Studying the self-healing reaction based on zirconium silicide in the Thermal Barrier Coating system
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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.
Abstract
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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