YSZ PROTECTIVE COATINGS ELABORATED BY MOCVD ON NICKEL-BASED ALLOYS

The aim of this work is to study both the mechanical and the structura l properties of yttria-stabilized zirconia (YS2) coatings prepared on metallic substrates. YSZ films were obtained in a hot wall MOCVD react or using Zr(thd)(4) and Y(thd)(3) as organometallic precursors. The ev aporation and the deposition temperatures were chosen in order to stab ilize the cubic phase of the zirconia. The coatings were produced on d ifferent nickel and chromium alloys substrates. X-ray diffraction and SIMS techniques were used to characterize the influence of different e xperimental parameters, such as substrate nature, deposition temperatu re and thermal treatment, on the structure and composition of the YSZ film and the film,substrate interface. Mechanical properties of the co atings were also determined, before and after heat treatment, by means of microindentation tests. (C) 1998 Elsevier Science S.A.