Mullite–zirconia–zircon composites: Properties and thermal shock resistance

Rendtorff, Nicolás M.; Garrido, Liliana B.; Aglietti, E.F.

doi:10.1016/j.ceramint.2008.02.015

Cited by 64 publications

(44 citation statements)

References 20 publications

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“…In this case, fine-sized powders and a sintering aid as zircon are needed. It has been reported that mullite-zirconiazircon composites result in the improvement of the thermal shock resistance of the material [3].…”

Section: Introductionmentioning

confidence: 99%

Phase quantification of mullite–zirconia and zircon commercial powders using PAC and XRD techniques

et al. 2010

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The short range technique of the Perturbed Angular Correlation (PAC) and x-ray diffraction (Rietveld) methods have been employed to determine the phase content in commercial mullite-zirconia and zircon raw materials that are ordinarily used to produce ceramic materials. The PAC technique, which probes zirconiumcontaining compounds at nanoscopic level, showed that zircon contains crystalline ZrSiO 4 and an important amount of a structurally distorted zircon, which is also observed accompanying monoclinic zirconia in mullite-zirconia. This particular zircon phase was not detected by the long range x-ray diffraction-Rietveld technique. After an annealing treatment, important changes in crystalline contents of the powders allow confirming, by the x-ray diffraction-Rietveld method, the preexistence of this particular zircon phase. This fact must be taken into account when preparing multicomposites based on the present raw materials.

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Section: Introductionmentioning

confidence: 99%

Phase quantification of mullite–zirconia and zircon commercial powders using PAC and XRD techniques

et al. 2010

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“…Mullite-zirconia-zircon multicomposites were prepared following reference [14] and using the commercial raw materials characterized by PAC in reference [4]. Mixtures of electrofused mullite-zirconia, named MZ, (MUZR, Elfusa LT, Brazil) powder milled to D 50 = 5 μm and 15, 25, 35 and 45 wt.% of zircon powder, named z, (Mahlwerke Kreuts, Mikron, Germany, D 50 = 2 μm) were consolidated by slip casting and dried at 110 • C. The resulting compacts, hereinafter labeled MZz15, MZz25, MZz35 and MZz45, were fired at 1,600 • C for 2 h at heating and cooling rates of 10 • C/min.…”

Section: Compositesmentioning

confidence: 99%

“…The content and structure of phases present in these materials may be related to the phase content of the raw materials and to the eventual zircon dissociation and monoclinic to tetragonal martensitic zirconia transformation [20]. It has been suggested [14] that during MZz sintering total or partial zircon decomposition into zirconia and silica occurs depending on zircon concentration. Nevertheless, by using XRD and SEM micrography, no evidence of the resulting silica was found.…”

Section: Introductionmentioning

confidence: 99%

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A short and long range study of mullite–zirconia–zircon composites

et al. 2010

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In the field of refractory materials, ceramics containing mullite-zirconia are the basis of those most used in the industry of glass and steel. It is known that the addition of zircon improves the behavior of the refractory used in service. Knowing that some mullite-zirconia composites properties as fracture strength and the elastic modulus E are associated with the material microstructure integrity, the eventual thermal decomposition of zircon into zirconia and silica could seriously alter the material elastic properties. In this paper the phase content of a series of mullite-zirconia-zircon (3Al 2 O 3 .2SiO 2 -ZrO 2 -ZrSiO 4 ) composites is determined at atomic level via perturbed angular correlations (PAC) and compared with that derived from the long range X-ray diffraction technique. PAC results on the asprepared materials indicate that all nominal zircon is present and that it involves two types of nanoconfigurations, one of them describing aperiodic regions. The

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“…6A that the unreacted alumina, zircon and titania powders were partially sintered due to the thermal treatment. No important chemical reaction occurred besides de Anatase-Rutile conversion [57]. The grain size is equivalent to the starting powder size (from data sheet).…”

Section: Microstructure (Sem)mentioning

confidence: 99%

Dense mullite–zirconia–zirconium titanate ceramic composites by reaction sintering

Rendtorff

Gómez

Gauna

et al. 2016

Ceramics International

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Materials from the Al 2 O 3 -SiO 2 -ZrO 2 and the Al 2 O 3 -SiO 2 -ZrO 2 -TiO 2 systems have several high temperature applications because they present the good refractoriness, chemical inertness, adequate mechanical and thermo-mechanical behaviors with a relatively good cost: performance ratio. In this work stoichiometric (3:2:1) molar incompatible mixtures of alumina (Al 2 O 3 ), zircon (ZrSiO 4 ) and titania (TiO 2 ) were slip casted and sintered in a 1300-1500 1C temperature range in order to obtain mullite (3Al 2 O 3 Á 2SiO 2 ), zirconia (ZrO 2 ) and zirconium titanate (ZrTiO 4 ) dense triple ceramic composite.Both sintering and reaction occurred after the thermal treatments. Reaction progress and densification evolutions were established. Dense Triplex composite materials were achieved after 1500 1C treatments. The reaction-sintering was followed by XRD, TG-DTA, and dilatometry. Densification started at 1100 1C and the chemical reactions only started above 1300 1C. Aluminum titanate (Al 2 TiO 5 ) was found to be an intermediate of the reaction after 1400 1C treatments. Materials treated below 1300 1C presented a partial densification of the unreacted starting powders. Resulting ceramic materials were characterized. The crystalline phases were evaluated, as well as the texture properties. The achieved microstructure consisted in interlocked multiphase ceramic with zirconia (monoclinic) grains. The achieved Hv and K IC reached 9 GPa and 4.3 MPa m 1/2 respectively. The dense and interlocked ceramic microstructure and relative high mechanical properties of the developed material encourages several high temperature applications. Finally it can be pointed out that after 1500 1C treatments some detrimental grain growth was observed.

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Mullite–zirconia–zircon composites: Properties and thermal shock resistance

Cited by 64 publications

References 20 publications

Phase quantification of mullite–zirconia and zircon commercial powders using PAC and XRD techniques

Phase quantification of mullite–zirconia and zircon commercial powders using PAC and XRD techniques

A short and long range study of mullite–zirconia–zircon composites

Dense mullite–zirconia–zirconium titanate ceramic composites by reaction sintering

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