Detail publikace

Tailoring microstructure and properties of porous mullite-based ceramics via sol-gel impregnation

BARTONÍČKOVÁ, E. ŠVEC, J. DLABAJOVÁ, L. HRUBÝ, P. CÁBA, V. SEDLAČÍK, M. KALINA, L. KOPLÍK, J. ŠOUKAL, F. KERŠNEROVÁ, L. ZACH, J. DVOŘÁK, K. NOVÁK, V.

Originální název

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Nanotechnology has been introduced into the refractory industry decades ago. However, there are still some peculiarities that hinder its routine application. Poor mechanical strength is one of them. Here we present the fabrication technique for mullite porous ceramics using a calcium-free colloidal binder system followed by secondary sol-gel impregnation intended for fabrication of large up-scaled monoliths. The primary foam was prepared via direct foaming of slurry containing colloidal silica, gelling agents, surfactant, silica fume, and different types of alumina. The foam mixture was cast, de-molded and dried using a cascade drying procedure. The investigation of mullitization that occurred during the high-temperature treatment was studied by XRD and TG-DTA analysis. The optimized sintering curve was then applied to obtain the highest mechanical properties. The resulting foam (with open porosity, volume density about 900 kg/m3 and mechanical strength about 10 MPa) was further processed by the impregnation step. The applied silica or combined silica/aluminum sol and unreacted alumina underwent secondary mullitization during following high-temperature treatment, which significantly enhanced the mechanical strength (up to 18 MPa). The secondary mullitization process was also investigated by HT-XRD and TG-DTA analysis. Foam microstructure was observed by an electron scanning microscope. Thermal conductivity of as-prepared ceramics foams varied from 0.3 to 0.4 W/m & sdot;K. The foam wall porosity evolution was studied by mercury intrusion porosimeter and estimated from image analysis.

Klíčová slova

Sol-gel processes (A); Porosity (B); Mechanical properties (C); Mullite (D)

Autoři

BARTONÍČKOVÁ, E.; ŠVEC, J.; DLABAJOVÁ, L.; HRUBÝ, P.; CÁBA, V.; SEDLAČÍK, M.; KALINA, L.; KOPLÍK, J.; ŠOUKAL, F.; KERŠNEROVÁ, L.; ZACH, J.; DVOŘÁK, K.; NOVÁK, V.

Vydáno

3. 2. 2025

Nakladatel

ELSEVIER SCI LTD

Místo

London

ISSN

0272-8842

Periodikum

Ceramics International

Ročník

Číslo

Stát

Spojené království Velké Británie a Severního Irska

Strany od

5505

Strany do

5513

Strany počet

URL

https://www.webofscience.com/wos/woscc/full-record/WOS:001423840800001

BibTex

@article{BUT197611,
  author="Eva {Bartoníčková} and Jiří {Švec} and Lucie {Dlabajová} and Petr {Hrubý} and Vladislav {Cába} and Martin {Sedlačík} and Lukáš {Kalina} and Jan {Koplík} and František {Šoukal} and Lucie {Keršnerová} and Jiří {Zach} and Karel {Dvořák} and Vítězslav {Novák}",
  title="Tailoring microstructure and properties of porous mullite-based ceramics via sol-gel impregnation",
  journal="Ceramics International",
  year="2025",
  volume="51",
  number="5",
  pages="5505--5513",
  doi="10.1016/j.ceramint.2024.06.019",
  issn="0272-8842",
  url="https://www.webofscience.com/wos/woscc/full-record/WOS:001423840800001"
}