Electrochemical Synthesis of Thin Film YAG on Inconel Substrate

摘要

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 A1(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 A1(OH)3, the physically adsorbed water evaporated between 25 and 103 deg C, dehydrated into Y(OH)_3 and A1(OH)_3 between 103 and 400 deg C, condensed into YOOH and A1OOH between 400 and 890 deg C, and finally transformed into single-phase YAG (Y_3A1_5O_(12)) between 890 and 1000 deg C. The YAG coating film with a thickness about 2 mum revealed the uniform and adherent interface on the substrate.