期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 12, 页码 4276-4282出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.05.002
关键词
Lightweight periclase-magnesium alumina spinel castable; Thermal conductivity; Strength; Thermal shock resistance; Slag resistance
资金
- Youth Dawn Plan of Science and Technology in Wuhan City of China [2016070204010108]
- Key Project of Natural Science Foundation of Hubei Province of China [2015CFA122]
- National Natural Science Foundation of China [51302201]
This study presents a new lightweight periclase-magnesium alumina spinel castable (LPSC) for the working lining of steel ladles using porous periclase-spinel aggregates to replace conventional dense magnesia aggregates. The porous periclase-spinel aggregates were produced by an in-situ decomposition technique resulting in an apparent porosity of 23.3% and a median pore size of 5.66 mu m. Scanning electron microscopy revealed a better porous aggregate/matrix interface bonding in the LPSC, which significantly improved its strength and thermal shock resistance. Additionally, the higher amount of micropores of the porous aggregates in the LPSC absorbed more penetrated slag from the matrix, which enhanced the slag resistance. Thus, compared with conventional castables, the LPSC had a lower bulk density of 9.2-10.8% and a lower thermal conductivity of 18.8% (1000 degrees C) while at the same time a higher strength, thermal shock resistance and slag resistance was achieved.
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