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J. Korean Ceram. Soc. > Volume 42(4); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(4): 260.
doi: https://doi.org/10.4191/kcers.2005.42.4.260
용융금속 프로브용 규조토 내열보호관의 제조 및 특성연구
이만업, 정학재, 이교운
(주)우진 계측기술연구소
Study on Characteristics and Manufacture of Heat-Resisting Diatomite Protection Tube for Probe Used in Steelmaking Process
Man-Eob Lee, Hak-Jae Chung, Kyo-Woon Lee
Research Institute of Measuring Technology, Woojin Inc.
A heat-resisting diatomite protection tube, using diatomite as a main component, was manufactured through an extrusion molding of ceramic slurry in different component ratios. And its mechanical strength, carbon analysis and microstructural non-homogeneity were investigated. After fixing $60wt%$ of porous diatomite whose particle size was $50~100;{mu}m$, the optimum mixture ratio with composition variables by changing $1;wt%$ of each component that was silica sol$(4.3~7.3;wt%)$ as an inorganic binder, CMC (Sodium CarboxyMethyl Cellulose $(6~9;wt%)$) as an organic binder and paper powder$(4.7~7.7;wt%)$ was obtained. As a result of the investigation on a composition containing $60;wt%$ diatomite, $5.3;wt%$ silica sol, and $7;wt%$ CMC, a heat-resisting protection tube that could be used as a molten steel probe for measuring the temperature and components of molten steel was developed. The bending strength, compressive strength, and elastic modulus of the protection tube developed, that contained $le2.3;wt%$ carbon, were 7.1 MPa, 7.5 MPa, and 1090 MPa, respectively.
Key words: Heat-resisting protection tube, Diatomite, CMC, Extrusion molding
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