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Y3Al5O12-α-Al2O3 composites with fine-grained microstructure by hot pressing of Al2O3-Y2O3 glass microspheres

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Abstract
Yttrium aluminate glass microspheres with the eutectic composition 76.8 mol. % Al2O3 and 23.2 mol. % Y2O3 were prepared by combining the sol-gel Pechini method with flame synthesis. The sol-gel method was applied to achieve the desired composition homogeneity of the prepared glass and hence, improve the microstructure homogeneity and mechanical properties of bulk polycrystalline materials. The latter were prepared by hot pressing, more specifically pressure assisted sintering, at 1050 degrees C, 1300 degrees C and 1600 degrees C using pressures of 30 MPa and 80 MPa and holding times between 0 and 30 min. This also led to the crystallization of the glass. A composite with the Vickers hardness 18.0 +/- 0.7 GPa and an indentation fracture toughness 4.9 +/- 0.3 MPa.m(1/2) was obtained by sintering at 1600 degrees C, at the pressure of 80 MPa and with 30 min isothermal heating at the maximum temperature. Improved mechanical properties were observed when increasing the temperature of sintering and the holding time. This can be attributed to the formation of a unique microstructure consisting of alpha-Al2O3 grains in the mu m-scale embedded in a YAG (yttrium-aluminium garnet) matrix in the hot-pressed samples.
Keywords
Yttrium-Aluminate glass, Eutectic structure, Hot-Press sintering, Vickers hardness, Fracture toughness, YTTRIUM-ALUMINUM-GARNET, MECHANICAL-PROPERTIES, STABILIZED ZIRCONIA, EUTECTIC CERAMICS, CRYSTALLIZATION, TEMPERATURE, BEHAVIOR, SURFACE

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MLA
Prnová, Anna, et al. “Y3Al5O12-α-Al2O3 Composites with Fine-Grained Microstructure by Hot Pressing of Al2O3-Y2O3 Glass Microspheres.” JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 40, no. 3, 2020, pp. 852–60.
APA
Prnová, A., Valúchová, J., Parchovianský, M., Wisniewski, W., Švančárek, P., Klement, R., … Galusek, D. (2020). Y3Al5O12-α-Al2O3 composites with fine-grained microstructure by hot pressing of Al2O3-Y2O3 glass microspheres. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 40(3), 852–860.
Chicago author-date
Prnová, Anna, Jana Valúchová, Milan Parchovianský, Wolfgang Wisniewski, Peter Švančárek, Robert Klement, Ľubomír Hric, Els Bruneel, and Dušan Galusek. 2020. “Y3Al5O12-α-Al2O3 Composites with Fine-Grained Microstructure by Hot Pressing of Al2O3-Y2O3 Glass Microspheres.” JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 40 (3): 852–60.
Chicago author-date (all authors)
Prnová, Anna, Jana Valúchová, Milan Parchovianský, Wolfgang Wisniewski, Peter Švančárek, Robert Klement, Ľubomír Hric, Els Bruneel, and Dušan Galusek. 2020. “Y3Al5O12-α-Al2O3 Composites with Fine-Grained Microstructure by Hot Pressing of Al2O3-Y2O3 Glass Microspheres.” JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 40 (3): 852–860.
Vancouver
1.
Prnová A, Valúchová J, Parchovianský M, Wisniewski W, Švančárek P, Klement R, et al. Y3Al5O12-α-Al2O3 composites with fine-grained microstructure by hot pressing of Al2O3-Y2O3 glass microspheres. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. 2020;40(3):852–60.
IEEE
[1]
A. Prnová et al., “Y3Al5O12-α-Al2O3 composites with fine-grained microstructure by hot pressing of Al2O3-Y2O3 glass microspheres,” JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 40, no. 3, pp. 852–860, 2020.
@article{8634262,
  abstract     = {Yttrium aluminate glass microspheres with the eutectic composition 76.8 mol. % Al2O3 and 23.2 mol. % Y2O3 were prepared by combining the sol-gel Pechini method with flame synthesis. The sol-gel method was applied to achieve the desired composition homogeneity of the prepared glass and hence, improve the microstructure homogeneity and mechanical properties of bulk polycrystalline materials. The latter were prepared by hot pressing, more specifically pressure assisted sintering, at 1050 degrees C, 1300 degrees C and 1600 degrees C using pressures of 30 MPa and 80 MPa and holding times between 0 and 30 min. This also led to the crystallization of the glass. A composite with the Vickers hardness 18.0 +/- 0.7 GPa and an indentation fracture toughness 4.9 +/- 0.3 MPa.m(1/2) was obtained by sintering at 1600 degrees C, at the pressure of 80 MPa and with 30 min isothermal heating at the maximum temperature. Improved mechanical properties were observed when increasing the temperature of sintering and the holding time. This can be attributed to the formation of a unique microstructure consisting of alpha-Al2O3 grains in the mu m-scale embedded in a YAG (yttrium-aluminium garnet) matrix in the hot-pressed samples.},
  author       = {Prnová, Anna and Valúchová, Jana and Parchovianský, Milan and Wisniewski, Wolfgang and Švančárek, Peter and Klement, Robert and Hric, Ľubomír and Bruneel, Els and Galusek, Dušan},
  issn         = {0955-2219},
  journal      = {JOURNAL OF THE EUROPEAN CERAMIC SOCIETY},
  keywords     = {Yttrium-Aluminate glass,Eutectic structure,Hot-Press sintering,Vickers hardness,Fracture toughness,YTTRIUM-ALUMINUM-GARNET,MECHANICAL-PROPERTIES,STABILIZED ZIRCONIA,EUTECTIC CERAMICS,CRYSTALLIZATION,TEMPERATURE,BEHAVIOR,SURFACE},
  language     = {eng},
  number       = {3},
  pages        = {852--860},
  title        = {Y3Al5O12-α-Al2O3 composites with fine-grained microstructure by hot pressing of Al2O3-Y2O3 glass microspheres},
  url          = {http://dx.doi.org/10.1016/j.jeurceramsoc.2019.10.017},
  volume       = {40},
  year         = {2020},
}

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