Article
  • Influence of Oxidation Inhibitor on Carbon-Carbon Composites: 5. Studies on Anti-oxidation Properties of the Composites
  • Park SJ, Seo MK, Cho MS, Lee JR
  • 산화억제제 첨가에 의한 탄소/탄소 복합재료의 물성에 관한 연구: 5. 탄소/탄소 복합재료의 내산화성 연구
  • 박수진, 서민강, 조민석, 이재락
Abstract
Phenolic resin used as a precursor of carbonized matrix for carbon-carbon composites was modified by addition of molybdenum disilicide(MoSi2) in various concentrations of 0, 4, 12 and 20% by weight to improve the anti-oxidation properties of the composites. The green body was manufactured by a prepreg method and was submitted to carbonization up to 1100℃. In this work, the oxidation behavior of carbon-carbon composites with MoSi2 as an oxidation inhibitor was investigated at the temperature range of 600-1000℃ in an air environment. The carbon-carbon composites with MoSi2 showed a significantly improved oxidation resistance due to both the reduction of the porosity formation and the formation of mobile diffusion barrier for oxygen when compared to those without MoSi2. Carbon active sites should be blocked, decreasing the oxidation rate of carbon. This is probably due to the effect of the inherent MoSi2 properties, resulted from a formation of the protective layer against oxygen attack in the composites studied.

탄화 매트릭스의 전구체로 사용된 페놀수지에 세라믹 분말인 이규화몰리브덴(MoSi2)을 0.4, 12, 20%의 중량비로 각각 고르게 분산시켜, 여기에 PAN계 탄소섬유를 함침하여 프리프레고법을 이용하여 일방향 탄소섬유/페놀수지 복합재료를 제조하였으며, 이를 다시 탄화(1100℃)시켜서 일방향 탄소/탄소 복합재료를 제작하였다. 본 연구에서는 탄소/탄소 복합재료에 산화 억제제로 사용된 MoSi2의 첨가량에 따른 복합재료의 산화거동을 산화분위기 하 600∼1000℃의 온도범위에서 조사하였다. 그 결과, MoSi2를 함유한 탄소/탄소 복합재료는 복합재료 내의 기공 감소와 산소에 대한 유동 확산 방지막의 형성으로 인하여 카본 활성종이 방해를 받아 MoSi2를 함유하지 않은 것에 비해 산화속도가 감소되어 내산화성이 향상되었다. 이는 산소의 공격에 대한 보호층을 형성하는 MoSi2 고유의 특성에 따른 영향이라 사료된다.

Keywords: carbon-carbon composites; MoSi2; oxidation resistance; carbonization; brittle-to-ductile transition

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2000; 24(2): 237-244

    Published online Mar 25, 2000