Cyclohexene을 첨가한 PIP 공정 사용 Cf/SiC 복합재의 고밀도화
Densification of Cf/SiC Composite Using PIP with Adding of Cyclohexene
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초록
탄소섬유강화 SiC기지상 복합재는 우수한 산화저항성과 우수한 열충격저항성을 가진다. 그리고 이런 특성들은 탄소섬유강화복합재가 고온구조재로서 응용케하였다. 본 연구에서는 Cf/SiC 복합재가 전구체 함침과 액상함침이 동반된 열분해공정, Cyclohexene을 사용한 화학기상 경화공정을 통해 제조되었다. 최종 제조된 Cf/SiC 복합재는 5회 함침을 통해 0.43 g/cm3 밀도를 갖는 탄소섬유 프리폼에서 1.76 g/cm3의 밀도값을 나타내고 있다. 그리고 산화저항성 특성면에서 Cf/SiC 복합재의 무게가 공기중 1400oC에서 6시간 유지 후에 81%가 남았다. 결과적으로 Cyclohexene을 사용한 화학기상 경화공정은 효과적으로 높은 치밀화와 증가된 산화저항성을 보이고 있다.
Abstract
Carbon fiber-reinforced SiC matrix composites have good oxidation resistance and thermal shock resistance. These properties have allowed the composites to be applied to high-temperature structures. In this study, Cf/SiC composites were fabricated via precursor infiltration and pyrolysis (PIP) process, including liquid phase infiltration and chemical vapor curing using cyclohexene. The final Cf/SiC composites, which have gone through the PIP process five times, showed a density of 1.79 g/cm3, as compared to a density of 0.43 g/cm3 for pre-densified bare carbon fiber preform. As for the oxidation resistance characteristics, the weight of Cf/SiC composite was maintained at 81% at 1400oC in air for 6 hours. Chemical vapor curing (CVC) using cyclohexene has shown to be an effective method to achieve high densification, leading to increased oxidation resistance.
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