TY - JOUR
T1 - Densification mechanism of porous alumina plugs by molten steel with different oxygen levels
AU - Chen, Liugang
AU - Malfliet, Annelies
AU - Zheng, Lichun
AU - Jones, Peter Tom
AU - Blanpain, Bart
AU - Guo, Muxing
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/6
Y1 - 2018/6
N2 - To investigate the densification of porous alumina plugs, hydrogen measurements, using the Hydris probe system, were performed in molten steel with different oxygen levels at around 1600 °C. The oxygen contents in molten steel were controlled by Al and Fe-Si alloy additions to 664, 296, 92, 51 and 2.5 ppm, respectively. High oxygen levels (> = 92 ppm) in molten steel were found to favor the infiltration of steel into porous alumina plug. The infiltrating steel interacts with SiO2-containing phases and Al2O3 inside the plug, forming liquid FeOn-Al2O3-SiO2 slag and FeAl2O4 (hercynite). These newly formed phases, along with the infiltrating steel fill the porous structure of the alumina plugs. As a result, severe densification was observed inside the alumina plugs in contact with molten steel containing high oxygen levels. In comparison, no densification occurred in the plugs contacting with the steel having low oxygen contents of 51 and 2.5 ppm.
AB - To investigate the densification of porous alumina plugs, hydrogen measurements, using the Hydris probe system, were performed in molten steel with different oxygen levels at around 1600 °C. The oxygen contents in molten steel were controlled by Al and Fe-Si alloy additions to 664, 296, 92, 51 and 2.5 ppm, respectively. High oxygen levels (> = 92 ppm) in molten steel were found to favor the infiltration of steel into porous alumina plug. The infiltrating steel interacts with SiO2-containing phases and Al2O3 inside the plug, forming liquid FeOn-Al2O3-SiO2 slag and FeAl2O4 (hercynite). These newly formed phases, along with the infiltrating steel fill the porous structure of the alumina plugs. As a result, severe densification was observed inside the alumina plugs in contact with molten steel containing high oxygen levels. In comparison, no densification occurred in the plugs contacting with the steel having low oxygen contents of 51 and 2.5 ppm.
KW - Densification
KW - Hydrogen probe measurements
KW - Porous alumina
KW - Refractory
KW - Steel
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U2 - 10.1016/j.jeurceramsoc.2018.01.031
DO - 10.1016/j.jeurceramsoc.2018.01.031
M3 - Article
AN - SCOPUS:85041112175
SN - 0955-2219
VL - 38
SP - 2662
EP - 2670
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 6
ER -