Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders
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 t...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Ural Federal University
2021-05-01
|
| Series: | Chimica Techno Acta |
| Subjects: | |
| Online Access: | https://chimicatechnoacta.ru/article/view/5072 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850227545812762624 |
|---|---|
| author | E. G. Kalinina D. S. Rusakova E. Yu. Pikalova |
| author_facet | E. G. Kalinina D. S. Rusakova E. Yu. Pikalova |
| author_sort | E. G. Kalinina |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-f549847c905343d7b192594efbe9be74 |
| institution | OA Journals |
| issn | 2411-1414 |
| language | English |
| publishDate | 2021-05-01 |
| publisher | Ural Federal University |
| record_format | Article |
| series | Chimica Techno Acta |
| spelling | doaj-art-f549847c905343d7b192594efbe9be742025-08-20T02:04:48ZengUral Federal UniversityChimica Techno Acta2411-14142021-05-018210.15826/chimtech.2021.8.2.063921Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowdersE. G. Kalinina0D. S. Rusakova1E. Yu. Pikalova2Institute of Electrophysics, Ural Brunch of Russian Academy of Sciences, Yekaterinburg; Ural Federal University, YekaterinburgUral Federal University, YekaterinburgUral Federal University, Yekaterinburg; Institute of High Temperature Electrochemistry, Ural Brunch of Russian Academy of Sciences, YekaterinburgThe 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.https://chimicatechnoacta.ru/article/view/5072aluminum oxidenanopowderstable suspensionzeta potentialelectrophoretic depositionbulk compacts |
| spellingShingle | E. G. Kalinina D. S. Rusakova E. Yu. Pikalova Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders Chimica Techno Acta aluminum oxide nanopowder stable suspension zeta potential electrophoretic deposition bulk compacts |
| title | Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders |
| title_full | Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders |
| title_fullStr | Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders |
| title_full_unstemmed | Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders |
| title_short | Electrophoretic deposition of coatings and bulk compacts using magnesium-doped aluminum oxide nanopowders |
| title_sort | electrophoretic deposition of coatings and bulk compacts using magnesium doped aluminum oxide nanopowders |
| topic | aluminum oxide nanopowder stable suspension zeta potential electrophoretic deposition bulk compacts |
| url | https://chimicatechnoacta.ru/article/view/5072 |
| work_keys_str_mv | AT egkalinina electrophoreticdepositionofcoatingsandbulkcompactsusingmagnesiumdopedaluminumoxidenanopowders AT dsrusakova electrophoreticdepositionofcoatingsandbulkcompactsusingmagnesiumdopedaluminumoxidenanopowders AT eyupikalova electrophoreticdepositionofcoatingsandbulkcompactsusingmagnesiumdopedaluminumoxidenanopowders |