Investigation of the Effects of CMAS-infiltration in EB-PVD 7% Yttria-Stabilized Zirconia via Raman Spectroscopy

Bohorquez, Estefania; Sarley, Brooke; Hernandez, Johnathan; Hoover, Ryan; Tetard, Laurene; Naraparaju, Ravisankar; Schulz, Uwe; Raghavan, Seetha

doi:10.2514/6.2018-0096

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…1(b). High-energy XRD is able to characterize the state of the TBCs, including preferred orientation (texture), phase fraction, and lattice strain of the coating, which has been done in previous studies [14,15,16,17]. Often, a raw diffraction pattern is integrated to produce intensity versus d-spacing plot as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

et al. 2020

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Section: Introductionmentioning

confidence: 99%

High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

et al. 2020

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Erosion resistance of CMAS infiltrated sacrificial suspension sprayed alumina top layer on EB-PVD 7YSZ coatings

Steinberg

Mikulla

Naraparaju

et al. 2019

Wear

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High-temperature infiltration behavior and phase stability of yttria-stabilized zirconia (7YSZ) thermal barrier coatings (TBC) produced by atmospheric plasma spray interacting with volcanic ashes (VAs) are presented here. Three VAs from the Colima, Popocatepetl, and Eyjafjallajökull volcanoes have been used in this work. Previous to infiltration experiments, physicochemical characterization of the VAs was carried out including thermal analyses by DSC, structural studies by XRD, and ICP chemical composition measurements. TBCs' infiltration tests were carried out at 1250 °C for different times. Results showed that infiltration depth as a function of time behaves in a non-linear way. Mainly two important infiltration behaviors were identified corresponding to high-and slow-speed infiltration regimes. Higher infiltration kinetics was detected for VAs with lower SiO 2 content. The extent of chemical degradation of the 7YSZ is directly related to the silica content. For greater SiO 2 values, a higher content of monoclinic ZrO 2 was observed leading to maximum values at intermediate annealing times between 2 and 5 h. This behavior can be correlated with the high-speed tetragonal to monoclinic ZrO 2 transformation at short times (between 2 and 5 h) until a maximum monoclinic content is reached. After that, the reaction follows by the interplay of ZrSiO 4 formation at the expense of previously formed m-ZrO 2 together with the incorporation of Y and Zr to the glass melt.

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Synchrotron X-Ray Diffraction Study of Phase Transformation in CMAS Ingressed EB-PVD Thermal Barrier Coatings

Stein

Naraparaju

Schulz

et al. 2020

AIAA Scitech 2020 Forum

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Investigation of the Effects of CMAS-infiltration in EB-PVD 7% Yttria-Stabilized Zirconia via Raman Spectroscopy

Cited by 4 publications

References 8 publications

High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

Erosion resistance of CMAS infiltrated sacrificial suspension sprayed alumina top layer on EB-PVD 7YSZ coatings

Synchrotron X-Ray Diffraction Study of Phase Transformation in CMAS Ingressed EB-PVD Thermal Barrier Coatings

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