Microstructure and indentation mechanical properties of YSZ nanostructured coatings obtained by suspension plasma spraying

SURFACE & COATINGS TECHNOLOGY

卷:220

Article; Proceedings Paper

Carpio, P.¹  Rayon, E.²  Pawlowski, L.³  Cattini, A.^3,4  Benavente, R.²  Bannier, E.¹  Salvador, M. D.²  Sanchez, E.¹ 

[1] Univ Jaume 1, Inst Tecnol Ceram ITC, Castellon de La Plana, Spain

[2] Univ Politecn Valencia, Inst Tecnol Mat ITM, E-46071 Valencia, Spain

[3] Univ Limoges, CNRS, Sci Proc Ceram & Traitements Surface SPCTS, UMR 7315, Limoges, France

[4] Univ Modena & Reggio Emilia, Dipartimento Ingn Mat & Ambiente, Modena, Italy

关键词: Suspension plasma spraying;    Yttria stabilised zirconia;    Thermal barrier coating;    Indentation;   

DOI  :  10.1016/j.surfcoat.2012.09.047

来源: Elsevier

【 摘 要 】

A commercial nanosuspension of yttria-stabilised zirconia (YSZ) was successfully deposited on austenitic stainless steel substrate by suspension plasma spraying technique (SPS). A SG-100 torch with internal radial injection was used for the spraying. The pneumatic system transported the feed suspension from the containers to the plasma torch. In order to study the effect of the spraying parameters, a factorial model was used to design the experiments, changing both spraying translation speed and suspension flow rate. The coating microstructure was characterised by FEG-SEM. All coatings displayed a two-zone microstructure formed by nanometre-sized particles surrounded by fully molten areas. Moreover, crystalline phases were determined by XRD and Raman spectroscopy. Mechanical properties were also determined using nanoindentation technique. Nanoindentation tests showed a bimodal distribution of the mechanical properties (hardness and Young's modulus) which is related to the two zones (molten and partially molten) present in the coatings. (C) 2012 Elsevier B.V. All rights reserved.

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