Preparation of YSZ/Al2O3 composite coatings via electrophoretic deposition of nanopowders
Using electrophoretic deposition (EPD), we have produced YSZ individual ceramic coatings and YSZ/Al 2 O 3 composite coatings for a wide range of applications in modern materials research. YSZ and Al 2 O 3 nanopowders were prepared by high-energy physical dispersion techniques, namely, by a laser eva...
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Veröffentlicht in: | Inorganic materials 2016-12, Vol.52 (12), p.1301-1306 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Using electrophoretic deposition (EPD), we have produced YSZ individual ceramic coatings and YSZ/Al
2
O
3
composite coatings for a wide range of applications in modern materials research. YSZ and Al
2
O
3
nanopowders were prepared by high-energy physical dispersion techniques, namely, by a laser evaporation–condensation process and electroexplosion of wire, respectively. Stable nonaqueous suspensions for the EPD process have been prepared using YSZ and Al
2
O
3
nanopowders with an average particle size of 11 and 22 nm, respectively. The YSZ/Al
2
O
3
composite coating produced by sintering at 1200°C has been shown to have higher density in comparison with the YSZ individual coating produced at the same temperature. X-ray diffraction characterization showed that the YSZ/Al
2
O
3
composite coating consisted of two crystalline phases: α-Al
2
O
3
(corundum) (42 wt %) and cubic ZrO
2
〈Y
2
O
3
〉 (58 wt %). Quantitative analysis of electron micrographs of the surface of the films showed that the YSZ individual coating produced by sintering at 1200°C had a loose structure and contained pores (9%), as distinct from the composite coating, which had a dense, porefree grain structure. |
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ISSN: | 0020-1685 1608-3172 |
DOI: | 10.1134/S0020168516110054 |