Electrochemical synthesis of thin film YAG on inconel substrate

A novel method of electrochemical synthesis of yttrium aluminum garnet (YAG) thin-film coating on IN617 has been successfully developed in the mixture of Y(NO 3 ) 3 and Al(NO 3 ) 3 aqueous solution. The coating films were further annealed and characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The coating film was composed of hydrated Y(OH) 3 and Al(OH) 3 , the physically adsorbed water evaporated between 25 and 103°C, dehydrated into Y(OH) 3 and Al(OH) 3 between 103 and 400°C, condensed into YOOH and AlOOH between 400 and 890°C, and finally transformed into single-phase YAG (Y 3 Al 5 O 12 ) between 890 and 1000°C. The YAG coating film with a thickness about 2 μm revealed the uniform and adherent interface on the substrate.

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