Microstructure and Creep Behavior of Plasma-Sprayed Yttria Stabilized Zirconia Thermal Barrier Coatings

Soltani, Reza; Coyle, Thomas W.; Mostaghimi, J.

doi:10.1007/s11666-008-9166-4

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…At high temperatures (on the order of 1400°C) this initial stage of sintering is followed by healing of the interspat cracks and thereby to a progressive increase in modulus. Similar microstructural changes have been observed in creep and sintering experiments by Soltani et al [8]. Thompson and Clyne [4] also examined the sintering response of a coating constrained by a substrate.…”

Section: Introductionsupporting

confidence: 58%

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Constrained sintering of an air-plasma-sprayed thermal barrier coating

Cocks

Fleck

2010

Acta Materialia

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Section: Introductionsupporting

confidence: 58%

“…At any given state, the macroscopic elastic strain is specified by Eq. (8), in terms of the bridging traction T as given by Eq. (12).…”

Section: The Free Energy and The Variational Statementmentioning

confidence: 99%

Constrained sintering of an air-plasma-sprayed thermal barrier coating

Cocks

Fleck

2010

Acta Materialia

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“…When the interfacial cracks extend to a certain extent, the coating peels off. Many factors can result in the change in stress distributions: the plastic deformation of each layer [ 4 , 5 ]; creep at high temperatures [ 6 , 7 , 8 ]; ceramic sintering [ 9 , 10 , 11 ]; CMAS corrosion; and the impact of foreign objects [ 12 , 13 , 14 ]. The growth stress caused by thermally grown oxide (TGO) is the main cause of coating failure [ 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Understanding of the Effect of TGO Growth Modes on Thermal Barrier Coating Failure Based on a Simulation

Qiao,

Man,

Yan

et al. 2023

Materials

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The growth stress induced by thermally grown oxide (TGO) is one of the main reasons for the failure of thermal barrier coatings (TBCs). In this study, the failure behavior of TBCs was examined based on different growth modes of TGO. A TBC thermo-mechanical model with a simplified sinusoidal interface morphology was established by the secondary development of a numerical simulation. The plasticity and creep behavior of materials were considered. Based on the subroutine development, the non-uniform growth of the TGO layer was realized. Cohesive elements were also applied to the TC/TGO interface. The stress distribution and evolution at the TC/TGO interface were investigated. Then, the cracking behavior near the interface was studied. The results show that lateral growth causes the off-valley site to replace the previous off-peak site as a vulnerable site. The non-uniform growth accelerates damage in the off-valley site, which leads to a change in the failure behavior. These results will provide significant guidance for understanding the TBC failure and the development of advanced TBCs.

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Ultrafine Particulate Dispersed High-Temperature Coatings by Hybrid Spray Process

et al. 2009

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Oxide dispersion strengthened alloys (ODS), although not commonly used in coating applications, have long been used for high-temperature structural applications due to their superior creep properties. In this paper, we present the design, synthesis, and characterization of a new class of functionally engineered high-temperature coatings in which ultrafine oxide particulates are dispersed in the matrix alloy to achieve superior creep resistance along with improved high-temperature corrosion and erosion resistance. These coatings were fabricated using a novel technique called ''hybrid spray process''. Hybrid spray technique combines arc spray and high-velocity oxy fuel (HVOF) spray processes; the metallic matrix alloys are fused by the wire arcing component of the process, whereas the ultrafine particles are synthesized in-flight by the HVOF component from liquid precursors. These particulate dispersed hightemperature composite coatings were fabricated using liquid precursors for SiO 2 , Cr 2 O 3 , Al 2 O 3 , and wire feed stock of 55/45 NiCr, in one step. The coatings were then characterized using electron microscopy (SEM/TEM) and thermogravimetric analysis (TGA). High-temperature erosion, oxidation, and corrosion performance of these coatings were also evaluated and compared with 304 stainless steel, arc sprayed NiCr coatings as well as Alloy 625 overlay cladding. The hybrid spray process produced dense coatings with uniform dispersion of the ultrafine oxide particles. Further, these coatings also demonstrated superior corrosion, erosion, and oxidation resistance; SiO 2 particulate dispersion being most effective in terms of high-temperature corrosion resistance.

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Microstructure and Creep Behavior of Plasma-Sprayed Yttria Stabilized Zirconia Thermal Barrier Coatings

Cited by 13 publications

References 28 publications

Constrained sintering of an air-plasma-sprayed thermal barrier coating

Constrained sintering of an air-plasma-sprayed thermal barrier coating

Comprehensive Understanding of the Effect of TGO Growth Modes on Thermal Barrier Coating Failure Based on a Simulation

Ultrafine Particulate Dispersed High-Temperature Coatings by Hybrid Spray Process

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