Investigation about thermophysical properties of Ln2Ce2O7 (Ln=Sm, Er and Yb) oxides for thermal barrier coatings

Zhang, Hongsong; Jinlong, Lv; Li, Gang; Zheng, Zhiping; Wang, Xinli

doi:10.1016/j.materresbull.2012.08.074

Cited by 49 publications

(8 citation statements)

References 33 publications

(48 reference statements)

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“…The specific heat describes the amount of heat required to raise a unit mass of material at a unit temperature. Based on a number of works, Figure 3 shows that CTs have relatively constant heat capacities from ambient to 1000°C [35,47,49,51,53,54,[56][57][58][59][60]. Generally, water, organic compounds and hydroxyl group absorb heat for molecular vibrations; the molecule motions results in kinetic energy transfer to neighbouring particles.…”

Section: Observations From High-temperature Materials Testsmentioning

confidence: 99%

“…Besides fired CTs have unevenly distributed high porosity that reduces thermal conductivities [45,46]. Uneven and small porous structures are a hindrance for conductive heat transfer; and hence show the low thermal conductivity of CTs as reported by [29,45,47-55] (see Figure 2). The thermal conductivity of SOPs (or FRPs) was rarely reported in the literature.…”

Section: Observations From High-temperature Materials Testsmentioning

confidence: 99%

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Ceramic tiles as sustainable, functional and insulating materials to mitigate fire damage

Naser

Thavarajah²

2021

Advances in Applied Ceramics

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Owing to their lower costs and functional properties, the construction industry has been increasingly adopting synthetic organic polymer (SOP) materials into linings, interiors and non-load bearing structural components. While SOPs have favourable properties and characteristics at ambient conditions, the same materials often perform poorly under moderate-to-elevated temperatures such as that arising from a building fire. In fact, most SOPs tend to combust and decompose at elevated temperatures which, unlike traditional building materials such as concrete and ceramic tiles, is proven to not only contribute to the fire but also to adversely affect evacuation and firefighting operations. From a fire engineering perspective, this paper tests a hypothesis in which ceramic tiles (CTs) are expected to outperform SOPs and commonly used insulations as finishing and lining materials under fire conditions. As such, this study showcases a thorough comparison between the behaviour of commonly available CTs, SOPs and insulations in temperatures ranging between 25 and 1000°C. Then, this paper analyses published CT models to derive temperature-dependent material models with the aid of machine learning (ML). Findings of this work advocate the use of CTs as favourable finishing and interior lining materials to enable realising improved structural fire performance and fire response managements, as opposed to SOPs, composites or insulations. The outcome of this work is expected to be of interest to architects, first responders, building officials, fire and structural engineers.

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Section: Observations From High-temperature Materials Testsmentioning

confidence: 99%

Section: Observations From High-temperature Materials Testsmentioning

confidence: 99%

Ceramic tiles as sustainable, functional and insulating materials to mitigate fire damage

Naser

Thavarajah²

2021

Advances in Applied Ceramics

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“…[54,[75][76][77][78][79][80] The lanthanide cerates have thermal conductivities in the upper range of those of YSZ and higher than those of the lanthanide zirconates, [75,76] but can be decreased with doping (e.g., (Sm 1Àx Dy x ) 2 Ce 2 O 7 ). [76] The thermal conductivity of La 2 Hf 2 O 7 , however, is lower than that of La 2 Zr 2 O 7 , which has been attributed to reduction in the phonon velocity due to the lower elastic modulus of La 2 Hf 2 O 7 .…”

Section: Thermal Conductivitymentioning

confidence: 99%

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Fergus

2014

Metallurgical and Materials Transactions E

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One of the important applications of yttria-stabilized zirconia (YSZ) is as a thermal barrier coating for gas turbine engines. While YSZ performs well in this function, the need for increased operating temperatures to achieve higher energy conversion efficiencies, requires the development of improved materials. To meet this challenge, some rare-earth zirconates that form the cubic fluorite-derived pyrochlore structure are being developed for use in thermal barrier coatings due to their low thermal conductivity, excellent chemical stability, and other suitable properties. In this paper, the thermal conductivities of current and prospective oxides for use in thermal barrier coatings are reviewed. The factors affecting the variations and differences in the thermal conductivities and the degradation behaviors of these materials are discussed.

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“…The thermal conductivities of pyrochlore type lanthanide zirconate L 2 Zr 2 O 7 (where L is La, Nd, Sm, Eu, Er, Gd, Dy, Yb, etc.) ceramic are much lower than that of YSZ (1.1‐1.6 W/m K) . Because of their appealing thermophysical properties, L 2 Zr 2 O 7 type ceramics had been investigated for advance TBC applications.…”

Section: Introductionmentioning

confidence: 99%

“…The substitution of the cerium (Ce +4 ) at the position of Zr +4 has reported to increase the TEC. Many cerates have been researched for their high temperature thermophysical properties such as La 2 Ce 2 O 7 , Er 2 Ce 2 O 7 , Yb 2 Ce 2 O 7 , Gd 2 Ce 2 O 7 , Y 2 Ce 2 O 7 , and Dy 2 Ce 2 O 7 …”

Section: Introductionmentioning

confidence: 99%

Sulfate‐vanadate hot corrosion of neodymium cerate/yttria stabilized zirconia composite coating

Ejaz

Ali

Ahmed

et al. 2018

Int J Applied Ceramic Tech

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Neodymium cerate (Nd2Ce2O7) was laboratory synthesized by solid‐state reactions of neodymia and ceria and spray dried to get the feedstock for plasma spraying. Hot corrosion behavior of air plasma sprayed 10% Nd2Ce2O7/yttria stabilized zirconia (YSZ) topcoat was studied in the presence of V2O5 and Na2SO4 salts at 950°C for 10‐60 hours. It was observed that due to the presence of relatively higher basic compounds Nd2O3 and CeO2 (form Nd2Ce2O7) than Y2O3 in YSZ changed the reaction dynamics during hot corrosion and the major part of corrosive (NaVO3) was consumed by Nd of Nd2Ce2O7, making NdVO4. The Y2O3 of YSZ contributed in the corrosive reaction partially, relieving majority tetragonal zirconia (t‐ZrO2) in topcoat (YSZ). No remarkable cracking was developed in the topcoat even after 60 hours of accelerated hot corrosion, which was attributed to the retention of in‐relief t‐ZrO2 in YSZ.

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Investigation about thermophysical properties of Ln2Ce2O7 (Ln=Sm, Er and Yb) oxides for thermal barrier coatings

Cited by 49 publications

References 33 publications

Ceramic tiles as sustainable, functional and insulating materials to mitigate fire damage

Ceramic tiles as sustainable, functional and insulating materials to mitigate fire damage

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Sulfate‐vanadate hot corrosion of neodymium cerate/yttria stabilized zirconia composite coating

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