Isothermal oxidation and thermal cyclic behaviors of YSZ and double-layered YSZ/La2Zr2O7 thermal barrier coatings (TBCs)

Döleker, Kadir Mert; Ozgurluk, Yasin; Karaoğlanlı, Abdullah Cahit

doi:10.1016/j.surfcoat.2018.07.069

Cited by 83 publications

(25 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Alumina is a stable oxide that grows very slowly during oxidation and provides high resistance against oxygen penetration. It prevents exposure of the fresh surface as well as adhesive wear and thus prevents further wear damage [15,26,27]. It should be noted that the matrix grains of the CoCrFeNiTi 0.5 Al 0.5 alloy consist of BCC2 (Al-Ni-Ti), whereas the intragranular phase surrounding these grains is the BCC1 (FeCr) phase.…”

Section: Hardness and Dry Sliding Wear Analysismentioning

confidence: 99%

Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

2019

View full text Add to dashboard Cite

In this study, CoCrFeNiTi 0.5 Al x high-entropy alloys were produced by induction melting and their dry sliding wear behavior was examined at different temperatures. In addition to face-centered cubic (FCC) phases, low amounts of a tetragonal phase were detected in the microstructures of alloys without Al and microscratches were formed by wear particles on the worn surfaces of the alloy specimens. Two body-centered cubic (BCC) phases were detected in the alloy with 0.5Al and a fatigue-related extrusion wear mechanism was detected on the worn surface. The alloy specimen with a high Al content exhibited the best wear characteristics. No wear tracks were formed in single-phase BCC intermetallic alloys at room temperature and they exhibited a higher wear strength at high temperatures when compared to other samples.

show abstract

Section: Hardness and Dry Sliding Wear Analysismentioning

confidence: 99%

Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

2019

View full text Add to dashboard Cite

show abstract

“…Due to this reaction, the TGO layer grows by the metallic BC selective oxidation and is mainly composed of alumina. One of the main reasons for cracking, delamination, and spallation of YSZ has been reported to be the TGO layer growth [24][25][26][27].…”

Section: Structure Of Tbcsmentioning

confidence: 99%

“…Gd 2 Zr 2 O 7 and La 2 Zr 2 O 7 are common examples of these pyrochlore oxides. These materials typically have a lower thermal conductivity, a higher melting point, and a relatively higher TEC compared to YSZ, which makes them suitable for TBC [24,[47][48][49].…”

Section: New Tbcsmentioning

confidence: 99%

A review on development and application of self-healing thermal barrier composite coatings

Abuchenari

Ghazanfari

Siavashi

et al. 2020

jcc

View full text Add to dashboard Cite

To improve the hot section metallic parts durability in advanced gas-turbine operating in power generation and aircraft, thermal barrier coating (TBCs) are extensively utilized to increase their lifetime. The reason for applying coatings on these components is the improvement of their physical properties, mechanical properties, and outer look. The self-repairing ability of materials is very promising due to expanding the service time of materials and it is also beneficial in terms of human safety and financial aspects. In this review article, structure, properties, limitations, and the modification approaches of TBCs were studied. In addition, self-healing agents for TBCs including SiC, MoSi 2 , TiC were introduced, which release their oxide by reaction with air and O 2 that are able to heal the pores/cracks in the coatings. In this regard, their coating methods, mechanism, and applications in TBCs were reviewed.

show abstract

“…On the other hand, a new ceramic material for thermal barrier coating, La 2 Zr 2 O 7 (Lanthanum zirconate, abbreviations LZ), has attracted great attention due to its high melting point (2574 K), low thermal conductivity (1.6 W/(m•K)), low density (6.05 g /cm 3 ), low thermal expansion coefficient (9.1 × 10 −6 /K), no phase transition between room temperature and melting point, and no oxygen pentration [4]. For example, Doleker et al [5] found that the high temperature oxidation at 1000 • C and thermal shock at room temperature~1150 • C of the LZ/YSZ double ceramic layer were better than that of the single layer YSZ coating when the bond coat was all CoNiCrAlY. Satpathy et al [6] found that LZ and YSZ had good long-term physical compatibility and better thermal insulation after the preparation of nanometer LZ/YSZ double ceramic layer, by testing the durability of an aircraft engine.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Isothermal oxidation and thermal cyclic behaviors of YSZ and double-layered YSZ/La2Zr2O7 thermal barrier coatings (TBCs)

Cited by 83 publications

References 53 publications

Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

A review on development and application of self-healing thermal barrier composite coatings

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

Contact Info

Product

Resources

About