
| 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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