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이차원 구조(2D) 탄소섬유 보강 복합재의 탄화공정중 기질의 형태 변화
주혁종,윤병일,최돈묵,오인석,Joo, Hyeok-Jong,Yoon, Byeong-Il,Choi, Don-Muk,Oh, In-Seok 한국재료학회 1992 한국재료학회지 Vol.2 No.4
본 연구에서는 2D-woven fabric에 결합재로 페놀수지를 사용하여 성형한 CFRP의 탄화거동을 관찰하였다. TMA분석 결과 적층 두께방향에서는 365-37$0^{\circ}C$ 법선방향에서는 118-12$8^{\circ}C$ 에서 치수변화가 일어났다. 각 온도 구간별로 광학현미경으로 관찰한 결과 CFRP제조시 형성된 크랙이나 기공은 열처리온도에 따라 성장하였으며, 400-50$0^{\circ}C$ 부근에서 새로운 많은 크랙이 형성되었다. 기공률과 밀도가 400-50$0^{\circ}C$ 에서 급격히 변화한 것을 볼 때 이 구간에서 복합재 내부에서 크랙이 형성 및 성장하는 것을 알 수 있었다. 따라서 CFRP를 탄화할 때 승온속도를 구간별로 조절할 필요성이 있는 것으로 판단되었다. The carbonization behaviors of CFRP fabricated with 2D-woven fabric and matrix phenolic resin have been studied. The changes in dimension were observed in the temperature range of 365-37$0^{\circ}C$ in the thickness direction, 118-12$0^{\circ}C$ in the normal direction each other by TMA analysis. Observation with the optical microscope shows that the formed cracks and pores during the fabrication of CFRP were propagated with the increase of pyrolysis temperaure. New cracks and pores were formed in the pyrolysis temperature range of 400-50$0^{\circ}C$ In line with the formation and propagation of cracks, porosity was increased and density was decreased rapidly in the pyrolysis temperature range of from 40$0^{\circ}C$ to 70$0^{\circ}C$. Therefore heating rate in the carbonization process need to be controlled carefully by intervals.
오인석(In Seok Oh),인세진(Se Jin In),최돈묵(Don Mook Choi),이영석(Young Seak Lee),김정일(Jung Il Kim),주혁종(Hyeok Jong Joo) 대한공업교육학회 2000 대한공업교육학회지 Vol.25 No.1
The 4D preforms were made of both weaving and rod network types. Densified 4D CFRC was fabricated with coal tar pitch matrix through the process of pressure impregnation and carbonization(PIC). Each preform type was compared with combustion and thermal properties of 4D CFRC and investigated. In case the high heat treatment was up to 2300℃, the oxidation resistance of 4D CFRC was much increased. As a result of combustion test, the ablation resistance of 4D CFRC rose with the growing of density and heat treatment temperature(HTT). Therefore, to obtain better ablation resistance under the worse conditions such as high temperature, high HTT and densification are essential parameters.
석탄계 핏치로 부터 탄소/탄소 복합재를 제조하는 공정중 가압탄화의 효과
오인석,김정일,남윤선,주혁종,김성재,김광수,Oh, In-Seok,Kim, Jung-Il,Nam, Yun-Sun,Joo, Hyeok-Jong,Kim, Sung-Jae,Kim, Kwang-Soo 한국재료학회 1997 한국재료학회지 Vol.7 No.5
석탄계 핏치의 열처리 온도 및 압력에 따른 결정화도와 기공도 그리고 산화저항성 등을 관찰하였으며, hexagonal type 4D 탄소/탄소 복합재를 석탄계 핏치로 가압함침 및 탄화시킨 다음 가해준 압력이 고밀도화에 미치는 영향을 관찰하였다. 석탄계 핏치의 가압탄화 압력이 흑연화도에 크게 영향을 미치지 않았으며, 기공면적비에 있어서는 압력을 600bar로 상승시켜 줌으로써 상압 처리한 경우 보다 1.5배 정도 감소 하였다. $650^{\circ}C$까지 열처리하여 얻은 코우크스의 산화반응 개시온도는 처리압력이 증가함에 따라서 지연되었다. 탄소/탄소 복합재의 함침압력을 100bar에서 600bar로 상승시켜 줄 경우 밀도 증가율이 크게 향상 되었으며 기공도는 감소하였다.
주혁종,오인석,권호길,최돈묵 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2
An experimental study was performed to prepare the anaerobic acrylic adhesives with TEGDMA(Trietylene Glycol Dimethacrylate), acrylic acid, p-benzoquinnone and CTBN(Carboxyl Terminated Butadiene Nitrile) To characterize the anaerobic modifided acrylic adhesives, tensile shear adhesion strength, DSC, FT-IR, water resistance, chemicals resistance and oil resistance of adhesives were tested. The results obtained in this study could be summerized as follows; 1. Tensile adhesion shear strength was increased with increasing the adding amounts of p-benzoquinone up to 75kgf/㎠ when 0.163wt% added. 2. After a water resistance test for 72hrs, tensile shear adhension strength maintenance was dominant(about 72%) in the C-3 as compared with the others and alkaline solution resistance of adhesives was excellent on the whole as compare to acid solution. 3. The gasoline, light oil resistance of adhesives were very good enough that could be used in the field of mechanical connecting parts.