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Thermomechanical behavior of a zircon-mullite composite

AuthorsHamidouche, M.; Bouaouadja, N.; Torrecillas, Ramón CSIC ORCID CVN; Fantozzi, Gilbert
KeywordsComposite creep
Composite thermal shock resistance
Strain and rupture
Issue DateMay-2007
CitationCeramics International 33(4): 655-662 (2007)
AbstractA zircon–mullite composite was made by reaction sintering from a mixture of mullite and zircon powders. The thermomechanical characterization (strength and toughness) revealed an intermediate behavior between mullite and zircon. The composite presents a high cooling thermal shock resistance for temperatures between the ambient and 1000°C. Bending creep tests were made at temperatures between 1100 and 1300°C using stresses from 10 up to 90 MPa. The stress exponent value is between 2 and 3 while the activation energy varies from 280 up to 900 kJ mol−1 between 1000 and 1300°C. Microscopic observations suggest an intergranular creep mechanism. The grain interface forces between mullite and zircon are more important than those of zircon–zircon grains. The incorporation of mullite particles in a zircon matrix produces a composite that has both the good mullite behavior toward creep and the high thermal shock resistance of zircon.
Description8 pages, 14 figures.-- Available online Mar 3, 2006.
Publisher version (URL)http://dx.doi.org/10.1016/j.ceramint.2005.12.002
Appears in Collections:(INCAR) Artículos
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