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This work investigated the behaviour of introducing ZrSi2 layer between the top coat layer Yttria-stabilized zirconia (YSZ)and the bond coat layer CoNiCrAlY in thermal barrier coatings where ZrSi2 layer helped self-healing of the cracks. Powdermixtures of ZrSi2/8YSZ and ZrSi2 /CoNiCrAlY were used to imitate the real case. At 800 °C under argon, there was no changein the chemical composition of both ZrSi2 and 8YSZ. ZrSi2 was oxidized in case of treatment in air atmosphere at 800 °C withno evidence for any self-healing reactions. At 1000 and 1200 °C under argon the formation of ZrSiO4 phase was detected whichwas a strong evidence of self-healing reaction. ZrSiO4 phase was also detected at 1200 °C in air with the appearance of SiO2phase. A limited interaction was detected at 1000 °C between ZrSi2 and CoNiCrAlY under vacuum. Si was detected in thesurface of CoNiCrAlY grains and Ni was detected in the composition of ZrSi2. This behavior could contribute to a chemicalbonding between ZrSi2 and CoNiCrAlY layers. The obtained data were confirmed by XRD, SEM and EDX analyses.

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