Thermal Barrier Coatings Based on ZrO2 Solid Solutions

Dudnik, E. V.; Lakiza, S. M.; Hrechanyuk, I.N.; Ruban, A. K.; Red’ko, V. P.; Marek, Ivo; Shmibelsky, V.B.; Makudera, A. A.; Hrechanyuk, N. I.

doi:10.1007/s11106-020-00151-8

Cited by 11 publications

(4 citation statements)

References 112 publications

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“…This discrepancy in results between the bulk and coated samples suggests the potential formation of a non-transformable tetragonal phase (t phase), one closely resembling the cubic phase, within the crystal structure of the coated sample deposited in a vacuum environment. Furthermore, considering prior research on the correlation between phases and mechanical properties of zirconia, we speculate that the tetragonal phase will be more pronounced following the oxidative heat treatment [20,25]. Consequently, we expect improved mechanical properties in the coating sample after the oxidative heat treatment compared with its state after high vacuum deposition.…”

Section: Discussionmentioning

confidence: 80%

“…Consequently, we expect improved mechanical properties in the coating sample after the oxidative heat treatment compared with its state after high vacuum deposition. This expectation is based on the fracture toughness variation of YSZ with the phase of zirconia, and it is known that tetragonal-phase zirconia has higher fracture toughness than cubic-phase zirconia [24,25]. However, further experiments are required to validate these expectations.…”

Section: Discussionmentioning

confidence: 99%

“…When the EB-PVD is used, the resulting coating layer has a columnar structure with gaps between the columns, leading to a higher thermal conductivity than those of APS-manufactured coatings. However, EB-PVD-derived layers exhibit excellent mechanical properties such as adhesion and are thus preferred for aviation gas turbine parts [25][26][27][28][29]. Notably, the EB-PVD process requires a high-vacuum environment for YSZ deposition, and the YSZ is evaporated by an electron beam in such conditions [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Oxidation-Induced Changes in the Lattice Structure of YSZ Deposited by EB-PVD in High-Vacuum Conditions

Lee,

2023

Processes

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Yttria-stabilized zirconia (YSZ), a thermal barrier coating material characterized by low thermal conductivity, is typically deposited via electron beam-physical vapor deposition. Notably, oxygen depletion occurs during this process, causing color changes in YSZ. Therefore, YSZ is speculated to undergo phase transformation during this process, which demands careful consideration owing to its effect on the life of thermal coatings. To study this phenomenon, bulk samples were prepared, subjected to vacuum heat treatment to induce oxygen depletion, and followed by oxidative heat treatment. Experimental results showed that the color of the samples changed to black after the vacuum heat treatment and to a lighter color after the oxidative heat treatment. In addition, X-ray diffraction and Raman analyses were performed. The monoclinic phase formation was confirmed during the vacuum heat treatment; however, it disappeared after the oxidation heat treatment. The coating obtained in a high vacuum atmosphere exhibited a black color and cubic phase, which changed to a bright color and tetragonal phase after the oxidation heat treatment.

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation-Induced Changes in the Lattice Structure of YSZ Deposited by EB-PVD in High-Vacuum Conditions

Lee,

2023

Processes

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“…The BC layer typically ranges from 50-150 µm, and the TGO can vary from a few nanometers up to 5 µm (it has been reported that at more than 6 µm spallation, failure happens [8]). On the other hand, the TC has a thickness in the range of 200-300 µm [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Study on Long-Term Oxidation and Thermal Shock Performance of Nanostructured YSZ/NiCrAlY TBC with a Less Dense Bond Coat

2023

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This paper focused on studying the performance of a nanostructured thermal barrier coating (TBC) system deposited by APS, which had a bond coat with inter-lamellar porosities that resulted during the manufacturing process. The higher porosity level of the bond coat was studied as a possible way to keep the thickness of the TGO under control, as it is distributed on a higher surface, thereby reducing the chance of top-coat (TC) spallation during long-term oxidation and high-temperature thermal shock. The TBC system consisted of nanostructured yttria partially stabilized zirconia (YSZ) as a top coat and a conventional NiCrAlY bond coat. Inter-lamellar porosities ensured the development of a TGO distributed on a higher surface without affecting the overall coating performance. Based on long-term isothermal oxidation tests performed at 1150 °C, the inter-lamellar pores do not affect the high resistance of nanostructured TBCs in case of long-term iso-thermal oxidation at 1150 °C. The ceramic layer withstands the high-temperature exposure for 800 h of maintaining without showing major exfoliation. Fine cracks were discovered in the ceramic coating after 400 h of isothermal oxidation, and larger cracks were found after 800 h of exposure. An increase in both ceramic and bond-coat compaction was observed after prolonged high-temperature exposure, and this was sustained by the higher adhesion strength. Moreover, in extreme conditions, under high-temperature thermal shock cycles, the TBC withstands for 1242 cycles at 1200 °C and 555 cycles at 1250 °C.

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High-Entropy Ceramics for Thermal Barrier Coatings Produced from ZrO2 Doped with Rare-Earth Metal Oxides

Дуднік

Lakiza

Grechanyuk

et al. 2021

Powder Metall Met Ceram

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Thermal Barrier Coatings Based on ZrO2 Solid Solutions

Cited by 11 publications

References 112 publications

Oxidation-Induced Changes in the Lattice Structure of YSZ Deposited by EB-PVD in High-Vacuum Conditions

Oxidation-Induced Changes in the Lattice Structure of YSZ Deposited by EB-PVD in High-Vacuum Conditions

A Study on Long-Term Oxidation and Thermal Shock Performance of Nanostructured YSZ/NiCrAlY TBC with a Less Dense Bond Coat

High-Entropy Ceramics for Thermal Barrier Coatings Produced from ZrO2 Doped with Rare-Earth Metal Oxides

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