Abstract

ZAVALETA, Jhonattan  and  BONDAREVA, Olga. The Influence of the initial size of the Yttrium Oxide stabilized tetragonal phase Zirconium Oxide powder on the formation of a thermal protection barrier. Tecnia [online]. 2020, vol.30, n.2, pp.69-73. ISSN 0375-7765.  http://dx.doi.org/10.21754/tecnia.v30i2.616.

In this work we study the effects on the porosity and microhardness properties when using different tetragonal phase zirconium oxide stabilized with yttrium oxide as diameters powders (less than 40 μm, between 40 to 60 μm and greater than 80 μm) to deposit in the upper layer of a TBC system (thermal barrier coating) of double layer formed by NiCoCrAlY and tetragonal phase zirconium oxide stabilized with yttrium oxide using the plasma spray process, in order to find the suitable powder and feasible to use as top layer. To this end, instruments such as TESCAN Vega SB scanning electron microscope with INCA Energy dispersive microanalyzer were used, with which it was possible to detect the porosity in different areas of evaluation of the upper layer and the Vickers durometer to measure the microhardness. Verifying that with particle diameters smaller than 40 μm, the aforementioned properties are adequate for the conformation of the tetragonal phase zirconium oxide stabilized with yttrium oxide such as top layer.

Keywords : porosity; microhardness; thermal protection barriers; plasma spraying process; NiCoCrAlY and zirconium oxide in tetragonal phase stabilized with yttrium oxide.

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