Enhanced thermal shock resistance of corundum-spinel castables by dip-coating of platelet-like lanthanum hexa-aluminate on corundum aggregates

The interface between the aggregates and matrix in corundum-spinel castables plays a crucial role in the thermal shock resistance. The lanthanum hexa-aluminate (LHA) interfacial layer between aggregates and matrix were prepared by dip-coating and heat-treatment. The microstructural evolution of the...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2025-01, p.117216, Article 117216
Main Authors: Feng, Yuan, Ding, Donghai, Xiao, Guoqing, Jin, Endong, Hou, Xing, Jia, Xuan
Format: Article
Language:English
Subjects:
Aggregates/matrix interface
Corundum-spinel castables
Lanthanum hexa-aluminate
Nanoindentation
Thermal shock resistance
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Summary:The interface between the aggregates and matrix in corundum-spinel castables plays a crucial role in the thermal shock resistance. The lanthanum hexa-aluminate (LHA) interfacial layer between aggregates and matrix were prepared by dip-coating and heat-treatment. The microstructural evolution of the LHA interfacial layer and its effect on the thermal shock resistance of castables were investigated. The results indicated that the highest amount of platelet-like LHA crystals was formed after heat-treatment at 1600 ℃. The thermal shock resistance of the castables was significantly enhanced by the LHA interfacial layer, with the optimal residual strength ratio at 1600 ℃. The residual strength ratio after 3 thermal shock cycles were improved by 166%. The specific fracture energy of the aggregate/matrix interface obtained by nanoindentation was increased by the LHA interfacial layers which promoted the crack deflection and branching in the interface and inhibit the cracks cross through the aggregates.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2025.117216