Mechanical behavior characterization of high zirconia fused-cast refractories at high temperature: Influence of the cooling stage on microstructural changes

Patapy, Cédric; Gey, Nathalie; Hazotte, Alain; Humbert, Michel; Chateigner, D.; Guinebretière, René; Huger, Marc; Chotard, Thierry

doi:10.1016/j.jeurceramsoc.2012.04.043

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…The purpose of this paper is to determine the level of local strains in such pure zirconia polycrystals. Recent studies on fused cast zirconia have introduced very interesting samples made of sub-millimetric pure zirconia areas embedded into a glassy phase [22,23]. Such microstructure is the result of a phase separation process occurring in the liquid state in the pseudo binary phase SiO 2 -ZrO 2 phase diagram [24,25].…”

Section: Methodsmentioning

confidence: 99%

Huge local elastic strains in bulk nanostructured pure zirconia materials

Örs

Gouraud

Michel

et al. 2021

Materials Science and Engineering: A

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From the liquid state to room temperature, two successive solid-state phase transitions occur in pure zirconia. It is well-known that the last one (tetragonal to monoclinic) is martensitic and induces large volume variations and shear strains. Elastic and inelastic behaviors of zirconia-based materials are strongly influenced by this transition and the associated strain fields that it induces. Knowledge of strain and stress at the crystal scale is thus a crucial point. Using fully dense pure zirconia polycrystals obtained by a fuse casting process, we have determined at a sub-micrometric scale, by X-ray Laue microdiffraction, the strains map at room temperature in as-cast specimens and after a post elaboration high temperature thermal treatment. We observed that the fluctuation of deviatoric elastic strain is huge, the standard deviation of normal component being in the range of 1-2%. The heat treatment tends to even further increase this range of fluctuation, despite the development of a multiscale crack network formed during the cooling. Correspondingly, the associated stress level is also huge. It lies in the 5 GPa range with stress gradient amounting 1 GPa μm − 1 .

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Section: Methodsmentioning

confidence: 99%

Huge local elastic strains in bulk nanostructured pure zirconia materials

Örs

Gouraud

Michel

et al. 2021

Materials Science and Engineering: A

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“…This transformation is associated with a large volume expansion of about 5% [2]. This generates large local (micro) stresses and typically microcracks [3]. While the polymorphism in zirconium ceramics is very well known [4,5], most of the literature is limited to the case of structural ceramics utilized in a rather low temperature range.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Thermal Microcracking in Refractory ZrO2-SiO2 after Application of External Loads at High Temperatures

et al. 2019

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Zirconia-based cast refractories are widely used for glass furnace applications. Since they have to withstand harsh chemical as well as thermo-mechanical environments, internal stresses and microcracking are often present in such materials under operating conditions (sometimes in excess of 1700 °C). We studied the evolution of thermal (CTE) and mechanical (Young’s modulus) properties as a function of temperature in a fused-cast refractory containing 94 wt.% of monoclinic ZrO2 and 6 wt.% of a silicate glassy phase. With the aid of X-ray refraction techniques (yielding the internal specific surface in materials), we also monitored the evolution of microcracking as a function of thermal cycles (crossing the martensitic phase transformation around 1000 °C) under externally applied stress. We found that external compressive stress leads to a strong decrease of the internal surface per unit volume, but a tensile load has a similar (though not so strong) effect. In agreement with existing literature on -eucryptite microcracked ceramics, we could explain these phenomena by microcrack closure in the load direction in the compression case, and by microcrack propagation (rather than microcrack nucleation) under tensile conditions.

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“…A dense, low porosity microstructure ensures good thermal properties [9] while limiting chemical ingress of corrosive agents [10,11,12]. Strength [13,14] corrosion resistance and microstructural properties are affected by cooling rates during manufacture [15] and subsequent melting in service. Failure of these checkers can result in shut-down of the furnace with significant loss of production for the manufacture.…”

Section: Introductionmentioning

confidence: 99%

The mechanism of corrosion of Aluminium Zirconium Silicate (AZS) material in the float glass furnace regenerator

George

Haycock

Ormerod

2018

Journal of the European Ceramic Society

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Failure mechanisms in AZS materials from the regenerators of two float glass furnaces are presented. Results of a post-mortem examination of materials are used to identify the physical and chemical changes during service. Methods used include bulk density and apparent porosity measurements, optical microscopy, scanning electron microscopy (SEM), elemental dispersive analysis (EDA), x-ray fluorescence spectroscopy (XRF), x-ray diffraction (XRD) and IR spectroscopy. Corrosion was found to be related to oxidising and reducing conditions and temperature. Chemical and physical differences between virgin and three different furnace materials are identified and used to propose a mechanism for corrosion in different zones of the glass furnace regenerator.

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Mechanical behavior characterization of high zirconia fused-cast refractories at high temperature: Influence of the cooling stage on microstructural changes

Cited by 10 publications

References 18 publications

Huge local elastic strains in bulk nanostructured pure zirconia materials

Huge local elastic strains in bulk nanostructured pure zirconia materials

Evolution of Thermal Microcracking in Refractory ZrO2-SiO2 after Application of External Loads at High Temperatures

The mechanism of corrosion of Aluminium Zirconium Silicate (AZS) material in the float glass furnace regenerator

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