Microstructure and phase evolution of alumina–spinel self-flowing refractory castables containing nano-alumina particles

The microstructure and phase composition of alumina–spinel self-flowing refractory castables added with nano-alumina particles at different temperatures are investigated. The physical and mechanical properties of these refractory castables are studied. The results show that the addition of nano-alum...

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Bibliographic Details
Published in:Ceramics international 2011-04, Vol.37 (3), p.1003-1009
Main Authors: Otroj, Sasan, Daghighi, Arash
Format: Article
Language:English
Subjects:
Aluminous refractories
Aluminum oxide
B. Microstructure
C. Mechanical properties
Castable refractories
D. Al2O3
D. Spinel
E. Refractories
Mechanical properties
Microstructure
Nanocomposites
Nanomaterials
Nanostructure
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Summary:The microstructure and phase composition of alumina–spinel self-flowing refractory castables added with nano-alumina particles at different temperatures are investigated. The physical and mechanical properties of these refractory castables are studied. The results show that the addition of nano-alumina has a great effect on the physical and mechanical properties of these refractory castables. With the increase of nano-alumina content in the castable composition, the mechanical strength is considerably increased at various temperatures. It is shown that nano-alumina particles can affect formed phases after firing. The platy crystals of CA6 are detected inside the grain boundaries of tabular alumina and spinel grains in samples fired at 1500°C. CA6 phase can be formed at lower temperatures (1300°C) with the addition of nano-alumina particles. As a result of using nanometer-sized alumina particles with high surface area, the solid phase sintering of the nano-sized particles and CA6 formation can occur at lower temperatures.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2010.11.013