Investigation of the Influence of Hydrofluoric Acid and Temperature on the Sintering Processes and Phase Formation in Alumina Nanofiber-based Ceramics

Authors

  • Alex S. Demianov Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia | Siberian Federal University, Krasnoyarsk, Russia
  • Sergey S. Dobrosmyslov Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia | Siberian Federal University, Krasnoyarsk, Russia
  • Gennady E. Nagibin Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia | Siberian Federal University, Krasnoyarsk, Russia
  • Anton S. Voronin Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia | Siberian Federal University, Krasnoyarsk, Russia
  • Mihail M. Simunin Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia | Siberian Federal University, Krasnoyarsk, Russia
  • Airana A. Kyylar Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia
  • Maksim S. Molokeev Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center (KSC SB RAS), Krasnoyarsk, Russia | Department of Physics, Far Eastern State Transport University, Khabarovsk, Russia
  • Elena N. Fedorova Siberian Federal University, Krasnoyarsk, Russia
  • Marina A. Perkova Siberian Federal University, Krasnoyarsk, Russia
  • Ivan V. Nemtsev Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia| Kirensky Institute of Physics, Federal Research Center (KSC SB RAS), Krasnoyarsk, Russia | Siberian Federal University, Krasnoyarsk, Russia
  • Stanislav V. Khartov Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences", Russian Academy of Sciences (FRC KSC SB RAS), Krasnoyarsk, Russia
Volume: 15 | Issue: 3 | Pages: 22792-22801 | June 2025 | https://doi.org/10.48084/etasr.9547

Received: 11 November 2024 | Revised: 5 December 2024 | Accepted: 8 December 2024 | Online: 4 June 2025


Corresponding author: Sergey S. Dobrosmyslov

Abstract

This work studies a ceramic material, synthesized from alumina nanofiber via semi-dry pressing with an average diameter of 10 nm and a high aspect ratio (>1000), with Hydrofluoric Acid (HF) used as a mineralizer. The effects of varying firing temperature and HF concentration were systematically investigated. The material was characterized using electron microscopy, X-ray fluorescence analysis, and X-ray phase analysis, while thermodynamic calculations of phase transformations were conducted. Additionally, strength, density, and open porosity were analyzed as functions of the processing parameters. The analysis revealed that an optimal HF concentration of 1% and a firing temperature of 800 °C yield the best physical and mechanical properties. Furthermore, the transition mechanism from the γ-phase to the α-phase under varying HF concentrations and firing temperatures was examined. A linear dependence of the concentration of Fluorine (F) atoms in the ceramic material on the firing temperature was established. The maximum physical and mechanical characteristics include a compressive strength of 49 MPa with a porosity of 46% and a density of 1.47 g/cm³.

Keywords:

ceramics, nanofiber, aluminum oxide, hydrofluoric acid, microstructure, compressive strength

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[1]
Demianov, A.S., Dobrosmyslov, S.S., Nagibin, G.E., Voronin, A.S., Simunin, M.M., Kyylar, A.A., Molokeev, M.S., Fedorova, E.N., Perkova, M.A., Nemtsev, I.V. and Khartov, S.V. 2025. Investigation of the Influence of Hydrofluoric Acid and Temperature on the Sintering Processes and Phase Formation in Alumina Nanofiber-based Ceramics. Engineering, Technology & Applied Science Research. 15, 3 (Jun. 2025), 22792–22801. DOI:https://doi.org/10.48084/etasr.9547.

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Copyright (c) 2025 Alex S. Demianov, Sergey S. Dobrosmyslov, Gennady E. Nagibin, Anton S. Voronin, Mihail M. Simunin, Airana A. Kyylar, Maksim S. Molokeev, Elena N. Fedorova, Marina A. Perkova, Ivan V. Nemtsev, Stanislav V. Khartov

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