Synthesis and characterization of Y3Al5O12 and ZrO2–Y2O3 thermal barrier coatings by combustion spray pyrolysis

Saravanan, S.; Srinivas, G.; Jayaram, Vikram; Paulraj, Mosae Selvakumar; Asokan, S.

doi:10.1016/j.surfcoat.2008.03.029

Cited by 16 publications

(4 citation statements)

References 22 publications

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“…The surface of the coating after the thermal shock shows that the coating experienced no spallation at the center and the delamination took place at the edges of the coating as shown in Figure 6, with a spallation area of less than 5% of the coating, delamination at the edges of the coating can be caused by the large stresses due to edge effect and discontinuous coating thickness [29]. Also, cracks and pores can be observed in Figure 6.…”

Section: Thermal Shock Resistancementioning

confidence: 98%

“…The coating was porous with excellent thermal shock resistance at 800 o C, with a Vickers micro-hardness of 331.35 HV and adhesion strength of 17.6 MPa. journal.ump.edu.my/jmes ◄ phase change up to its melting temperature [24].YAG has also superior creep and corrosion resistance [25,26].YAG performance as a TBC material can be enhanced by doping with Yb 3+ ions which leads to reduced thermal conductivity and increased coefficient of thermal expansion [27,28].Therefore, several technologies were used to apply YAG coating such as combustion spray pyrolysis [29], electrostatic spray assisted vapor deposition [33], atmospheric plasma spraying [31,32] and solution precursor plasma spray [33].Based on our extensive literature search, the synthesis and study of YAG-based TBC for titanium alloys was not conducted before. Hence, this work aims to create a YAG TBC over Ti-6Al-4V alloy using the atmospheric plasma spray process.…”

Section: Introductionmentioning

confidence: 99%

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Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Almomani¹,

Al‐Widyan²,

Mohaidat³

2020

JMES

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The high strength-to- weight ratio of titanium alloys allows their use in jet engines. However, their use is restricted by susceptibility to oxidation at high temperatures. In this study, the possibility of increasing the operating temperature of titanium alloys through using Yttrium Aluminum Oxide (YAG) as a thermal barrier coating material for Ti-6Al-4V substrate is studied. The study concludes that YAG can be utilized to increase the operating temperature of Ti-6Al-4V titanium alloy from around 350 °C to 800 °C due to its low thermal conductivity and phase stability up to its melting point. In addition, its lower oxygen diffusivity in comparison with the standard YSZ material will provide a better protection of the titanium substrate from oxidation. In this work, coating was created using atmospheric plasma spray. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were used to examine coatings' composition and structure. The coating was characterized by thermal shock test, Vickers hardness test and adhesion strength test. X-ray diffraction indicated that the coating was of a partially crystalline Y3Al5O12 composition. The coating was porous with excellent thermal shock resistance at 800 oC, with a Vickers micro-hardness of 331.35 HV and adhesion strength of 17.6 MPa.

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Section: Thermal Shock Resistancementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Almomani¹,

Al‐Widyan²,

Mohaidat³

2020

JMES

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“…For example, introduction of 3 mol% Y 2 O 3 in zirconia allows the preparation of engineering ceramics with high values of bending strength and fracture toughness [1]. Such characteristics as thermal expansion coefficient close to that of super alloys, low thermal conductivity, and high erosion resistance make zirconia ceramics with Y 2 O 3 content in the range of 6-8 mol% very suitable materials for thermal barrier coatings [3]. Ceramics containing 8-10 mol% of Y 2 O 3 are used in solid fuel cells as electrolyte material due to the high oxygen ion conductivity [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Phase Composition of Yttria-Stabilized Zirconia Nanofibers Prepared by High-Temperature Calcination of Electrospun Zirconium Acetylacetonate/Yttrium Nitrate/Polyacrylonitrile Fibers

Rodaev

Razlivalova

Tyurin

et al. 2019

Fibers

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For the first time, dense nanofibers of yttria-stabilized tetragonal zirconia with diameter of ca. 140 nm were prepared by calcination of electrospun zirconium acetylacetonate/yttrium nitrate/polyacrylonitrile fibers at 1100–1300 °C. Ceramic filaments were characterized by scanning electron microscopy, X-ray diffractometry, and nitrogen adsorption. With a rise in the calcination temperature from 1100 to 1300 °C, the fine-grain structure of the nanofibers transformed to coarse-grain ones with the grain size equal to the fiber diameter. It was revealed that fully tetragonal nanofibrous zirconia may be obtained at Y2O3 concentrations in the range of 2–3 mol% at all used calcination temperatures. The addition of 2–3 mol% yttria to zirconia inhibited ZrO2 grain growth, preventing nanofibers’ destruction at high calcination temperatures. Synthesized well-sintered, non-porous, yttria-stabilized tetragonal zirconia nanofibers can be considered as a promising material for composites’ reinforcement, including composites with ceramic matrix.

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“…To protect the underlying structure, these coatings must be composed of materials that are chemically inert, and structurally stable under operating conditions and that possess thermal expansion coefficients that approximately match the underlying material . Various previous studies have focused on novel materials and new deposition methods to improve the performance of various oxidation resistant barriers. In this work, we report the use of atomic layer deposition (ALD), which is highly controllable and scalable, to deposit oxidation resistant protective films .…”

Section: Introductionmentioning

confidence: 99%

Nanostructured mullite steam oxidation resistant coatings for silicon carbide deposited via atomic layer deposition

et al. 2018

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Oxidation resistant, thin, pinhole‐free, crystalline mullite coatings were deposited on zirconia and silicon carbide particles using atomic layer deposition (ALD). The composition of the films was confirmed with inductively coupled plasma optical emission spectroscopy (ICP OES), and the conformality and elemental dispersion of the films were characterized with transmission electron microscopy (TEM) and energy dispersive X‐ray spectroscopy (EDS), respectively. The films are deposited on the particle surface with a deposition rate of ~1 Å/cycle. The elemental concentration of aluminum relative to silicon in the film was determined to be 2.68:1 which agrees closely with the ratio of stable 3:2 mullite (2.88:1). A high‐temperature anneal for 5 hours at 1500°C was used to crystallize the films into the mullite phase. This work represents the first deposition of mullite films by ALD. The mullite and alumina‐coated particles were exposed to high‐temperature steam for 20 hours at 1000°C to assess the oxidation resistance of the films, which reduced the oxidation of silicon carbide by up to 62% relative to uncoated particles under these conditions. The activation energy of oxygen diffusion in the films was determined with density functional theory, and the computational results aligned well with the experimental outcomes.

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Synthesis and characterization of Y3Al5O12 and ZrO2–Y2O3 thermal barrier coatings by combustion spray pyrolysis

Cited by 16 publications

References 22 publications

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Microstructure and Phase Composition of Yttria-Stabilized Zirconia Nanofibers Prepared by High-Temperature Calcination of Electrospun Zirconium Acetylacetonate/Yttrium Nitrate/Polyacrylonitrile Fibers

Nanostructured mullite steam oxidation resistant coatings for silicon carbide deposited via atomic layer deposition

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