The change in the open porosity of bulk graphite as a function of the uniaxial molding pressure during manufacturing is studied using artificial graphite powder. Subsequently, the graphite is impregnated to determine the effect of the open porosity on the impregnation efficiency and to improve the density of the final bulk graphite. Bulk graphite is manufactured with different uniaxial molding pressures after mixing graphite powder, which is the by-product of processing the final graphite products and phenolic resin. The bulk density and open porosity are measured using the Archimedes method. The bulk density and open porosity of bulk graphite increase as the molding pressure increases. The open porosity of molded bulk graphite is 25.35% at 30 MPa and 29.84% at 300 MPa. It is confirmed that the impregnation efficiency increases when the impregnation process is performed on a specimen with large open porosity. In this study, the bulk density of bulk graphite molded at 300 MPa is 11.06% higher than that before impregnation, which is the highest reported increase. Therefore, it is expected that the higher the uniaxial pressure, the higher the density of bulk graphite.

Abstract
1. 서 론
2. 실험 방법
    2.1. 원료 및 벌크흑연 제조
    2.2. 부피밀도와 열린기공의 기공률 측정
    2.3. XRD 측정
    2.4. 미세조직 관찰
3. 결과 및 고찰
    3.1. 원료 분석
    3.2. 부피밀도와 열린 기공의 기공률
    3.2. X-Ray diffraction 분석
    3.4. 함침 후 밀도 향상
4. 결 론
References

• 이상민(금오공과대학교 신소재연구소) | Sang-Min Lee (Advanced Material Research Center, Kumoh National Institute of Technology)
• 이상혜(금오공과대학교 신소재공학과) | Sang-Hye Lee (School of Materials Science and Engineering, Kumoh National Institute of Technology)
• 노재승(금오공과대학교 신소재공학과) | Jae-Seung Roh (School of Materials Science and Engineering, Kumoh National Institute of Technology) Corresponding Author