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5456 |
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Friday, June 09, 2017, Hall 27 11:00 AM Suspension Spraying III |
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Suspension plasma sprayed YAG coatings: Formation and development of the phase composition after heat treatment. |
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Jan Medricky* / Institute of Plasma Physics CAS, Czech Republic Radek Musalek / Institute of Plasma Physics CAS, Czech republic Frantisek Lukac/ Institute of Plasma Physics CAS, Czech republic Jiri Kotlan/ Institute of Plasma Physics CAS, Czech republic Tomas Tesar/ Institute of Plasma Physics CAS, Czech republic Tomas Chraska/ Institute of Plasma Physics CAS, Czech republic |
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Plasma sprayed coatings of yttrium aluminum garnet (YAG) has shown perspective properties for high-temperature thermal barrier coatings; such as high temperature stability and low oxygen impermeability. In the recent studies, standard deposition process from coarse powders is substituted by plasma spraying from suspensions, which brings along some new desired properties, like finely-distributed porosity. In this study, yttrium aluminum garnet coatings were prepared from suspensions using hybrid water stabilized plasma (WSP-H) torch and two approaches of YAG formation were tested. First was plasma spraying of YAG from commercially available suspension and second approach was spraying of a mixture of Y2O3 and Al2O3 suspensions, forming eutectic Al2O3/Y3Al5O12 structure in the coating. All the prepared coatings shown presence of amorphous phase in the as-sprayed deposit. The evolution of phase composition, hardness and microstructure were investigated after the additional heat treatment of the coatings. |