Thermomechanical behaviour of mullite-zirconia composite

Hamidouche, M.; Bouaouadja, Noureddine; Osmani, Hocine; Torrecillias, R.; Fantozzi, Gilbert

doi:10.1016/0955-2219(95)00110-7

Cited by 39 publications

(20 citation statements)

References 7 publications

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“…Generally, the largest toughness increases seen in mullite are by addition of various zirconia‐based additives with multiple toughness values around 5 MPa m 1/2 . The presence of additives such as yttria gives an advantage in terms of processing, although zirconia itself lowers the temperature needed to sinter mullite without pressure . Both composites with addition of stabilized and unstabilized zirconia have given increased toughness at ambient temperatures.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature fracture toughness of mullite with monoclinic zirconia

et al. 2017

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Reactive sintering of zircon and alumina and zirconia additions to mullite are well-established methods for improving the poor fracture toughness of mullite.While it is clear that transformation toughening is responsible for the improved toughness by addition of partially stabilized zirconia, it is not clear why adding unstabilized zirconia increases the toughness although microcracking and crack deflection have been suggested. Therefore, the fracture toughness of a mullite composite with 20 vol% unstabilized zirconia and a monolithic mullite were investigated at ambient conditions and at temperatures up to 1225°C. It was found that monoclinic zirconia increases the toughness at ambient conditions from the monolithic mullite value of 1.9 to 3.9 MPaÁm 1/2 . The toughness of the composite with zirconia remains relatively constant from ambient to 600°C but then decreases rapidly. The mechanism for the toughness enhancement as well as the reason for its variation with temperature are explained using changes in residual stress state as deduced using the sphere in shell model from the measured thermal expansion behavior.

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Section: Introductionmentioning

confidence: 99%

High‐temperature fracture toughness of mullite with monoclinic zirconia

et al. 2017

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“…2c. The higher thermodynamic affinity between alumina and silica, compared to zirconia and silica (highlighted, for example, by the dissociation occurring when zircon is mixed with alumina), 61 helped by the high reactivity of the silicone/nano-alumina mixtures, previously discussed, promotes the formation of a mullite matrix embedding nano-sized zirconia particles, mostly stabilized in the tetragonal form. The retention of the tetragonal form is due to mechanical constraint generated by the very fine mullite grains (diameter <200 nm), on zirconia crystals (diameter <100 nm).…”

Section: Phase Puritymentioning

confidence: 92%

Multifunctional advanced ceramics from preceramic polymers and nano-sized active fillers

Colombo

Bernardo

Parcianello

2013

Journal of the European Ceramic Society

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“…For the T1500 material the microstructure is a well-defined mullite (dark gray) ceramic matrix with a homogeneous distribution of imbibed zirconia and zirconium titanate grains (light gray, the second slightly darker), this microstructure is comparable to the typical dispersoidal mullite zirconia composites [7][8][9][10][11][12][13][14][15][16][17][18][19] but with the addition ZrTiO 4 phase. This interlocked microstructure with the imbibed zirconia grains has been fully described and several toughening mechanisms have been proposed to be possible to occur in this kind of materials [58,[60][61][62].…”

Section: Microstructure (Sem)mentioning

confidence: 94%

“…Particularly mullite-zirconia composites are materials with important technological applications due to their good properties such as toughness, chemical stability, and high-creep resistance [7][8][9][10][11][12]. In practice they are employed in the glass industry and where high chemical and corrosion resistance are required.…”

Section: Introductionmentioning

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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Thermomechanical behaviour of mullite-zirconia composite

Cited by 39 publications

References 7 publications

High‐temperature fracture toughness of mullite with monoclinic zirconia

High‐temperature fracture toughness of mullite with monoclinic zirconia

Multifunctional advanced ceramics from preceramic polymers and nano-sized active fillers

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

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