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Polycarbosilane 전구체가 탄소섬유/SiC 복합재료의 물성에 미치는 영향

The Effects of Polycarbosilane Precursor on the Properties of Carbon-Fiber/SiC Composites

김진구 이명천 김홍범

Kim JG Lee MC Kim HB

HWAHAK KONGHAK, June 1998, 36(3), 434-437(4), NONE

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Abstract

섬유강화 세라믹 복합재료의 바인더로서 갖추어야 할 물성으로는 소결후 세라믹수율과 밀도가 높아야 하며 섬유사이로 잘 침투해 들어갈 수 있어야 한다. 이를 위하여 본 연구에서는 비닐형 polycarbosilane(VPS) 전구체를 합성하여 탄소섬유/SiC 복합재료의 바인더로 사용하였다. 또한 이 바인더의 효과를 알아보기 위해 기존의 바인더인 β-polycarbosilane(β-PCS) 전구체를 사용하여 물성을 비교하여 보았고 최적의 바인더를 만들기 위해 VPS와 β-PCS가 혼합된 바인더를 사용하여 또한 물성을 비교하여 보았다. 이 결과 본 연구에서 합성한 VPS는 용매에 잘 녹아 슬러리침투(slurry infiltration) 공정에 유리하고 섬유사이로 잘 스며들어 기존의 용융침투형 β-PCS 바인더에 비해 굴곡강도, 굴곡탄성률, 최종굴곡연신율 그리고 밀도면에서 높은 값을 보였다. 그러나 VPS는 β-PCS보다 세라믹수율이 낮은 문제점이 있어 이를 보완하기 위해 β-PCS를 적당량 혼합하여 제조한 결과 VPS만을 사용했을 때보다 더 좋은 물성을 보였다.

The binder for the fiber-reinforced ceramic composites should have high ceramic yield and density after sintering and should penetrate into the fibers easily. For this purpose, vinyl polycarbosilane precursor was synthesized for the carbon-fiber/SiC composite as a binder. To investigate the effects of VPS, the traditional β-PCS was also used to compare material properties. And also, to find the optimum properties of binder, VPS was blended with β-PCS. Because the synthesized VPS is soluble in solvent well, it has advantages in slurry infiltration process and can penetrate into fibers easily as well as it has high ceramic density because of its cross-linkable side-chain. As a result, the composites made using VPS have higher flexural strength, flexural modulus, ultimate flexural strain and density compared to those made using β-PCS. VPS, however, has a lower ceramic yield than the β-PCS. Therefore, better material properties were earned when we used VPS mixed with proper quantities of β-PCS.

Keywords

Carbon-Fiber/SiC Polycarbosilane Composite Ceramic

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