DOI QR코드

DOI QR Code

Study on the Corrosion Characteristics in the Slag Line of SEN Oxide Refractory

산화물계 SEN내화물의 슬래그 라인부 침식특성 연구

  • Sung, Young Taek (School of Nano & Advanced Materials Engineering, Changwon National Univ.) ;
  • Son, Jeong Hun (School of Nano & Advanced Materials Engineering, Changwon National Univ.) ;
  • Lee, Sung Seok (New Materials Research Department Senior Researcher, RIST) ;
  • Bae, Dong Sik (School of Nano & Advanced Materials Engineering, Changwon National Univ.)
  • Received : 2013.12.21
  • Accepted : 2014.01.06
  • Published : 2014.01.27

Abstract

The corrosion resistance of submerged entry nozzle (SEN) materials were investigated for high-class steel manufacturing. Composite samples were fabricated by mixing $ZrO_2$, $Al_2O_3$, MgO, mullite, spinel, and carbon. The raw materials were mixed with attrition milling, compacted in a uniaxial pressure of 200MPa and calcined at $1000^{\circ}C$ for 3 h in $N_2$ atmosphere. The bulk density and apparent porosity of the calcined samples were measured by the liquid displacement method in water using Archimedes's principle. The corrosion resistance of the samples were measured by cup test with mold powder at $1550^{\circ}C$ for 2 h. The microstructure and elemental analysis of samples were observed by scanning electron microscopy (SEM), energy dispersive spectrum (EDS), and X-ray diffraction pattern (XRD). The XRD result shows that the starting raw materials were crystalline phase. The microstructure of fabricated specimen was investigated before and after corrosion tests at $1000^{\circ}C$ and $1550^{\circ}C$ for 2h. $ZrO_2$-C composite showed good resistance in the slag corrosion test. Among the composite oxide materials, $ZrO_2-Al_2O_3$-C and $ZrO_2$-MgO-C showed better resistance than $ZrO_2$-C in the slag corrosion test. The diameter variation index of $ZrO_2$-C refractory was 16.1 at $1000^{\circ}C$ for 2 h. The diameter variation index of the $ZrO_2-Al_2O_3$-C refractory was larger than that of the $ZrO_2$-C refractory at $1550^{\circ}C$ for 2 h.

Keywords

References

  1. K. Okamoto, T. Nakamura and M. Kondo, Iron & Steel Engineer, Dec., 47 (1982).
  2. D. Apelian and W. L. McCauley, I & SM, Nov., 28 (1980).
  3. A. W. Cramb and Byrne, I & SM, May, 27 (1986).
  4. R. V. Branion, I & SM, Sept. 41 (1986).
  5. W. L. McCauley and M. K. Koul, 5th intern. Iron and steel Congress, Steelmaking proceedings, Washington D. C., 69, 87 (1986).
  6. G. J. Bayly, Industrial Heating, Aril, 18 (1984).
  7. R. Stevens, Zirconia and Zirconia Ceram., Magnesium Elektron Ltd. (1986).
  8. A. M. Alper ed., High Temperature Oxides Part II, Academic press, New York, 5 (1970).
  9. S. Sunwoo, H. Kim and J. K. Lee, J. Kor. A. Cryst. Growth., 10(3), 226 (2000).
  10. S. H. Cheon, H. S. Kong, B. S. Jun, J. Kor. Ceram. Soc., 41(9), 657 (2004). https://doi.org/10.4191/KCERS.2004.41.9.657
  11. I. S. Kim, S. H. Kim, J. S. Park, J. Y. Kang, K. H. Lee, and B. H. Lee, J. Kor. Ceram. Soc., 38(3), 238 (2001).
  12. M. K. Cho and G. G. Hong, J. Kor. Ceram. Soc., 36(4), 410 (1999).