Lanthanum zirconate based thermal barrier coatings: A review

Zhang, Jing; Guo, Xingye; Jung, Yeon Gil; Li, Li; Knapp, James

doi:10.1016/j.surfcoat.2016.10.019

Cited by 184 publications

(66 citation statements)

References 89 publications

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“…This indicates that the La2Zr2O7 coating can protect the GH4169 substrate from oxidation. The reason is that both the oxygen vacancy mobility and the oxygen ion conductivity of La2Zr2O7 are very low [32], and La2Zr2O7 is a ceramic material with extremely low oxygen permeability, which is basically no oxygen permeability material [4,33]. In addition, the oxidation weight gain rate of the La2Zr2O7 coating is about two-thirds of that of the GH4169 substrate at 1100 °C for 110 h. Figures 8 and 9 show the XRD patterns of different samples after high temperature oxidation at 1100 °C for 110 h, respectively.…”

Section: High Temperature Oxidation Propertiesmentioning

confidence: 99%

High Temperature Oxidation and Thermal Shock Properties of La2Zr2O7 Thermal Barrier Coatings Deposited on Nickel-Based Superalloy by Laser-Cladding

Huang

Pan

et al. 2020

Coatings

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In order to reduce the difficulty and cost of manufacturing and improve the high temperature oxidation and thermal shock properties of nickel-based superalloy, a thin La2Zr2O7 thermal barrier coating without bond coat was successfully prepared by laser-cladding using La2Zr2O7 powders on a nickel-based superalloy substrate. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods were used to characterize the microstructure of the coating. The high temperature oxidation and thermal shock properties of the coating were evaluated by the air isothermal oxidation method at 1100 °C for 110 h and thermal cycling method at 25~1100 °C, respectively. The results show that the coating is mainly composed of La2Zr2O7 phase. The oxidation weight gain rate of the coating is about two-thirds of that of the substrate, and the first crack thermal shock lifetime of the coating is about 1.67 times of that of the substrate. The oxidation products of the coating are mainly Fe2O3, Cr2O3, NiCr2O4, Nb2O5 and La2Zr2O7. The existence of La2Zr2O7 phase in the coating is the main reason for the improvement of its oxidation resistance at 1100 °C and its thermal shock resistance at 25~1100 °C.

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Section: High Temperature Oxidation Propertiesmentioning

confidence: 99%

High Temperature Oxidation and Thermal Shock Properties of La2Zr2O7 Thermal Barrier Coatings Deposited on Nickel-Based Superalloy by Laser-Cladding

Huang

Pan

et al. 2020

Coatings

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“…In cyclic thermal exposure environments, thermally-induced residual stress forms in the TBC multilayers because of differential coefficients of thermal expansion in each layer [30,31]. In this work, a linear elastic analytical model was employed to understand the residual stress distribution and resultant cracking phenomena, as in [30][31][32][33]. In the model, the interface between the substrate and the bond coat was defined as the origin line, where z = 0.…”

Section: Modeling Of Residual Stress and Crack-growth Behavior In Tbcmentioning

confidence: 99%

Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure

Song

Song²,

Paik³

et al. 2019

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Crack-growth behavior in yttria-stabilized zirconia-based thermal barrier coatings (TBCs) is investigated through a cyclic thermal fatigue (CTF) test to understand TBCs' failure mechanisms. Initial cracks were introduced on the coatings' top surface and cross section using the micro-indentation technique. The results show that crack length in the surface-cracked TBCs grew parabolically with the number of cycles in the CTF test. Failure in the surface-cracked TBC was dependent on the initial crack length formed with different loading levels, suggesting the existence of a threshold surface crack length. For the cross section, the horizontal crack length increased in a similar manner as observed in the surface. By contrast, in the vertical direction, the crack did not grow very much with CTF testing. An analytical model is proposed to explain the experimentally-observed crack-growth behavior.

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“…Lanthanum zirconate (La 2 Zr 2 O 7 ) is a typical pyrochlore structure ceramic material (Zhang et al, 2016) with many interesting industrial) applications including thermal barrier coating (TBC) (Cao et al, ABSTRACT Lanthanum Zirconate (La 2 Zr 2 O 7 ) nanoparticles (NPs) are generally used in blades of gas turbine engines to thermally insulate them and to protect them against hot and corrosive gas streams. The present research experiment was aimed to determine the effect of Lanthanum Zirconate NPs on selected aspects of behavior, serum biochemistry, complete blood count and antioxidant metabolites from vital organs of albino mice in a gender specific manner.…”

Section: Introductionmentioning

confidence: 99%