인산형 연료전지 분리판용 천연흑연-불소수지계 복합재료의 흑연입도에 따른 전기비저항 변화

서지정보

ㆍ발행기관 : 한국재료학회 ㆍ수록지정보 : 한국재료학회지 / 27권 / 12호
ㆍ저자명 : 이상민, 백운경, 노재승, 김태진

목차

1. 서 론
2. 실험 방법
2.1 제조 방법
2.2 밀도 및 기공률 측정
2.3 배향도(Degree of Alignment)
2.4 전기비저항 및 굽힙강도 측정
3. 결과 및 고찰
3.1 밀도 및 기공률광학현미경(LV150
3.2 배향도(Degree of Alignment)
3.3 굽힙강도 및 전기비저항
4. 결 론
Acknowledgements
References

영어 초록

A composite material was prepared for the bipolar plates of phosphoric acid fuel cells(PAFC) by hot pressing a flake type natural graphite powder as a filler material and a fluorine resin as a binder. Average particle sizes of the powders were 610.3, 401.6, 99.5, and 37.7 μm. The density of the composite increased from 2.25 to 2.72 g/cm3 as the graphite size increased from 37.7 to 610.3 μm. The anisotropy ratio of the composite increased from 1.8 to 490.9 as the graphite size increased. The flexural strength of the composite decreased from 15.60 to 8.94MPa as the graphite size increased. The porosity and the resistivity of the composite showed the same tendencies, and decreased as the graphite size increased. The lowest resistivity and porosity of the composite were 1.99 × 10−3 Ωcm and 2.02 %, respectively, when the graphite size was 401.6 μm. The flexural strength of the composite was 10.3MPa when the graphite size was 401.6 μm. The lowest resistance to electron mobility was well correlated with the composite with lowest porosity. It was possible the flaky large graphite particles survive after the hot pressing process.

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