| Thermal Shock Behavior of Porous Nozzles with Various Pore Sizes for Continuous Casting Process |
| Ju-Young Kim, Sang-Hyeon Yoon, Yoon-Ho Kim1, Hee-Soo Lee |
School of Materials Science & Engineering, Pusan National University
1Engine Development Department Platform Development Division Technical Center, Daihatsu Motor Co., Ltd. |
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| ABSTRACT |
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Thermal shock behavior of porous ceramic nozzles with various pore sizes for continuous casting process of steel was investigated in terms of physical properties and microstucture. Porous nozzle samples with a composition of $Al_2O_3$-$SiO_2$-$ZrO_2$ were fabricatedby adding various sizes of graphite as the pore forming agent. As the graphite size increased from 45~75 to 150~180 ${mu}m$, both the resulting pore size and the flexural strength also increased. A thermal shock test was carried out at temperatures (${Delta}$T) of 600, 700, 800, and 900$^{circ}C$. Microstructure analysis revealed a small number of cracks on the sample with the largest mean pore size of 22.32 ${mu}m$. In addition, increasing the pore size led to a smaller decrease in both pressure drop and elastic modulus. In conclusion, controlling the pore size can enhance thermal shock behavior. |
| Key words:
Porous nozzle, Pore size, Thermal shock behavior, Mechanical properties, Microstructure |
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