Thermal Treatment Influence on Microstructure of Plasma Sprayed Zirconia Thin Films
Keywords:
films, microstructure, plasma spraying, ZrO2, thermal treatment.Abstract
The objective of the present study is to investigate the effect of heat treatment on plasma sprayed thin YSZ films deposited on the stainless steal sheets employing non-equilibrium plasma spraying technology at atmospheric pressure. Synthesized thin (20 – 30) μm samples of 10 vol% yttria stabilized zirconia (10-YSZ) for SOFC electrolyte application were thermally treated at temperature 800 °C for 1, 5 and 10 hours respectively.
Two different processing regimes with different processing temperature and their effect on coating microstructure and crystallinity has been investigated. Phase analysis of the plasma sprayed films by X-ray diffractometry (XRD) showed that the nano-scale particles were remained in the films after annealing. The analysis of the as-sprayed YSZ films showed the small increase of grain size during annealing.
Microstructure of polished cross-section of the as-sprayed and heat treated films has been investigated by scanning electron microscopy (SEM).
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