APS prepared NiCrBSi-YSZ composite coatings for protection against cavitation erosion

Coating deposition of high wear resistant materials is an effective alternative for protection of commercial substrates against cavitation erosion. In present investigation, different amounts of NiCrBSi powders (5 wt%, 15 wt% et 25 wt%) were added into yttria stabilized zirconia (YSZ) powders in ord...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-03, Vol.699, p.1095-1103
Main Authors: Wang, Yan, Stella, Jorge, Darut, Geoffrey, Poirier, Thierry, Liao, Hanlin, Planche, Marie-Pierre
Format: Article
Language:English
Subjects:
Adhesive bonding
APS
Cavitation
Cavitation erosion
Cavitation resistance
Ceramic bonding
Ceramics
Coating effects
Composite
Erosion mechanisms
Erosion resistance
Microhardness
Microstructure
NiCrBSi
Particulate composites
Plasma spraying
Porosity
Protective coatings
Substrates
YSZ
Yttria-stabilized zirconia
Yttrium oxide
Zirconium dioxide
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Summary:Coating deposition of high wear resistant materials is an effective alternative for protection of commercial substrates against cavitation erosion. In present investigation, different amounts of NiCrBSi powders (5 wt%, 15 wt% et 25 wt%) were added into yttria stabilized zirconia (YSZ) powders in order to produce denser YSZ-NiCrBSi composite coatings employing atmospheric plasma spraying. The results indicate that an increase of the NiCrBSi amounts can promote a denser microstructure. As a consequence of the metallic particle addition cavitation resistance of the composite coating was improved, presumably due to the lower porosity produced in the coatings. On the other hand, although a significant change in microhardness was not measured as the amount of NiCrBSi particles was increased, weak metal-ceramic bondings on the interfaces related to NiCrBSi splats were observed. To some extent, low adhesion of NiCrBSi particles can counteract the positive effect of the low porosity resulting in a decreased resistance against cavitation erosion. •YSZ-NiCrBSi composite coatings were manufactured by APS for protection against cavitation.•As sprayed composite coatings exhibit a denser microstructure.•Cavitation damage is liable to happen at the edge of pores and splats interfaces.•Low adhesion of NiCrBSi-YSZ interfaces can counteract the positive effect of the low porosity.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.01.034