Please use this identifier to cite or link to this item: http://elar.urfu.ru/handle/10995/100705
Title: Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders
Authors: Kalinina, E. G.
Rusakova, D. S.
Pikalova, E. Yu.
Issue Date: 2021-07
Publisher: Ural Federal University
Уральский федеральный университет
Citation: Kalinina E. G. Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders / E. G. Kalinina, D. S. Rusakova, E. Yu. Pikalova // Chimica Techno Acta. — 2021. — Vol. 8, No. 2. — № 20218206.
Abstract: The electrophoretic deposition (EPD) of coatings and bulk compacts in a wide range of thicknesses (from 23 to 1800 μm) from stable suspensions of a magnesium-doped aluminum oxide nanopowder with subsequent sintering of samples into dense ceramics was studied. The initial nanopowder was obtained by the method of electric explosion of an Al-Mg alloy wire with a Mg content of 1.3 wt. %. The study of the dispersion composition, kinetics of deaggregation under the ultrasonic treatment and zeta potential in the nanopowder-based suspensions was carried out. It was shown that a nearly linear increase in the deposited mass and thickness of EPD deposits occurred at a constant voltage of 20 V and an average deposition current of approximately 40 μA when the deposition time was varied from 1 to 180 min. Drying of the coatings with a thickness of less than 35 μm led to the formation of a net of small cracks, while drying of the bulk compacts with a thickness of more than 1 mm occurred without cracking. The ceramic bulk sample with a thickness of 1.2 mm and the density of 98.7% TD was successfully obtained by sintering at 1650 °C for 4 h. It was characterized by a dense grain structure with an average grain size of 5 μm and the presence of a small number of closed pores less than 1 μm in size. Sintering of ceramics was revealed to be accompanied by the formation of a MgAl2O4 crystalline spinel phase, localized mainly at grain boundaries.
Keywords: ALUMINUM OXIDE
NANOPOWDER
STABLE SUSPENSION
ZETA POTENTIAL
ELECTROPHORETIC DEPOSITION
URI: http://elar.urfu.ru/handle/10995/100705
RSCI ID: https://www.elibrary.ru/item.asp?id=46407568
ISSN: 2411-1414
DOI: 10.15826/chimtech.2021.8.2.06
Sponsorship: The work was partially carried out using the equipment of the shared access centers of the Institute of Electrophysics (IEP UB RAS) and Institute of High Temperature Electrochemistry (IHTE UB RAS), Composition of compounds.
Origin: Chimica Techno Acta. 2021. Vol. 8. № 2
Appears in Collections:Chimica Techno Acta

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