Mechanical properties of thermal barrier coatings after isothermal oxidation.

Rico, A.; Gómez-García, J.; Múnez, C.J.; Poza, P.; Utrilla, M. V.

doi:10.1016/j.surfcoat.2009.02.035

Cited by 61 publications

(29 citation statements)

References 31 publications

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“…However, previous works, where the porosity was measured by mercury porosimetry, revealed that porosity was reduced at high soak times but the mean void size was increased [20]. Other authors noted that a cracking during isothermal treatment is formed due to the TGO thickening that promotes out of plane stresses at the TGO and ceramic layer interfaces [21]. Nevertheless, this cracking was not observed in the present case because TGO thickening was slow and, hence, the cracking effect was counteracted by the sintering effect.…”

Section: Isothermal Treatmentmentioning

confidence: 95%

Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Carpio

Salvador

Borrell

et al. 2017

Ceramics International

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Zirconates with pyrochlore structure, such as Gd2Zr2O7, are new promising thermal barrier coatings because of their very low thermal conductivity and good chemical resistance against molten salts. However, their coefficient of thermal expansion is low, therefore their thermal fatigue resistance is compromised. As a solution, the combination of yttria-stabilised zirconia (YSZ) and Gd2Zr2O7 can reduce the thermal contraction mismatch between the thermal barrier coating parts.In the present study, two possible designs have been performed to combine YSZ/ Gd2Zr2O7. On the one hand, a multilayer coating was obtained where YSZ layer was deposited between a Gd2Zr2O7 layer and a bond coat. On the other hand, a functionallygraded coating was designed where different layers with variable ratios of YSZ/Gd2Zr2O7 were deposited such that the composition gradually changed along the coating thickness.Multilayer and functionally-graded coatings underwent isothermal and thermally-cycled treatments in order to evaluate the oxidation, sintering effects and thermal fatigue resistance of the coatings. The YSZ/Gd2Zr2O7 multilayer coating displayed better thermal behaviour than the Gd2Zr2O7 monolayer coating but quite less thermal fatigue resistance compared to the conventional YSZ coating. However, the functionally-graded coating displays a good thermal fatigue resistance. Hence, it can be concluded that this kind of design is ideal to optimise the behaviour of thermal barrier coatings.

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Section: Isothermal Treatmentmentioning

confidence: 95%

Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Carpio

Salvador

Borrell

et al. 2017

Ceramics International

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“…In particular, the top ceramic coatings have been applied to reduce the surface temperature of turbine blades, control on-demand air-cooling, and thus extend TBC service life, and improve aero-engine efficiency. However, TBCs are susceptible to various life limiting issues associated with their operating environment conditions including erosion [9][10][11], corrosion [12,13], oxidation [14,15], sintering [3,16,17], and foreign object damage (FOD) [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on deformation and mechanical properties of 8 mol% yttria-stabilized zirconia by Berkovich nanoindentation

Mao

Luo

Dai

et al. 2015

Applied Surface Science

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“…These data are required to estimate residual stress and to predict damage and failure (Ref 16). The lack of such data has limited the modeling of the behavior of the coating substrate systems ( Ref 17,18). Measurement of the elastic modulus of a coating is a difficult task due to the thinness of the coating which makes measurements highly sensitive to experimental errors; hence, there are currently only limited published data on the high temperature YoungÕs moduli of coatings of the types considered here ( Ref 16,19).…”

Section: Introductionmentioning

confidence: 99%