Microstructural stability at elevated temperatures of directionally solidified Al2O3/Er3Al5O12 eutectic ceramics

Mesa, M.C.; Oliete, Patricia B.; Larrea, Á.

doi:10.1016/j.jcrysgro.2011.11.061

Cited by 22 publications

(8 citation statements)

References 12 publications

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“…In addition, table 1 presents the interspacing However, for AEZ samples grown at higher rates and, therefore, with finer microstructures, significant coarsening was observed. The coarsening was homogeneous throughout the sample cross-sections and there was no evidence of exaggerated localized coarsening, contrary to that observed in binary Al 2 O 3 -Er 3 Al 5 O 12 [16] and Al 2 O 3 -Y 3 Al 5 O 12 [18,26] eutectics.…”

Section: Microstructural Stability and Coarsening Kineticscontrasting

confidence: 70%

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

Mesa

Serrano-Zabaleta

Oliete

et al. 2014

Journal of the European Ceramic Society

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Al 2 O 3 -Er 3 Al 5 O 12 -ZrO 2 eutectic ceramic rods were directionally solidified using the laser floating zone method at different growth rates, 25, 350 and 1200 mm/h. The microstructure obtained, in terms of both morphology and phase size, was strongly dependent on the growth rate. However, electron backscatter diffraction experiments showed that the growth directions were the same for all the processing rates,[0001] Al2O3 //[100] EAG //[100] ZrO2 . The microstructural stability was investigated up to 1600ºC as a function of the growth rate. Ceramics with the largest phase size presented high stability, their microstructure remaining substantially unchanged at the highest annealing temperature for 100 hours. Eutectics processed at higher growth rates and with a finer microstructure showed coarsening after heat treatments. The sample grown at 350 mm/h coarsened at 1450ºC whereas the eutectic solidified at 1200 mm/h thickened at 1400ºC. The growth directions remain unaffected for all growth rates. The mechanisms of microstructural coarsening were investigated.2

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Section: Microstructural Stability and Coarsening Kineticscontrasting

confidence: 70%

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

Mesa

Serrano-Zabaleta

Oliete

et al. 2014

Journal of the European Ceramic Society

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“…7 Furthermore, it has been found that the above-mentioned excellent mechanical properties are closely related to their highly oriented, three-dimensionally interlocked microstructures of eutectic phases and absence of amorphous phases at interface by eliminating grain boundaries. ErAG) using laser-heated floating zone method, and found that the bending strength of Al 2 O 3 /ErAG reached a maximum value of 2.7 GPa, which could remain constant up to temperature about 1300 K. 10 Furthermore, they also found that microstructure of Al 2 O 3 /EuAlO 3 DSE becomes finer with the growth rate, and the interspacing follows the Hunt-Jackson law. 11 Similarly, Al 2 O 3 /GdAlO 3 DSE was prepared; and on increasing the solidification rate, the eutectic spacing is rapidly decreased, accompanied with the appearance of other types of microstructures such as colony structure and rod-like eutectic.…”

Section: Introductionmentioning

confidence: 98%

“…Mesa et al. prepared DSE Al 2 O 3 /Er 3 Al 5 O 12 (ErAG) using laser‐heated floating zone method, and found that the bending strength of Al 2 O 3 /ErAG reached a maximum value of 2.7 GPa, which could remain constant up to temperature about 1300 K 10 . Furthermore, they also found that microstructure of Al 2 O 3 /EuAlO 3 DSE becomes finer with the growth rate, and the interspacing follows the Hunt–Jackson law 11 .…”

Section: Introductionmentioning

confidence: 99%

Preparation, microstructures, and mechanical properties of directionally solidified Al₂O₃/Lu₃Al₅O₁₂ eutectic ceramics

Sun

Zhou

et al. 2021

Int J Applied Ceramic Tech

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Al2O3/Lu3Al5O12 (LuAG) directionally solidified eutectic (DSE) ceramics with two solidification rates were prepared utilizing optical floating zone (OFZ) technique. The microstructures (eutectic morphology, preferred growth direction and interface orientation) of Al2O3/LuAG were characterized, and the mechanical properties (Vickers hardness and fracture toughness) were compared with those of Al2O3/REAG (RE = Y, Er, and Yb). Results show that Al2O3/LuAG with solidification rate of 30 mm/h has established preferred growth direction in both Al2O3 and LuAG phases with cellular eutectic structures. While Al2O3/LuAG with solidification rate of 10 mm/h only shows preferred growth direction in Al2O3 phase and presents degenerate irregular eutectic microstructures. Besides, Al2O3/LuAG exhibits higher hardness compared with Al2O3/REAG (RE = Y, Er, and Yb). In addition, a special attention is focused on the relations among rare earth ionic radius, eutectic microstructures, and mechanical properties of these DSE ceramics. It is demonstrated that a smaller rare earth ionic radius could lead to larger eutectic interspacing as well as higher Vickers hardness of DSE Al2O3/REAG, revealing the possibility and feasibility of microstructure control and mechanical properties optimization for DSE Al2O3/REAG ceramics by tailoring the rare earth elements.

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“…In the recent decades, Al 2 O 3 -based eutectic ceramics have received much attention as structural materials, particularly because of excellent microstructural and chemical stability, creep resistance and mechanical strengths in high-temperature oxidizing atmosphere [1][2][3][4][5][6][7][8]. Very high values of flexural strength have been observed.…”

mentioning

confidence: 99%

“…The outcome will be applicable to similar alumina-garnet eutectics. Al 2 O 3 + 19 mol% Er 2 O 3 were prepared by mixing, compaction and sintering of the Al 2 O 3 (Aldrich 99.99%), Er 2 O 3 (Alfa Aesar 99.99%) powders, similarly as elsewhere [7]. Eutectic rods of diameters 1.2 to 1.6 mm were directionally solidified from the melt in nitrogen atmosphere [14] by the laser floating zone method at 25mm/h and 750mm/h processing The rods were cut to a length of 45 mm and both cross-sections were carefully polished for thermal shock tests.…”

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confidence: 99%

Influence of microstructural size on the thermal shock behavior of Al2O3-Er3Al5O12 directionally solidified eutectics

2019

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We analyze the thermal shock resistance of directionally solidified eutectics. When quenching in water, the resistance starts to deteriorate with temperature differences in the range 260 to 300 K, almost independent of the microstructure size (or initial flexural strength). Unlike other strong, dense ceramics, the loss of strength is gradual upon quenching in boiling water. The onset of crack propagation seems to be controlled by the mismatch of the thermal and elastic properties of the component phases, while the length of the propagated cracks is limited by their quantity, which is estimated to scale approximately with the interface density.

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Microstructural stability at elevated temperatures of directionally solidified Al2O3/Er3Al5O12 eutectic ceramics

Cited by 22 publications

References 12 publications

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

Preparation, microstructures, and mechanical properties of directionally solidified Al₂O₃/Lu₃Al₅O₁₂ eutectic ceramics

Influence of microstructural size on the thermal shock behavior of Al2O3-Er3Al5O12 directionally solidified eutectics

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Microstructural stability at elevated temperatures of directionally solidified Al2O3/Er3Al5O12 eutectic ceramics

Cited by 22 publications

References 12 publications

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

Preparation, microstructures, and mechanical properties of directionally solidified Al2O3/Lu3Al5O12 eutectic ceramics

Influence of microstructural size on the thermal shock behavior of Al2O3-Er3Al5O12 directionally solidified eutectics

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Preparation, microstructures, and mechanical properties of directionally solidified Al₂O₃/Lu₃Al₅O₁₂ eutectic ceramics