표제지
목차
국문요약 9
Abstract 10
제1장 서론 11
1.1. 연구배경 11
1.2. 연구현황 12
제2장 이론적 배경 13
2.1. 이론적 배경 13
2.1.1. 루프 히트파이프 13
2.1.2. 분말야금 17
2.1.3. 미세 다공성 소결윅 21
2.1.4. 소결 23
제3장 실험방법 29
3.1. 미세 다공성 소결윅의 제작 29
3.1.1. 원재료의 선정 31
3.1.2. 금속분말의 충진 및 성형 36
3.1.3. 소결 및 시편제작 38
3.1.4. 미세 다공성 소결윅의 제작 42
3.2. 성형 및 소결 장치 44
3.3. 물리적 특성 분석 48
3.3.1. 기공률 및 기공크기 48
3.3.2. 투과도 51
3.3.3. 미세구조관찰 53
3.3.4. 열 성능시험 54
제4장 결과 및 고찰 59
4.1. 물리적 특성평가 59
4.2. 열 성능평가 74
제5장 결론 76
Reference 78
Table 1. Domestic and Overseas Research Status. 12
Table 2. Processing of sintered nickel wick. 30
Table 3. Characteristics of T255™ nickel powder. 32
Table 4. Specification of metal sintered wick 42
Table 5. Experimental condition by forming pressure and sintering... 45
Table 6. Conditions for Thermal Performance Test. 54
Table 7. Position of thermocouple attachment. 57
Table 8. Average permeability results by sintering temperature and... 60
Table 9. Pore size by molding pressure and sintering temperature 63
Table 10. Porosity by molding pressure and sintering temperature 68
Table 11. Transition Temperature change table according to heat load... 74
Fig. 1. First CPL conceptual diagram. 15
Fig. 2. First LHP conceptual diagram. 16
Fig. 3. Variety of powder metallurgy... 19
Fig. 4. Powder metallurgy processing. 20
Fig. 5. Photograph of fine porous sintered wick. 22
Fig. 6. Stage of solid state sintering. 26
Fig. 7. Schematic illustration of two spherical particles sintering together... 27
Fig. 8. Schematic diagrams of the pore structure changes during sintering. 28
Fig. 9. Graph of particle size analysis with Cilas 1064 liquid analyzer. 33
Fig. 10. Photograph of Fisher Sub sieve Sizer. 34
Fig. 11. SEM photograph of T255™ nickel powder. 35
Fig. 12. Cylinder type urethane mold for filling metal powder. 37
Fig. 13. Analytical specimens and drawing. 39
Fig. 14. Lathe machine for analysis specimen production. 40
Fig. 15. Wick surface comparison according to lathe processing conditions... 41
Fig. 16. Drawing of fine porous sintered wick. 43
Fig. 17. Cold Isostatic Press and schematics. 45
Fig. 18. Gas sintering device. 46
Fig. 19. Graph of sintering temperature condition. 47
Fig. 20. Porosity measure device and structure diagram 50
Fig. 21. Schematic diagram of the permeability measurement. 51
Fig. 22. Device of the permeability measurement. 52
Fig. 23. Scanning Electron Microscope device and structure diagram. 53
Fig. 24. LHP system configuration diagram. 56
Fig. 25. LHP Ass'y and Sectional view of the fine porous sintered wick... 58
Fig. 26. Permeability graph by sintering temperature and molding... 62
Fig. 27. Pore size graph by molding pressure and sintering temperature. 67
Fig. 28. Porosity graph by molding pressure and sintering temperature. 69
Fig. 29. Relationship between porosity and pore size and permeability... 71
Fig. 30. SEM photograph of manufacturing conditions. 73
Fig. 31. Graph of transient temperature variation according to heat load... 75