Thermo-physical properties of rare-earth hexaaluminates LnMgAl11O19 (Ln: La, Pr, Nd, Sm, Eu and Gd) magnetoplumbite for advanced thermal barrier coatings

Lü, Heng; Wang, Chang‐An; Zhang, Chenguang; Shuyan, Tong

doi:10.1016/j.jeurceramsoc.2014.10.030

Cited by 77 publications

(3 citation statements)

References 36 publications

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“…The energy efficiency of a gas-turbine engine is highly dependent on the operating temperature of its hot sections, which can be greatly increased by the application of thermal barrier coatings (TBCs) [1][2][3][4]. Although many candidates of TBCs have rapidly developed, such as pyrochlore-structured La 2 Zr 2 O 7 , fluorite-structured La 2 Ce 2 O 7 , magnetoplumbite-type LnMgAl 11 O 19 (Ln: La, Gd, Nd et al) and perovskite-type BaZrO 3 or SrZrO 3 , yttria stabilized zirconia (YSZ) is still an irreplaceable material for TBCs due to its good mechanical and thermal properties [5][6][7][8][9]. In particular, the nanostructured YSZ coatings showed superior strain tolerance and thermal insulation performance owing to their typical bimodal structure, in which many unmelted nano-particles (UNPs) were randomly distributed [10,11].…”

Section: Introductionmentioning

confidence: 99%

A Simulation Study on the Crack Propagation Behavior of Nanostructured Thermal Barrier Coatings with Tailored Microstructure

et al. 2020

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The initiation and propagation of cracks are crucial to the reliability and stability of thermal barrier coatings (TBCs). It is important and necessary to develop an effective method for the prediction of the crack propagation behavior of TBCs. In this study, an extended finite element model (XFEM) based on the real microstructure of nanostructured TBCs was built and employed to elucidate the correlation between the microstructure and crack propagation behavior. Results showed that the unmelted nano-particles (UNPs) that were distributed in the nanostructured coating had an obvious “capture effect” on the cracks, which means that many cracks easily accumulated in the tensile stress zone of the adjacent UNPs and a complex microcrack network formed at their periphery. Arbitrarily oriented cracks mainly propagated parallel to the x-axis at the final stage of thermal cycles and the tensile stress was the main driving force for the spallation failure of TBCs. Correspondingly, I and I–II mixed types of cracks are the major cracking patterns.

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Section: Introductionmentioning

confidence: 99%

A Simulation Study on the Crack Propagation Behavior of Nanostructured Thermal Barrier Coatings with Tailored Microstructure

et al. 2020

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“…Although yttria-partially-stabilized zirconia (Y-PSZ) is the proposed material for TBC applications, the deterioration observed in its thermo-physical properties at 1100 o C means that other materials, such as hexaaluminates, may also be a good option. [141][142][143][144][145] Indeed, hexaaluminates permit operating temperatures above 1300 o C because of their thermal stability and electrically insulating properties. Several methods have been proposed to produce homogeneous coatings, including atmospheric plasma spraying (APS), electronbeam physical vapor deposition (EB-PVD), low-pressure plasma spraying (LPPS), high-velocity oxygen fuel spraying (HVOF), and chemical vapor deposition (CVD).…”

Section: Thermal Insulation and Oxidation Protectionmentioning

confidence: 99%

Progress in the synthesis and applications of hexaaluminate-based catalysts

2020

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The development of materials that can exhibit thermal resistance at very high temperatures, thus allowing them to be applied as catalysts and thermal insulators, amongst other possible uses, is a research subject of great interest. This is the case for hexaaluminates, a class of hexagonal aluminate compounds with a unique structure that are stable at very high temperatures up to 1600 o C and exhibit exceptional resistance to sintering and thermal shock, thus making them attractive catalysts for high-temperature applications. In this review, the structure of hexaaluminates is presented first. The most recent advances in synthetic methods (sol-gel, reverse microemulsion, hydrothermal synthesis, carbontemplating, solution combustion synthesis and freeze drying methods) are discussed subsequently, with the aim of maximizing textural properties and including in their structure metals known to be active in catalytic applications, such as combustion of CH4, partial oxidation and dry reforming of CH4 to produce synthetic gas, and the decomposition of N2O.Finally, other applications, such as their function as a thermal barrier, are also addressed.

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“…When pumped with light, erbium ions can efficiently amplify optical signals without frequent electronic regeneration. This enables long-distance and high-capacity data transmission [7,8]. Erbium-doped fibers are employed in the development of sensitive fiber optic sensors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Optical Properties of Erbium-Doped Sodium Silicate in Sol-Gel Matrix

Mansour,

Abou Hammad,

El Nahrawy

2024

Silicon

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In this study, we investigated how the concentration of erbium (0.0, 1, 2 mol% Er) affects the structural and optical properties of thin films made from sol-gel sodium silicate doped with erbium nitrate, thermally treated at 250 °C. Through systematic investigation, we explore the structural evolution and optical behavior of the thin films across varying Er3+ concentrations. The sol-gel demonstrated effective capabilities for substantial concentrations of Er3+ oxides through doping at lower calcination temperatures. The spectroscopic characteristics were studied using visible-near infrared spectroscopy (UV–vis–NIR), transmission electron microscopy, and Fourier transform infrared spectroscopy. Increasing the Er ratio decreased both the transmission and the energy band gap (3.6–3.34 eV) of the films while the absorption peak increased. The obtained results suggest that Er3+ activators demonstrate advantageous optical properties in the evaluated sodium silicate glass matrix. With the introduction of Er, optical transmittance ranges from 85 to 55% in the visible and near-infrared (NIR) regions, highlighting their advantageous characteristics. This research contributes to advancing the understanding of erbium-doped thin films for potential applications in optoelectronic devices and photonics.

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Thermo-physical properties of rare-earth hexaaluminates LnMgAl11O19 (Ln: La, Pr, Nd, Sm, Eu and Gd) magnetoplumbite for advanced thermal barrier coatings

Cited by 77 publications

References 36 publications

A Simulation Study on the Crack Propagation Behavior of Nanostructured Thermal Barrier Coatings with Tailored Microstructure

A Simulation Study on the Crack Propagation Behavior of Nanostructured Thermal Barrier Coatings with Tailored Microstructure

Progress in the synthesis and applications of hexaaluminate-based catalysts

Synthesis and Optical Properties of Erbium-Doped Sodium Silicate in Sol-Gel Matrix

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