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Ingeniare. Revista chilena de ingeniería

On-line version ISSN 0718-3305

Abstract

GONZALEZ H., Andrés G.; HURTADO, Francy M.  and  LOPEZ, Esperanza. Microstructure and mechanical properties measured by microindentation and nanoindentation of 4.5 YSZ coating elaborated by suspension plasma spraying. Ingeniare. Rev. chil. ing. [online]. 2017, vol.25, n.2, pp.314-325. ISSN 0718-3305.  http://dx.doi.org/10.4067/S0718-33052017000200314.

In this paper the microstructure of 4.5 mol% Yttria-Stabilized-Zirconia (4.5YSZ) coating and its mechanical properties measured by nanoindentation and microhardness was analyzed. The coatings were elaborated by suspension plasma spraying (SPS) from a suspension of ethanol and two types of powders (3 and 8 mol% YSZ) with nanosized particles. The analysis of the microstructure of the cross section of the 4.5 wt. YSZ coating revealed a bimodal structure, which was composed of a zone with semi-molten particles (ZS) and another zone consisting of lamellae with a high degree of fusion (ZF). Nanoindentation tests showed a bimodal Weibull distribution for hardness and monomodal Weibull distribution for elastic modulus (E), which is related to its structure. Microhardness tests (hardness Vickers and E) had a monomodal Weibull distribution. These results of microindentation were influenced by the contact area of the indentation zones, as they took the two zones (ZF and ZS) of the microstructure of 4.5YSZ coating revealing global measurement of their mechanical properties.

Keywords : Suspension plasma spraying; coating; YSZ; nanoindentation; microindentation.

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