표제지
목차
國文要略 12
제1장 서론 14
1.1. 연구 배경 14
1.2. 연구 목적 및 내용 16
제2장 이론적 배경 18
2.1. 팽창 가능 흑연(Expandable Graphite)의 구조 및 특성 18
2.2. 팽창 가능 흑연의 팽창 원리 및 팽창 메커니즘 20
2.2.1. GIC의 삽입 20
2.2.2. 팽창 메커니즘 22
2.3. 팽창 가능 흑연의 제조 방법 24
2.3.1. 건식 방법 24
2.3.2. 습식 방법 27
제3장 실험방법 29
3.1. 실험 재료 29
3.2. 실험 장비 30
3.3. 실험 과정 31
3.3.1. 팽창 가능 흑연의 제조과정 31
3.3.2. 제조된 팽창 가능 흑연의 시험 진행 40
제4장 실험결과 43
4.1. 팽창 가능 흑연의 열처리 온도에 따른 팽창 특성 43
4.2. H₂SO₄-HNO₃ 샘플의 삽입제 중량별 팽창률 측정결과 49
4.3. GIC 종류별 제조된 팽창 가능 흑연의 팽창률 측정결과 53
4.4. Particle size별 제조된 팽창 가능 흑연의 팽창률 측정결과 55
4.5. GIC 종류별 팽창 가능 흑연의 TG-DTA 분석 결과 62
제5장 결론 66
REFERENCES 68
ABSTRACT 71
Table 1. Physical properties of expandable graphite by type. 20
Table 2. Physical properties of graphite by type. 29
Table 3. Changes in interlayer distance according to heat treatment temperature. 43
Table 4. BET Analysis Results for Heat Treatment Temperature of Expanded Graphite. 47
Table 5. Tap-testing specific volume and expansion magnification of expanded graphite according to weight change of implantation agent. 49
Table 6. The XRD Peak attenuation rate of expanded graphite by sulfuric acid weight type and the calculated interplanar distance d value. 53
Table 7. Tap-testing specific volume and expansion magnification of expanded graphite according to GIC type. 55
Table 8. Expansion magnification of expandable graphite according to the particle size of graphite. 57
Table 9. TG-DTA analysis results of expandable graphite produced by GIC type. 65
Fig. 1.1. Expanded graphite and SEM photographs. 14
Fig. 1.2. Expanded graphite used as heat-dissipating products such as flame-retardant sheets and gaskets. 15
Fig. 2.1. Graphite structure and distance by carbon atom. 18
Fig. 2.2. Rapid expansion of expandable graphite. 19
Fig. 2.3. Schematic diagram of staging phenomenon of expandable graphite. 21
Fig. 2.4. GIC Insertion mechanism through sulfuric acid mixture. 23
Fig. 2.5. Expansion mechanism of expandable graphite by vaporization of GIC. 25
Fig. 2.6. Schematic diagram of the dry method manufacturing reactor for the manufacture of expandable graphite. 26
Fig. 2.7. Schematic diagram of the process of manufacturing expandable graphite by wetting method. 28
Fig. 3.1. Ice bath installation for strong acid mixing. 32
Fig. 3.2. Mixing of strong acid solution through a glass rod. 32
Fig. 3.3. The appearance of the stirred acid mixture. 33
Fig. 3.4. Stirring of acid mixture and graphite. 35
Fig. 3.5. Side view of stirring of acid mixture and graphite. 36
Fig. 3.6. Filtration of expandable graphite using pressurized filtration equipment. 38
Fig. 3.7. Expandable graphite obtained by acid type. 39
Fig. 3.8. Schematic diagram showing the tab-testing specific volume measurement process of expanded graphite. 42
Fig. 4.1. SEM photographs of normal graphite at room temperature. 44
Fig. 4.2. SEM photographs of expandable graphite at room temperature 44
Fig. 4.3. SEM photographs of expanded graphite at 300℃. 45
Fig. 4.4. SEM photographs of expanded graphite at 500℃. 45
Fig. 4.5. SEM photographs of expanded graphite at 700℃. 46
Fig. 4.6. SEM photographs of expanded graphite at 900℃. 46
Fig. 4.7. Graphs of BET, total pore volume, and average pore diameter according to heat treatment temperature. 48
Fig. 4.8. Graph of expansion magnification change of expanded graphite according to weight change of sulfuric acid. 50
Fig. 4.9. XRD measurement results of samples by natural graphite (N.G) and sulfuric acid weight type. 52
Fig. 4.10. Expansion volume of expanded graphite by type of GIC measured by measuring cylinders. 54
Fig. 4.11. Measurement of Expansion Volume of Expandable Graphite by Particle Size and GIC Type using measuring Cylinders. 58
Fig. 4.12. SEM photographs of expandable graphite made from 30 mesh and 50 mesh graphite. 59
Fig. 4.13. SEM photographs of expanded graphite made from 30 mesh and 50 mesh graphite. 60
Fig. 4.14. Graph of expansion magnification of expandable graphite according to GIC type and particle size of graphite. 61
Fig. 4.15. TGA measurement results of expandable graphite produced by sulfuric acid-nitric acid mixture. 63
Fig. 4.16. TGA measurement results of expandable graphite produced by hydrochloric acid-nitric acid mixture. 63
Fig. 4.17. TGA measurement results of expandable graphite produced by sulfuric acid-ammonium persulfate mixture. 64
Fig. 4.18. TGA measurement results of expandable graphite produced by perchloric acid-permanganate potassium mixture. 64