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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 段維新(Wei-Hsing Tuan) | |
| dc.contributor.author | Chiao-Wei Cheng | en |
| dc.contributor.author | 鄭喬瑋 | zh_TW |
| dc.date.accessioned | 2021-06-17T00:13:14Z | - |
| dc.date.available | 2017-07-20 | |
| dc.date.copyright | 2012-07-20 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-07-09 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65836 | - |
| dc.description.abstract | 3mol%Y2O3-stabilized ZrO2/20wt%Al2O3 (YSZ/Al2O3)係藉由20wt%Al2O3第二相散佈於3YSZ中，所發展的陶瓷基複合材料，展現了相當優異的機械性質。已知ZrO2的微結構及相穩定性和添加之溶質有相當的關係，本研究係藉由添加微量NiO，控制ZrO2的微結構以及相變化，更進一步提升YSZ/Al2O3的機械性質。利用無壓燒結YSZ/Al2O3/NiO複合材料，在1600°C可達緻密化，再研究NiO的添加對於複合材料之相變化、微結構以及機械性質的影響。另外，也進行了微量NiO對於YSZ/Al2O3熱傳導性質的研究。
本研究中，Ni2+固溶於ZrO2晶格中，幫助了YSZ和YSZ/Al2O3複合材料的燒結緻密化。對於ZrO2高溫相(立、正方晶相)的穩定性而言，除了複合材料中內含的Y2O3以外，NiO可作為額外的穩定劑，固溶至ZrO2之晶格中進行原子置換，促使氧空缺的生成，幫助高溫相的穩定。然而，在燒結時，NiO可影響Y2O3在ZrO2中的重新分配，更進一步影響了正方晶相ZrO2的穩定性。另外，研究發現，NiO微量添加並固溶於晶格中，可以幫助YSZ/Al2O3複合材料的晶粒成長。在相穩定性以及晶粒大小的改變下，NiO的添加，確實可以更進一步地提升YSZ/Al2O3複合材料的機械性質。 | zh_TW |
| dc.description.abstract | Some ceramic matrix composites exhibit excellent mechanical properties. The 3mol% Y2O3-stabilized ZrO2/20wt%Al2O3 (YSZ/Al2O3) composite is one of these composites. To further enhancement the mechanical properties of ceramics, the formation of solid solution could be employed to control the microstructure and phase transformation of ZrO2. In the present study, a small amount of NiO was added into YSZ/Al2O3 composite as a second stabilizer to increase the concentration of oxygen vacancies. The YSZ/Al2O3/NiO composites were then prepared using the pressureless sintering at 1600°C to achieve full densification. Several analyses were conducted to investigate the influence of NiO addition on the phase transition and microstructure evolution. The fracture toughness and flexural strength of YSZ/Al2O3/NiO composites were then evaluated. Furthermore, the thermal conductivity of composite was determined.
The Ni2+ ion could act as a sintering-aid, promoting the densification of YSZ and YSZ/Al2O3 composite. It is found that NiO not only provides extra oxygen vacancies but also increases the redistribution of Y2O3 during sintering. The phase stability of ZrO2 is thus affected. The grain growth of YSZ/Al2O3 composite could also be promoted by the addition of Ni2+ solutes. Because the microstructure and phase stability is affected significantly, the mechanical properties could be further enhanced through the addition of a small amount NiO. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T00:13:14Z (GMT). No. of bitstreams: 1 ntu-101-R99527040-1.pdf: 8264789 bytes, checksum: 72296bbfba24f1e76699abf2038ab29d (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | Chapter 1 Introduction 1
Chapter 2 Literature Survey 3 2-1 Zirconia 3 2-1-1 Phases of Zirconia 3 2-1-2 Yttria-Stabilized Zirconia 4 2-1-3 Size Dependence 6 2-1-4 Phase Separation 9 2-1-5 Grain Growth 11 2-1-6 Toughening Behaviour 12 2-1-7 Strengthening Behaviour 14 2-2 YSZ/20wt%Al2O3 Composite 25 2-2-1 Strengthening Behaviour 25 2-2-2 Toughening Behaviour 26 2-3 YSZ/NiO System 30 2-3-1 Solid Solution 30 2-3-2 Phase Stability 31 2-3-3 Densification and Grain Growth 32 2-3-4 Mechanical Properties 34 Chapter 3 Experimental Procedures 37 3-1 Preparation of Specimens 37 3-1-1 Materials 37 3-1-2 Powder Mixture 37 3-1-3 Sintering Conditions 38 3-2 Thermo-Mechanical Analysis 39 3-3 Characterization of Sintered Specimens 40 3-3-1 Phase Identification 40 3-3-2 Quantitative Analysis 40 3-3-3 Density Measurement 41 3-3-4 Microstructure Observation 41 3-3-5 Electron Probe Microanalysis 42 3-4 Mechanical Properties Measurement 44 3-4-1 Young’s Modulus 44 3-4-2 Flexural Strength 44 3-4-3 Fracture Toughness and Hardness 45 3-5 Thermal Conductivity Measurement 47 Chapter 4 Results 50 4-1 YSZ/20wt%Al2O3 50 4-1-1 Phase Identification and Quantitation 50 4-1-2 Densification 51 4-1-3 Microstructure Observation 52 4-1-4 Mechanical Properties 53 4-2 YSZ/NiO 59 4-2-1 Phase Identification and Quantitation 59 4-2-2 Densification and Microstructure Observation 59 4-2-3 Flexural Strength 60 4-3 YSZ/20wt%Al2O3/NiO 64 4-3-1 Phase Identification and Quantitation 64 4-3-2 Densification 67 4-3-3 Microstructure Observation 68 4-3-4 Distribution of Stabilizer 70 4-3-5 Mechanical Properties 71 4-3-6 Thermal Conductivity 73 Chapter 5 Discussion 88 5-1 Effect of Sintering Temperature on 3YSZ/Al2O3 88 5-1-1 Phase Stability and Grain Growth 88 5-1-2 Densification 91 5-1-3 Mechanical Properties 93 5-2 Effect of NiO Addition on 3YSZ/Al2O3 100 5-2-1 Densification 100 5-2-2 Redistribution of Y2O3 and Cubic-Tetragonal Phase Separation 102 5-2-3 Grain Growth 105 5-2-4 Tetragonal-Monoclinic Transformation 108 5-2-5 Mechanical Properties 110 5-2-6 Thermal Conductivity 114 Chapter 6 Conclusions 124 Future Work 126 Reference 127 | |
| dc.language.iso | en | |
| dc.subject | 強度 | zh_TW |
| dc.subject | 破壞韌性 | zh_TW |
| dc.subject | 相變化 | zh_TW |
| dc.subject | 相穩定性 | zh_TW |
| dc.subject | 氧化鋯/氧化鋁複合材料 | zh_TW |
| dc.subject | 相分離 | zh_TW |
| dc.subject | 晶粒成長 | zh_TW |
| dc.subject | strength | en |
| dc.subject | phase separation | en |
| dc.subject | grain growth | en |
| dc.subject | phase stability | en |
| dc.subject | phase transformation | en |
| dc.subject | fracture toughness | en |
| dc.subject | zirconia/alumina composite | en |
| dc.title | 添加氧化鎳對釔安定氧化鋯/氧化鋁複合材料之燒結行為及機械性質研究 | zh_TW |
| dc.title | Effect of NiO Addition on the Sintering Behaviour and Mechanical Properties of YSZ/Al2O3 Composite | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 周振嘉(Cheng-Chia Chou),陳錦毅(Chin-Yi Chen),施劭儒(Shao-Ju Shih) | |
| dc.subject.keyword | 氧化鋯/氧化鋁複合材料,相分離,晶粒成長,相穩定性,相變化,破壞韌性,強度, | zh_TW |
| dc.subject.keyword | zirconia/alumina composite,phase separation,grain growth,phase stability,phase transformation,fracture toughness,strength, | en |
| dc.relation.page | 139 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-07-10 | |
| 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 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-101-1.pdf 未授權公開取用 | 8.07 MB | Adobe PDF |
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