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결과 내 검색 동의어 포함

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목차보기

표제지

목차

제1장 서론 10

제2장 이론적 배경 12

제1절 단열 창호의 종류 12

제2절 진공 단열 창호의 개념 15

제3장 Fabrication of Glass / Alumina Composite Using 3D Printing Process with Laser PBF 18

제1절 실험 과정 19

제2절 결과 및 토론 23

3.2.1. 저온 소성용 Glass Frit 특성 평가 23

3.2.2. Al₂O₃ / Glass frit Composite 소결체 특성 평가 29

3.2.3. Al₂O₃ / Glass frit Composite 3D 바이오 스케폴드 제작 37

제4장 A Study on the Characteristics Evaluation of Lead-free Bi₂O₃ Low Temperature Sealing Glass for Vacuum 39

제1절 실험 과정 41

제2절 결과 및 토론 44

4.2.1. Bi₂O₃-ZnO-B₂O₃계 저온 소성용 유리의 특성평가 44

4.2.2. 필러 Cordierite함량별 특성평가 57

4.2.3. Lead-free vacuum sealing material panel production 69

제5장 결론 72

참고문헌 74

발표논문 80

특허출원 81

학술발표 82

표목차

표 1. 단열창의 에너지 소비량 14

표 2. The thermal and particle size properties of the developed glass 28

표 3. Bi₂O₃-ZnO-B₂O₃-Cordierite composition table 46

그림목차

그림. 1. 단열창호의 예 13

그림. 2. 진공유리 에너지 감소량 그래프 16

그림. 2. 진공창호 단면 17

그림. 4. Density improvement mechanism of Glass / Al₂O₃ composite... 21

그림. 5. Process flow for the experiments of glass /... 22

그림. 6. (a) SEM images and (b) XRD result of glass frit 24

그림. 7. High Temp Microscope image of SiO₂ - B₂O₃ - RO glass frit... 26

그림. 8. optical microscope image of melt Glass frit using laser scanning 30

그림. 9. SEM image of the polished surface of Glass / Al₂O₃ Composite with... 32

그림. 10. (a) Density Results of sintered glass with Al₂O₃,... 34

그림. 11. XRD results of [xglass /(1-x)Al₂O₃)]composite With the range of... 36

그림. 12. (a) 3D scaffold manufactured by PBF process, (b) SEM image 38

그림. 13. Process flow for the experiments of Sealing Glass for Vacuum 43

그림. 14. Bi₂O₃-ZnO-B₂O₃ composition design 45

그림. 15. High-temperature microscope observation result by ZnO content in Bi₂O₃-ZnO-B₂O₃ 48

그림. 16. DSC results by ZnO content in Bi₂O₃-ZnO-B₂O₃ 50

그림. 17. Flow ability image results according to the change of ZnO content 52

그림. 18. Flow ability results according to the change of ZnO content 52

그림. 19. density results according to the change of ZnO content 54

그림. 20. SEM surface image by Bi₂O₃-ZnO-B₂O₃ content Before polishing at... 54

그림. 21. XRD graph results according to ZnO content in Bi₂O₃-ZnO-B₂O₃... 56

그림. 22. FT-IR results by ZnO content in Bi₂O₃-ZnO-B₂O₃ 56

그림. 23. Flow ability image results according to the change of Cordierite content 58

그림. 24. Flow ability results according to the change of Cordierite content 58

그림. 25. density results according to the change of Cordierite content 60

그림. 26. CTE value results according to the change of Cordierite content 62

그림. 27. DSC results by Cordierite content in Bi₂O₃-ZnO-B₂O₃ 64

그림. 28. XRD graph results according to Cordierite content in Bi₂O₃-ZnO-B₂O₃... 66

그림. 29. FRIR results by Cordierite content in Bi₂O₃-ZnO-B₂O₃ 66

그림. 30. (a), (b) amorphous TEM image / (c), (d), Cordierite TEM image 68

그림. 31. EDS analysis of cross section of vacuum sealing material and substrate glass.... 70

그림. 32. Vacuum panel manufacturing image 71

초록보기

제 3장 Fabrication of Glass / Alumina Composite Using 3D Printing Process with Laser PBF

Powder bed fusion (PBF) additive manufacturing is used to produce high-efficiency, high-density, and high-performance products. As the existing method was limited to metal materials, it was difficult to apply to ceramics with a high melting point. This study developed a composite material for PBF additive manufacturing in which Al2O3 was added to a glass material using laser melting. A mixture was prepared by adding black pigment for aiding laser light absorption and Al2O3 for improving strength to the glass frit. It was confirmed that the glass melted to form a composite when the glass frit-added mixture was irradiated with laser. In order to improve the sintering density, it was heat treated at 750℃ to synthesize a high-density glass frit composite. In the XRD analysis to confirm the reactivity of the glass frit and Al2O3, no reactions occurred in both phases and the glass was not crystallized. Moreover, high density of 97% or more compared to the theoretical density was secured. Mechanical properties were evaluated while changing the content of Al2O3 in the mixture. Manufacturing ceramic 3D structures using a glass material through PBF additive manufacturing is expected to reduce process cost, improve performance, add new functions, and create more added value.

제 4장 A Study on the Characteristics Evaluation of Lead-free Bi₂O₃ Low Temperature Sealing Glass for Vacuum

Among the energy losses of buildings, heat loss occurs about 30% through windows. Accordingly, it is urgent to develop a highly functional insulating window glass to minimize heat loss. An eco-friendly vacuum glass sealing agent was developed by removing lead components used in the manufacture of existing vacuum windows.

In the Bi₂O₃-ZnO-B₂O₃-based composition glass, the contents of Bi₂O₃ and ZnO were varied and mixed by ball-milling for 12h. After that, a glass composition was developed that can be melted at 1300˚ C and sintered at 450˚ C or less.

As a result of measuring the density of the developed glass, a density of 7.301 g/㎤ was confirmed to be more than 99% of the theoretical density, and as a result of SEM measurement, the surface density was also confirmed. The softening point, transition point, and coefficient of thermal expansion were measured by using DTA and CTE with a high temperature microscope. In addition, it was confirmed that the XRD and FTIR measurements did not crystallize.

The coefficient of thermal expansion was reduced by adding 3~15% cordierite as a filler to the developed Bi₂O₃-ZnO-B₂O₃ glass. As a result of density and SEM measurement, it was confirmed that the density was excellent, and the softening point, transition point, and coefficient of thermal expansion were confirmed by measuring DTA and CTE(7.53x10-6). As a result of XRD and FT-IR, it was confirmed that there was no reaction of the two phases as amorphous, and EDS and TEM were analyzed.

In conclusion, a lead-free, eco-friendly Bi₂O₃-ZnO-B₂O₃ glass sealing material for vacuum was developed. In the future, it is expected that lead-free products such as architecture, electronic devices, and home appliances will be commercialized.

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