Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Kinetics and Mechanism of Corrosion of ρ-alumina Bonded Alumina Castable by Molten Slag

ρ-알루미나결합 알루미나 캐스터블의 용융슬래그에 의한 침식기구

  • 천승호 (경남대학교 신소재공학부) ;
  • 전병세 (경남대학교 신소재공학부)
  • Published : 2003.10.01
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Abstract

The Corrosion behavior of the matrix of the $\rho$-alumina bonded alumina vibrated castable was, on the basis of Jabsen's theory, elucidated by use of the Kingery's reaction mechanism. Corrosion of the matrix during induction period was controlled by the molecular diffusion. The temperature dependence of activation process is well established by the Arrhenius plots. The difference of Ca concentration between slag and interface is 23.2%, which causes a driving force of the materials transfer. The extent of the corrosion of the matrix is more deeper than that of the sintered mullite, but the corrosion mechanism can be well employed as the reaction mechanism proposed by the Kingery. The life time of the castable may be well estimated by the corrosion mechanism of Kingery.

$\rho$-알루미나 결합 진동성형용 알루미나 캐스터블 내화물의 매트릭스부분과 용응 슬래그와의 침식거동을 젭센(Jabsen)이 주장한 이론을 기초로 하고 킹거리(Kingery)가 제안한 반응 기구를 통해 규명하였다. 매트릭스 부분의 초기침식이 분자확산거동에 의하여 지배되며, 아레니우스 관계식과 잘 일치하고 있어 온도의존성 활성화 과정으로 받아들 수 있다. 슬래그와 경계층의 Ca 농도차이가 23.2%로서 경계층을 형성하기 위한 물질이동의 구동력이 되었다. 매트릭스의 침식정도가 뮬라이트 소결체보다 심하지만 킹거리의 침식반응 기구와 잘 일치하고 있어 캐스터블의 수명예측이 가능하다.

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References

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