Microestructura y propiedades mecánicas por microindentación y nanoindentación de un recubrimiento de circona estabilizada con itria (4,5% en mol) elaborado por plasma atmosférico a partir de suspensiones

Abstract

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.