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Development of tungsten sintering technology for fusion applications : 핵융합로용 텅스텐 대면소재의 소결 기술 개발
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 한흥남 | - |
| dc.contributor.author | Hyun-Min Sung | - |
| dc.date.accessioned | 2017-07-14T03:13:49Z | - |
| dc.date.available | 2017-07-14T03:13:49Z | - |
| dc.date.issued | 2017-02 | - |
| dc.identifier.other | 000000140891 | - |
| dc.identifier.uri | https://hdl.handle.net/10371/123395 | - |
| dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2017. 2. 한흥남. | - |
| dc.description.abstract | In this study, sintering conditions to obtain high-density sintered tungsten materials with thermal stability were studied utilizing spark plasma sintering method (SPS). Sintering factors such as sintering powder condition, temperature, time, pressure and process were independently controlled to figure out their effects. The microstructure and properties of samples sintered under each controlled condition were feedbacked to obtain optimized sintering conditions. The thermal stabilities of tungsten samples were evaluated by high heat flux (HHF) test. The microstructures of sintered samples after HFF test were compared with those of the Plansee ITER grade tungsten samples after HHF test. It was revealed that the high-density sintered tungsten samples fabricated by SPS possess better microstructural stability and mechanical property than Plansee ITER grade tungsten samples under elevated temperature conditions. Additionally, improvement of mechanical properties of tungsten materials were also investigated. | - |
| dc.description.tableofcontents | 1. Introduction 1
2. Theoretical Background 8 2.1 Fusion Reactor and Plasma Facing Material 8 2.1.1 Fusion Reaction and Tokamak 8 2.1.2 Plasma Facing Material 14 2.1.3 Tungsten as Plasma Facing Material 18 2.2 Spark Plasma Sintering 20 3. Experimental 24 3.1 Powder Preparations 24 3.2 Spark Plasma Sintering 27 3.3 Sample Preparations 33 3.4 High Heat Flux Test 35 3.5 Microstructure Observations and Property Measurements 37 3.6 High Temperature Compression Test 39 4. Results and discussion 42 4.1 Fabrication process and the Microstructure of ITER Grade W Material 42 4.2 Effect of Sintering Factors in Spark Plasma Sintering 47 4.2.1 Effect of the Powder Particle Size 48 4.2.2 Effect of the Sintering Temperature 51 4.2.3 Effect of the Sintering Time 53 4.2.4 Effect of the Sintering Process 55 4.2.5 Effect of the Heating Rate 57 4.2.6 Effect of the H2 Reduction 59 4.3 Optimized Sintering Conditions for High Densification 63 4.4 Thermal stability of W samples 68 4.5 Improvement of Mechanical Property of the Sintered Samples 83 5. Conclusions 94 6. References 96 국문초록 101 | - |
| dc.format | application/pdf | - |
| dc.format.extent | 4593340 bytes | - |
| dc.format.medium | application/pdf | - |
| dc.language.iso | en | - |
| dc.publisher | 서울대학교 대학원 | - |
| dc.subject | Plasma-facing materials | - |
| dc.subject | Tungsten | - |
| dc.subject | Spark plasma sintering | - |
| dc.subject | High heat flux test | - |
| dc.subject | Thermal stability | - |
| dc.subject | Electron backscatter diffraction and Mechanical property. | - |
| dc.subject.ddc | 620 | - |
| dc.title | Development of tungsten sintering technology for fusion applications | - |
| dc.title.alternative | 핵융합로용 텅스텐 대면소재의 소결 기술 개발 | - |
| dc.type | Thesis | - |
| dc.contributor.AlternativeAuthor | 성현민 | - |
| dc.description.degree | Master | - |
| dc.citation.pages | 101 | - |
| dc.contributor.affiliation | 공과대학 재료공학부 | - |
| dc.date.awarded | 2017-02 | - |
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