Wear Mechanisum of Carbon Bearing BOF Refreactories

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J. Korean Ceram. Soc. > Volume 23(1); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(1): 51.

전로용 MgO-C질 내화벽돌의 손상요인

김의훈, 오영우¹, 이철수², 김종성³, 김종희⁴

표항종합제출(주) 기술연구소
¹표항종합제철(주) 기술연구소
²표항종합제철(주) 노재관리실
³삼화화성(주) 기술연구소
⁴한국과학기술원 재료공학과

Wear Mechanisum of Carbon Bearing BOF Refreactories

ABSTRACT

It was the first time the MgO-C brick was developed for the lining materials in the hot spots in electric are furnace in 1972. MgO-C brick is high registant to thermal and structural spalling. Futhermore for the reason that carbon is hard to react with slag and MgO is high fireproof MgO-C brick shows a high corrosion registance to slag attack compared with conventional basic refractories. Owing to their excellent properties the use of MgO-C refractories are being developed widely in the field of shaped refractories and even in that of monolithic refractories. In this paper the oxidation of carbon the infiltration of slag into the brick texture and effects of additions were investigated. The results obtained were as follows : 1) The use of fused MgO-clinker and high purity carbon as raw materials increased the corosion registance and hot modulus of rupture of MgO-C brick. 2) As the oxidation reaction of the carbon proceeded the slag infiltrated into the brick texture. And then the slag components reacted with the MgO grains and formed low melting point compounds particulary CaO.MgO.$SiO_2$ and 3CaO.MgO.$2SiO_2$ that resulted in the wear of the brick. 3) It is recongnized the Al, Si, $B_3C$ effects on the oxidation registant properties of MgO-C brick by contribu-ting to the decrease of permeability according to the formation of $Al_4C_3$, SiC, $B_2O_3$ and the decrease of open pores relating to the formation of MgO.Al2O3, $SiO_2$, 3MgO.$B_2O_3$ at the decarbonized layer.