Publication detail

Pressure assisted sintering of Al2O3-Y2O3 glass microspheres: sintering conditions, grain size, and mechanical properties of sintered ceramics

PRNOVÁ, A. VALÚCHOVÁ, J. MICHÁLKOVÁ, M. PECUŠOVÁ, B. PARCHOVIANSKÝ, M. ŠVANCÁREK, P. HANZEL, O. POUCHLÝ, V. GALUSEK, D.

Original Title

Pressure assisted sintering of Al2O3-Y2O3 glass microspheres: sintering conditions, grain size, and mechanical properties of sintered ceramics

Type

journal article in Web of Science

Language

English

Original Abstract

Glass microspheres with yttria-alumina eutectic composition (76.8 mol % Al2O3 and 23.2 mol % Y2O3) were prepared by sol-gel Pechini method and flame synthesis with or without subsequent milling. Prepared amorphous powders were studied by X-ray powder diffraction (XRD), particle size analysis (PSA), scanning electron microscopy (SEM) and differential thermal analysis (DTA). Hot pressing (HP), rapid hot pressing (RHP) and spark plasma sintering (SPS) were used to sinter amorphous precursor powders at 1600 degrees C without holding time (0 min). The preparation process including milling step resulted in amorphous powders with narrower particle size distribution and smaller particle size. All applied pressure assisted sintering techniques resulted in dense bulk samples with fine grained microstructure consisting of irregular alpha-Al2O3 and Y3Al5O12 (YAG) grains. Milling was beneficial in terms of final microstructure refinement and mechanical properties of sintered materials. A material with the Vickers hardness of HV = (17.1 +/- 0.3) GPa and indentation fracture resistance of (4.2 +/- 0.2) MPa.m(1/2) was prepared from the powder milled for 12 h.

Keywords

Flame synthesis; HP; RHP; solid state chemistry; SPS; SSC 2021; yttrium-aluminate glasses

Authors

PRNOVÁ, A.; VALÚCHOVÁ, J.; MICHÁLKOVÁ, M.; PECUŠOVÁ, B.; PARCHOVIANSKÝ, M.; ŠVANCÁREK, P.; HANZEL, O.; POUCHLÝ, V.; GALUSEK, D.

Released

23. 2. 2022

Publisher

WALTER DE GRUYTER GMBH

Location

BERLIN

ISBN

1365-3075

Periodical

PURE AND APPLIED CHEMISTRY

Year of study

94

Number

2

State

United Kingdom of Great Britain and Northern Ireland

Pages from

157

Pages to

167

Pages count

11

URL

https://www.degruyter.com/document/doi/10.1515/pac-2021-0705/html

BibTex

@article{BUT177143,
  author="Anna {Prnová} and Jana {Valúchová} and Monika {Michálková} and Beáta {Pecušová} and Milan {Parchovianský} and Peter {Švancárek} and Ondrej {Hanzel} and Václav {Pouchlý} and Dušan {Galusek}",
  title="Pressure assisted sintering of Al2O3-Y2O3 glass microspheres: sintering conditions, grain size, and mechanical properties of sintered ceramics",
  journal="PURE AND APPLIED CHEMISTRY",
  year="2022",
  volume="94",
  number="2",
  pages="157--167",
  doi="10.1515/pac-2021-0705",
  issn="1365-3075",
  url="https://www.degruyter.com/document/doi/10.1515/pac-2021-0705/html"
}