Characterization of Powder-Precursor HVOF-Sprayed Al<subscript>2</subscript>O<subscript>3</subscript>-YSZ/ZrO<subscript>2</subscript> Coatings.
In: Journal of Thermal Spray Technology, Jg. 28 (2019), Heft 1/2, S. 98-107
Online
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Zugriff:
Thermal spraying using liquid feedstock can produce coatings with very fine microstructures either by utilizing submicron particles in the form of a suspension or through in situ synthesis leading, for example, to improved tribological properties. The focus of this work was to obtain a bimodal microstructure by using simultaneous hybrid powder-precursor HVOF spraying, where nanoscale features from liquid feedstock could be combined with the robustness and efficiency of spraying with powder feedstock. The nanostructure was achieved from YSZ and ZrO 2 solution-precursors, and a conventional Al 2 O 3 spray powder was responsible for the structural features in the micron scale. The microstructures of the coatings revealed some clusters of unmelted nanosized YSZ/ZrO 2 embedded in a lamellar matrix of Al 2 O 3 . The phase compositions consisted of γ- and α-Al 2 O 3 and cubic, tetragonal and monoclinic ZrO 2 . Additionally, some alloying of the constituents was found. The mechanical strength of the coatings was not optimal due to the excessive amount of the nanostructured YSZ/ZrO 2 addition. An amount of 10 vol.% or 7 wt.% 8YSZ was estimated to result in a more desired mixing of constituents that would lead to an optimized coating architecture. [ABSTRACT FROM AUTHOR]
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Titel: |
Characterization of Powder-Precursor HVOF-Sprayed Al<subscript>2</subscript>O<subscript>3</subscript>-YSZ/ZrO<subscript>2</subscript> Coatings.
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Autor/in / Beteiligte Person: | Kiilakoski, Jarkko ; Puranen, Jouni ; Heinonen, Esa ; Koivuluoto, Heli ; Vuoristo, Petri |
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Zeitschrift: | Journal of Thermal Spray Technology, Jg. 28 (2019), Heft 1/2, S. 98-107 |
Veröffentlichung: | 2019 |
Medientyp: | academicJournal |
ISSN: | 1059-9630 (print) |
DOI: | 10.1007/s11666-018-0816-x |
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