Publication detail

Thermal cycling effect on the phase stability and fracture resistance of synthetic barium/magnesium aluminosilicate systems

CASAS LUNA, M. RAVASZOVÁ, S. SKALKA, P. GEJDOŠ, P. JECH, D. SLÁMEČKA, K. KAISER, J. DVOŘÁK, K. ČELKO, L.

Original Title

Thermal cycling effect on the phase stability and fracture resistance of synthetic barium/magnesium aluminosilicate systems

Type

journal article in Web of Science

Language

English

Original Abstract

This paper focuses on the high-temperature solid-state synthesis of barium-magnesium-aluminosilicate (BMAS) system and its thermal cycling stability between the room temperature and 1200 degrees C. The BMAS powder was synthesized by adding 0.8 mol of MgO for 1 mol of BaAl2Si2O8 (BAS system) to get a stabilized monoclinic phase (celsian-BMAS). The undoped BAS system with a metastable hexagonal phase (hexacelsian-BAS) was also produced for comparison. Both celsian-BMAS and hexacelsian-BAS powders were sintered by spark plasma sintering (SPS) technique at 1300 degrees C and 50 MPa. In-situ X-ray diffraction and thermogravimetric analyses together with hardness and indentation fracture resistance measurements proved the thermal stability of the celsian-BMAS system. In contrast, the hexacelsian-BAS compound suffered typical phase transformations during the thermal cycling test, causing its failure in less than 25 cycles. The presence of magnesium in the BMAS system led to the formation of secondary phases, such as Ba/Mg-rich micas and/or barium silicides, which did not affect the thermal integrity of the stable celsian phase. The celsian-BMAS system exhibited a linear thermal expansion in all unit cell directions, giving better thermal reliability to this material over the hexacelsian-BAS system. Besides, this work emphasizes the phase transformations in the studied systems that have been ignored in previous research, and it also compares several common equations for calculation of the indentation fracture resistance.

Keywords

Barium-magnesium-aluminosilicate; Solid-state reaction; Thermal-phase stability; Thermal cycling behavior; Indentation fracture resistance

Authors

CASAS LUNA, M.; RAVASZOVÁ, S.; SKALKA, P.; GEJDOŠ, P.; JECH, D.; SLÁMEČKA, K.; KAISER, J.; DVOŘÁK, K.; ČELKO, L.

Released

19. 6. 2020

Publisher

ELSEVIER SCI LTD

Location

OXFORD

ISBN

0272-8842

Periodical

Ceramics International

Year of study

46

Number

15

State

United Kingdom of Great Britain and Northern Ireland

Pages from

24129

Pages to

24136

Pages count

8

URL

https://doi.org/10.1016/j.ceramint.2020.06.192

BibTex

@article{BUT165226,
  author="Mariano {Casas Luna} and Simona {Ravaszová} and Petr {Skalka} and Pavel {Gejdoš} and David {Jech} and Karel {Slámečka} and Jozef {Kaiser} and Karel {Dvořák} and Ladislav {Čelko}",
  title="Thermal cycling effect on the phase stability and fracture resistance of synthetic barium/magnesium aluminosilicate systems",
  journal="Ceramics International",
  year="2020",
  volume="46",
  number="15",
  pages="24129--24136",
  doi="10.1016/j.ceramint.2020.06.192",
  issn="0272-8842",
  url="https://doi.org/10.1016/j.ceramint.2020.06.192"
}