Degradation of La2Zr2O7+8YSZ composite TBC systems during oxidation at temperature of 1100°C

Jasik, Anna

doi:10.15199/40.2019.4.1

Cited by 1 publication

(4 citation statements)

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“…The quality of the ceramic top-coat is very high with the porosity absent massive effects (overall integrity, uniform thickness, globular particles, horizontal cracks, contaminations, unmelted particles, interphases cracks between bond-coat and top-coat, adhesion to the substrate, etc.). [8,15]. The presented investigation revealed that the composite system is characterized by a much higher level of porosity (ca.…”

Section: Methodsmentioning

confidence: 83%

“…The effect of the thermal insulation can be strengthened by technological aspects such as the internal structure of coatings containing pores and special architecture of the cracks or interphase boundaries. Good examples of those solutions are thermal barrier coatings of a composite type [6][7][8][9] or double ceramic layer systems [10][11][12]. The concept of composite or DLC TBC systems application, in which a beneficial effect of thermal insulation appears with simultaneous parameters control, such as coefficient of thermal expansion (CTE), toughness, and Young's modulus, is one of the most interesting plans to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

“…The concept of composite or DLC TBC systems application, in which a beneficial effect of thermal insulation appears with simultaneous parameters control, such as coefficient of thermal expansion (CTE), toughness, and Young's modulus, is one of the most interesting plans to solve this problem. Additionally, it ensures a higher resistance to thermal shocks [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…• An optimal value of thermal conductivity (presented in other publications [15]); • High oxidation resistance (TGO zone morphology); and • Thermo-chemical stability between the 8YSZ and Ln 2 Zr 2 O 7 phase (concept of mutual inner thermal barrier coatings [8,16]).…”

Section: Introductionmentioning

confidence: 99%

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Oxidation Behavior of the Monolayered La2Zr2O7, Composite La2Zr2O7 + 8YSZ, and Double-Ceramic Layered La2Zr2O7/La2Zr2O7 + 8YSZ/8YSZ Thermal Barrier Coatings

et al. 2020

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The degradation process of thermal barrier coatings (TBCs) such as monolayered La2Zr2O7, composite 50% La2Zr2O7 + 50% 8YSZ, and double-ceramic layer (DCL) La2Zr2O7/50% La2Zr2O7 + 50% 8YSZ/8YSZ was investigated. Coatings were deposited using the atmospheric plasma spraying (APS) process (ceramic layer and bond-coat) on the Ni-based superalloy substrate with Ni-22Cr-10Al-1Y bond-coat. The thickness of the ceramic top-coats in all cases were 300 µm. In the case of La2Zr2O7/8YSZ, the internal sublayer was built from 8YSZ powder whereas the outer from La2Zr2O7. Between both sublayers’ “composite” a 50% La2Zr2O7 + 50% 8YSZ zone was present. The “composite” 50% La2Zr2O7 + 50% 8YSZ TBC system was sprayed from two different feedstock powders with equal weight ratios. In the first part of the investigation, the microstructural characterization of the TBCs was presented. The main goals were related to the characterization of the degradation processes in different TBC systems with special emphasis on the phenomenon in the thermally grown oxide (TGO) zone related to oxidation, and the phenomenon related to phase stability in ceramic top-coats as related to temperature influence. The oxidation test was carried out in air at 1100 °C for 500 h. In the second step of the investigation, the numerical simulation of the monolayered TBC 8YSZ and La2Zr2O7 systems was analyzed from the stress distribution point of view. Additionally, the two-layered TBC coating of the DCL type was also analyzed.

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Section: Methodsmentioning

confidence: 83%