Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 20, Pages 30451-30461Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.06.325
Keywords
Nano-Al2O3; MgAl2O4; MgO/nano MgAl2O4 core-shell aggregates; MgO-C slide Plate material; TSR
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Funding
- National Natural Science Foundation of China [51872266, 52172031]
- Henan Provincial Science and Technology Research Project [222102230030]
- Central China Thousand Talents Project [204200510011]
- Open Research Project of State Key Laboratory of Advanced Refractories [SKLAR202006]
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MgO/nano MgAl2O4 core-shell aggregates with excellent hydration resistance and thermal shock resistance were prepared. The in-situ formed MgAl2O4 reduces the contacting area between MgO and water, and also reduces the pore size, resulting in improved resistance. The pinning effect of nano-MgAl2O4 and thermal mismatch between MgO and MgAl2O4 contribute to enhancing thermal shock resistance.
MgO/nano MgAl2O4 core-shell aggregates were prepared using nano-Al2O3 suspension and MgO aggregates by vacuum impregnation method and then heat treated. The MgO/nano MgAl2O4 core-shell aggregates possess excellent hydration resistance and thermal shock resistance (TSR), which are attributed to the in-situ formed MgAl2O4 reducing the contacting area between MgO and water as well as the reduced pore and pore size. The pinning effect of nano-MgAl2O4 and thermal mismatch between MgO and MgAl2O4 contribute to improving TSR of aggregates. The TSR and hot modulus of ruputure were enhanced when the prepared MgO/nano MgAl2O4 core-shell aggregates were introduced into MgO-C slide plate.
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