Influence of MgO addition on the properties of new tailored FGZM/A ceramics

A new functionally graded zirconia-mullite/alumina ceramic (FGZM/A), a refractory composite, and its constituent separated single zirconia-mullite/alumina (ZM/A) layers were designed and synthesised by the reaction sintering of zircon and alumina. The effect of MgO addition, different sintering temp...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-01, Vol.578, p.197-206
Main Authors: EWAIS, Emad M. M, BESISA, Dina H. A, ZAKI, Zaki I
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Ceramics
Compressive strength
Condensed matter: structure, mechanical and thermal properties
Densification
Exact sciences and technology
Hardness
Magnesium oxide
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Physics
Sintering (powder metallurgy)
Thermal expansion
Thermal expansion
thermomechanical effects and density
Thermal properties of condensed matter
Thermal properties of crystalline solids
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Summary:A new functionally graded zirconia-mullite/alumina ceramic (FGZM/A), a refractory composite, and its constituent separated single zirconia-mullite/alumina (ZM/A) layers were designed and synthesised by the reaction sintering of zircon and alumina. The effect of MgO addition, different sintering temperatures and sintering times on the mineral composition, densification parameters, microstructure, mechanical and thermal properties of FGZM/A and its separated ZM/A layers were investigated. Results showed that the tailored FGZM/A ceramics had a continuous homogeneous structure without a sharp interface. MgO addition enhanced the densification parameters in terms of apparent porosity and bulk density, microstructure and compressive strength of the ZM/A system but had little effect on the hardness, fracture toughness, thermal expansion and thermal shock resistance. FGZM/A in the presence of MgO showed a gradient in its properties from one layer to the other. Average values for all the separated composites made from single layers through the different properties reflected the strong interfacial bonding and homogenous distribution of powders in their different layers.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.04.053