Mechanical properties of double-layer and graded composite coatings of YSZ obtained by atmospheric plasma spraying
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Other documents of the author: Carpio Cobo, Pablo; Rayón, E.; Salvador Moya, María Dolores; Lusvarghi, Luca; Sánchez-Vilches, Enrique
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7033
comunitat-uji-handle3:10234/8618
comunitat-uji-handle4:
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Title
Mechanical properties of double-layer and graded composite coatings of YSZ obtained by atmospheric plasma sprayingAuthor (s)
Date
2016Publisher
Springer VerlagISSN
1059-9630; 1544-1016Type
info:eu-repo/semantics/articlePublisher version
http://link.springer.com/article/10.1007/s11666-016-0390-zVersion
info:eu-repo/semantics/acceptedVersionSubject
Abstract
Double-layer and graded composite coatings of yttria-stabilized zirconia were sprayed on metallic substrates by atmospheric plasma spray. The coating architecture was built up by combining two different feedstocks: ... [+]
Double-layer and graded composite coatings of yttria-stabilized zirconia were sprayed on metallic substrates by atmospheric plasma spray. The coating architecture was built up by combining two different feedstocks: one micro- and one nanostructured. Microstructural features and mechanical properties (hardness and elastic modulus) of the coatings were determined by FE-SEM microscopy and nanoindentation technique, respectively. Additional adherence and scratch tests were carried out in order to assess the failure mechanisms occurring between the layers comprising the composites. Microstructural inspection of the coatings confirms the two-zone microstructure. This bimodal microstructure which is exclusive of the layer obtained from the nanostructured feedstock negatively affects the mechanical properties of the whole composite. Nanoindentation tests suitably reproduce the evolution of mechanical properties through coatings thickness on the basis of the position and/or amount of nanostructured feedstock used in the depositing layer. Adhesion and scratch tests show the negative effect on the coating adhesion of layer obtained from the nanostructured feedstock when this layer is deposited on the bond coat. Thus, the poor integrity of this layer results in lower normal stresses required to delaminate the coating in the adhesion test as well as minor critical load registered by using the scratch test. [-]
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Journal of Thermal Spray Technology, April 2016, Volume 25, Issue 4, pp 778-787Rights
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