Microstructural Characterization and Room-Temperature Erosion Behavior of As-Deposited SPS, EB-PVD and APS YSZ-Based TBCs

Lima, Rogerio S.; Guerreiro, Bruno; Aghasibeig, Maniya

doi:10.1007/s11666-018-0763-6

Cited by 32 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As well known, for ceramics under solid particle erosion the material is removed by fracturing, and the extent of cracking associated with single impact increases with the depth of penetration of the erodent particle, which can be achieved in maximum at 90° impact angle [121]. This in turn means highest effectiveness of the energy transfer of the incident [79]. The erosion rate results obtained are in agreement with the common response of plasma-sprayed TBC coatings impacted by solid particles [122].…”

Section: Erosion Ratessupporting

confidence: 84%

“…It has been reported that TBCs are more susceptible to erosion than fully dense ceramics because the coating microstructures contain many cracks [73]. Between the two microstructures of YSZ top coat, the columnar-segmented microstructure was better than columnar-grown microstructure in resistance to solid particle erosion [79], as presented in [84].…”

Section: Erosion Of Tbcsmentioning

confidence: 96%

“…The phase analyses of the top surface in the as-deposited TBC specimen for solid particle erosion test were carried out with XRD. The peaks in the XRD diffraction pattern were identified using JCPDS #48-0224 standard [79]. As shown in Figure 5.3, the coating was tetragonal t' phase of partially stabilized zirconia.…”

Section: Microstructure Of Tbc Specimen For Solid Particle Erosion Testmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and Modeling Studies of Thermal Barrier Coating Failure Under Isothermal Oxidation and Solid Particle Erosion

Essa¹

View full text Add to dashboard Cite

Section: Erosion Ratessupporting

confidence: 84%

Section: Erosion Of Tbcsmentioning

confidence: 96%

Section: Microstructure Of Tbc Specimen For Solid Particle Erosion Testmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Modeling Studies of Thermal Barrier Coating Failure Under Isothermal Oxidation and Solid Particle Erosion

Essa¹

View full text Add to dashboard Cite

“…The calcium-magnesium-alumino-silicate (CMAS) corrosion is believed to be one critical failure mechanisms which causes the open structure of TBC [9][10][11]. CMAS is a kind of mixed oxides usually coming from sand, runway debris, volcanic ash, air pollution, or fly ash [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Thermal and Mechanical Behaviours of Thermal Barrier coatings Exposed to CMAS Corrosion

Li¹,

Jiang

Gao

et al. 2020

Preprint

View full text Add to dashboard Cite

Calcium-magnesium-alumino-silicate (CMAS) corrosion is one of the most critical failure mechanisms of thermal barrier coating (TBC). CMAS attack significantly alters the temperature and stress fields in TBCs, resulting in their delamination or spallation. In this work, the dynamic evolution process of suspension plasma sprayed (SPS) TBC under CMAS attack is investigated. The CMAS corrosion leads to the formation of reaction layer and subsequent bending of TBC. Based on the observations, a corrosion model is proposed to describe the generation and evolution of the reaction layer and bending of TBC. Then, numerical simulations are performed to investigate the corrosion process of free-standing TBC and the complete TBC system under CMAS attack, respectively. Results show that the CMAS corrosion has a significant influence on the stress field, such as the peak stress, while it has little influence on the steady state temperature field. It should be noted that the peak of stress increases with holding time which increases the risk of the rupture of TBC. There is a parabolic relationship between the stress and reaction layer thickness in the holding stage. Furthermore, in the traditional failure zone, such as the interface of top coat and bond coat, the stress obviously change during CMAS corrosion.

show abstract

“…The state of art topcoat material is 6-8 wt.% yttria-stabilized zirconia (YSZ) ceramic coating, which provides the advantages of low thermal conductivity, high thermal-expansion coefficient, and high fracture toughness [9][10][11]. YSZ topcoat can be deposited by mainly two methods: electron beam physical vapor deposition (EB-PVD) and air plasma spray method (APS) [12][13][14]. Interlayer bondcoat is between bond topcoat and substrate, which protects the superalloy substrate from being oxidized in severe environments and serves the critical role of providing adhesion between the substrate and the topcoat [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Al Sputtering Film on the Oxidation Behavior of NiCrAlY Bondcoat

Zhang

Yang³

et al. 2020

Coatings

View full text Add to dashboard Cite

In this study, the oxidation behavior of Al coated NiCrAlY bondcoat is investigated. It is known that many methods are applied to improve the lifetime of bondcoat in thermal barrier coatings. Herein, the Al sputtering method is selected to increase the Al content, which does not change the structure of bondcoat. Thin Al film of ~2 µm was sputtered on the surface of bondcoat, which improved the oxidation resistance of NiCrAlY bondcoat. Experimental results showed that, after oxidation for 200 h at 1200 °C, the formation of a dense and continuous α-Al2O3/Cr2O3 multilayer was observed on the Al coated bondcoat surface. In contrast, a mixed oxides (NiO, Cr2O3 and spinel oxides) layer formed on the surface of the as-sprayed bondcoat samples. Results of the cyclic oxidation at 1050 °C within 204 h indicated that the Al sputtering method can improve the oxidation resistance of bondcoat. This study offers a potential way to prolong the lifetime of thermal barrier coatings and provides analysis of the oxidation mechanism.

show abstract

Microstructural Characterization and Room-Temperature Erosion Behavior of As-Deposited SPS, EB-PVD and APS YSZ-Based TBCs

Cited by 32 publications

References 15 publications

Experimental and Modeling Studies of Thermal Barrier Coating Failure Under Isothermal Oxidation and Solid Particle Erosion

Experimental and Modeling Studies of Thermal Barrier Coating Failure Under Isothermal Oxidation and Solid Particle Erosion

Experimental and Numerical Investigation on the Thermal and Mechanical Behaviours of Thermal Barrier coatings Exposed to CMAS Corrosion

Effects of Al Sputtering Film on the Oxidation Behavior of NiCrAlY Bondcoat

Contact Info

Product

Resources

About