Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 18, Pages 24768-24776Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.08.218
Keywords
MA; MgO-MA refractory aggregates; MgO-C slide plate; TSR
Categories
Funding
- National Natural Science Foundation of China [51672253, 51872266]
- Open Research Project of Ministry of State Key Laboratory of Metallurgical Refractories, Wuhan University of Science and Technology [G201601]
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This work provides an effective method for synthesis of MgO-MgAl2O4 (MgO-MA) aggregates with good thermal shock resistance (TSR) using lightly calcined magnesia and alpha-Al2O3 micro-powder as the starting materials. The effect of alpha-Al2O3 micro-powder amount and calcination temperature on TSR and microstructure of the syn thesized MgO-MA aggregates was investigated. The optimum amount of alpha-Al2O3 micro-powder was 15 wt%, and the obtained aggregates had the highest density after calcination at 1650 degrees C. The synthesized MgO-MA aggregates had excellent TSR which was attributed to the thermal mismatch of MgO and MA grains as well as the pinning effect of MA grains on the periclase grain boundaries. TSR of MgO-C slide plate materials was improved significantly by introducing appropriate amount of the synthesized MgO-MA aggregates.
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