Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Steinberg, Lars; Naraparaju, Ravisankar; Heckert, Mirko; Mikulla, Christoph; Schulz, Uwe; Leyens, Christoph

doi:10.1016/j.jeurceramsoc.2018.06.039

Cited by 38 publications

(16 citation statements)

References 42 publications

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“…Besides the influence of the infiltration depth on the erosion behavior, the focus of this study is on the erosion behavior of the GZO reaction layer. The chemistry of CMAS as well as the infiltration time has shown a big influence on the erosion resistance of EB-PVD 7YSZ in previous studies by the authors (45,46). Therefore, two CMAS and one natural Iceland volcanic ash were used for short-term and longterm infiltration tests on EB-PVD GZO TBCs.…”

Section: Introductionmentioning

confidence: 78%

“…Erosion tests The erosion tests were carried out at room temperature in an erosion test rig at the Technische Universität Dresden. The erosion parameters were identical to those from (45,46). Al2O3 particles with a size distribution of 54.5 µm (d10), 92.5 µm (d50), and 142.7 µm (d90) (Cilas, Cilas 1064) were used at a feeding rate of 0.25 g/min (powder feeder GTV PF2/1, GTV Verschleißschutz GmbH).…”

Section: 2mentioning

confidence: 99%

“…However, both mechanisms occur alternately or even simultaneously during the life cycle of TBCs. So far, only a few studies (40,41,45,46) have considered the change in the erosion behavior of a TBC after CMAS infiltration. In one of our previous studies (46) the erosion behavior of a CMAS infiltrated TBC system (SPS Alumina layer: a sacrificial layer) was studied.…”

Section: Introductionmentioning

confidence: 99%

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Erosion behavior of CMAS/VA infiltrated EB-PVD Gd2Zr2O7 TBCs: Special emphasis on the effect of mechanical properties of the reaction products

Steinberg

Mikulla

Naraparaju

et al. 2022

Wear

Self Cite

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Section: Introductionmentioning

confidence: 78%

Section: 2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Erosion behavior of CMAS/VA infiltrated EB-PVD Gd2Zr2O7 TBCs: Special emphasis on the effect of mechanical properties of the reaction products

Steinberg

Mikulla

Naraparaju

et al. 2022

Wear

Self Cite

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“…This porous microstructure resulted in the reduction of the hardness as compared with the hardness of the dense bulk YAG which is 1700 HV because it reduces the effective cross sectional of the material and its load bearing capacity [33,49]. The hardness of the coating plays an important role in its erosion resistance [33,50].…”

Section: Vickers Hardness Test Resultsmentioning

confidence: 99%

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Almomani¹,

Al‐Widyan²,

Mohaidat³

2020

JMES

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The high strength-to- weight ratio of titanium alloys allows their use in jet engines. However, their use is restricted by susceptibility to oxidation at high temperatures. In this study, the possibility of increasing the operating temperature of titanium alloys through using Yttrium Aluminum Oxide (YAG) as a thermal barrier coating material for Ti-6Al-4V substrate is studied. The study concludes that YAG can be utilized to increase the operating temperature of Ti-6Al-4V titanium alloy from around 350 °C to 800 °C due to its low thermal conductivity and phase stability up to its melting point. In addition, its lower oxygen diffusivity in comparison with the standard YSZ material will provide a better protection of the titanium substrate from oxidation. In this work, coating was created using atmospheric plasma spray. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were used to examine coatings' composition and structure. The coating was characterized by thermal shock test, Vickers hardness test and adhesion strength test. X-ray diffraction indicated that the coating was of a partially crystalline Y3Al5O12 composition. The coating was porous with excellent thermal shock resistance at 800 oC, with a Vickers micro-hardness of 331.35 HV and adhesion strength of 17.6 MPa.

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“…The main role of the topcoat is to insulate the components against heat and exhaust gas flows in the service environment. Topcoats are usually sprayed on the bondcoat by APS [8,9], suspension plasma spraying (SPS) [10], or electron beam physical vapor deposition (EB-PVD) [11,12]. Because of the relatively low costs and high deposition efficiency, APS has been widely accepted in industry [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effects of Selective Laser Modification and Al Deposition on the Hot Corrosion Resistance of Ceria and Yttria-Stabilized Zirconia Thermal Barrier Coatings

Zhang

et al. 2019

Coatings

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The air-plasma-sprayed ceria and yttria-stabilized zirconia (CYSZ) coating was modified by selective laser remelting and Al deposition to enhance hot corrosion resistance. The dotted coating was obtained after selective laser remelting. Magnetron sputtering was used to deposit an Al film on the dotted coating, and a vacuum heat treatment was subsequently performed to produce a dense α-Al2O3 overlay. Hot corrosion behavior of the following three types of coatings was investigated: plasma-sprayed, dotted, and dotted coatings combined with Al deposition (DA). Hot corrosion behaviors were evaluated in a mixture of 55 wt % V2O5 and 45 wt % Na2SO4 molten salts at 1000 °C for 30 h. The hot corrosion reaction between molten salts and zirconia stabilizers (Y2O3 and CeO2) led to the generation of monoclinic zirconia, YVO4, and CeVO4 plate-shaped crystals, and the mineralization of CeO2. The results indicated that the hot corrosion resistance of the DA coating was the best, and the dotted coating had superior hot corrosion resistance in comparison with the plasma-sprayed coating. The minimal surface roughness and dense dotted units improved the hot corrosion resistance of the dotted coating. The dense α-Al2O3 overlay with chemical inertness effectively inhibited the infiltration of molten salts, which led to the optimal hot corrosion resistance of the DA coating.

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Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Cited by 38 publications

References 42 publications

Erosion behavior of CMAS/VA infiltrated EB-PVD Gd2Zr2O7 TBCs: Special emphasis on the effect of mechanical properties of the reaction products

Erosion behavior of CMAS/VA infiltrated EB-PVD Gd2Zr2O7 TBCs: Special emphasis on the effect of mechanical properties of the reaction products

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Effects of Selective Laser Modification and Al Deposition on the Hot Corrosion Resistance of Ceria and Yttria-Stabilized Zirconia Thermal Barrier Coatings

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