| Optimizing Nanostructured Yttria-Stabilized Zirconia
Electrophoretic Coatings on MCrAlY Bond-Coated Inconel
738LC Superalloy |
Amirreza Khezrloo,a, b Mohammadreza Afshar,a, b, * Saeid Baghshahic
and Ahmad Ali Amadehd
Pages : 21-30
DOI : 10.1080/0371750X.2022.2152369 |
| Abstract |
| In this research study, to apply uniform and homogenous nanostructured yttriastabilized zirconia (YSZ) coatings on the Inconel 738LC with MCrAlY bond-coat, the
effect of electrophoretic parameters was evaluated. Two different suspensions of 3YSZ
nanoparticles were prepared in acetylacetone and acetone separately, using an
iodine dispersant. The electrophoretic deposition was conducted by applying voltages
of 20 V, 50 V and 80 V for 3 min on MCrAlY coated Inconel 738LC. The coatings were
sintered for 120 min at 900o
, 1000o
and 1100oC temperature. The results revealed that
the non-uniform coating included some cracks and cavities as the applied voltage
exceeded the optimal amount. The results also depicted that the YSZ coating prepared
in acetylacetone medium with 0.4 g/L iodine dispersant, voltage of 50 V, coating time
of 3 min, and sintering temperature of 1000oC was a uniform and crack-free structure.
Furthermore, the results showed that a continuous alumina layer was formed during
oxidation.
[Keywords: Electrophoretic deposition, Thermal barrier coating, Nanostructure,
Yttria-stabilized zirconia, Inconel 738LC] |
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