Preparation and thermophysical properties of (Sm1−xErx)2Ce2O7 oxides for thermal barrier coatings

Chen, Xiaoge; Shusen, Yang; Zhang, Hongsong; Li, Gang; Li, Zhenjun; Ren, Bo; Dang, Xudan; Zhang, Haoming; Tang, An

doi:10.1016/j.materresbull.2013.12.011

Cited by 18 publications

(2 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ion radius of Dy 3+ ions and Yb 3+ ions is 0.091 nm and 0.086 nm, respectively, according to the following Equation (1): 7…”

Section: Resultsmentioning

confidence: 99%

Effects of Dy3+-doping on the thermophysical properties of Ba2YbAlO5 ceramics

Liu¹,

Zheng²,

Zhang³

et al. 2018

Mater. Tehnol.

View full text Add to dashboard Cite

Ba2(DyxYb1-x)AlO5 ceramics were prepared by solid-state sintering in air for 10 h at 1560°C.The influence of Dy 3+ doping on the thermal physical properties of Ba2YbAlO5 was studied. The phase structure of these ceramics were identified by X-ray diffraction, which indicates that all of these ceramics have a perovskite structure. The thermal physical properties of these ceramics measurement show that the thermal expansion coefficient of them by Dy 3+ doped significantly increased, and the maximum value of about 12.2 × 10-6 K-1 was reached at x = 0.3. The thermal conductivity of Ba2(DyxYb1-x)AlO5 decreased firstly and then increased with the increasing of x. For samples with the same compound point x = 0.2, the minimum value (0.998 W•m-1 •K-1) was realized. The excellent thermal physical properties mean that these solid solutions are potential materials for ceramic layers in thermal barrier coatings. Keywords: perovskite-like ceramics, thermal expansion coefficient, thermal conductivity, thermal barrier coatings Avtorji prispevka so pripravili Ba2(DyxYb1-x)AlO5 keramiko s postopkom sintranja v trdnem stanju in raziskovali vpliv razli~ne koli~ine dodatka Dy 3+ na njene termofizikalne lastnosti. Sintranje je potekalo na zraku 10 ur pri 1560°C. Fazno strukturo te keramike so identificirali z rentgensko difrakcijo. Ta je pokazala, da ima keramika perovskitno strukturo. Meritve termofizikalnih lastnosti te keramike so pokazale, da toplotni razteznostni koeficient z dodatkom Dy 3+ znatno naraste in dose`e maksimalno vrednost okoli 12,2 × 10-6 K-1 pri x = 0,3. Toplotna prevodnost Ba2(DyxYb1-x)AlO5 najprej pada in nato nara{~a z dodatkom Dy 3+. Tako je naprimer pri vzorcih z enako sestavo in x = 0,2 dose`ena minimalna vrednost 0,998 W•m-1 •K-1. Odli~ne termofizikalne lastnosti pomenijo, da so te trdne raztopine materiali, potencialno uporabni kot termi~ne pregrade v kerami~nih prevlekah.

show abstract

“…The ion radius of Dy 3+ ions and Yb 3+ ions is 0.091 nm and 0.086 nm, respectively, according to the following Equation (1): 7…”

Section: Resultsmentioning

confidence: 99%

Effects of Dy3+-doping on the thermophysical properties of Ba2YbAlO5 ceramics

Liu¹,

Zheng²,

Zhang³

et al. 2018

Mater. Tehnol.

View full text Add to dashboard Cite

show abstract

“…The major disadvantages of YSZ are phase changes, accelerated sintering, severe hot corrosion etc. which leads to a premature failure of TBC [6,8]. The demand for advanced TBC materials that can operate at elevated temperature at least 1400°C is very high.…”

Section: Introductionmentioning

confidence: 99%

Isothermal aging characteristics of rare earth magnesium hexaaluminate based advanced thermal barrier coatings

Jana¹,

Jayan²,

Mandal³

et al. 2018

Adv. Mater. Lett.

View full text Add to dashboard Cite

The isothermal aging characteristics of rare earth magnesium hexaaluminate (REMHA) based thermal barrier coatings (TBC) such as lanthanum magnesium hexaaluminates (LMHA), Neodymium doped LMHA (LNMHA) and LNMHA-Yttrium aluminium garnet (YAG) composite were evaluated at 1400°C and compared with standard yttria stabilized zirconia (YSZ) coating. The platelet structure of hexaaluminate forms meso-porous structure and provides superior sintering resistance than YSZ coating. Faster grain growth kinetics is observed in YSZ coating as compared to hexaaluminate-based coatings. As a result, the mechanical properties of YSZ coating deteriorate severely whereas hexaaluminate based coating remains almost unaltered. The LNMHA coating is found to be the best sintering resistance among them. LNMHA and LNMHA-YAG composite have potential to meet the requirement of advanced TBC operating even at 1400°C.

show abstract

Thermal Conductivities and Thermal Expansion Coefficients of (Sm0.5Gd0.5)2(Ce1−x Zr x )2O7 Ceramics

Zhang

Shi

Yongde

et al. 2015

J. of Materi Eng and Perform

Self Cite

View full text Add to dashboard Cite

The (Sm 0.5 Gd 0.5 ) 2 (Ce 12x Zr x ) 2 O 7 oxides were prepared by solid-state reaction, and their phase compositions, microstructures, and thermophysical properties were investigated. Results of x-ray diffraction reveal that pure (Sm 0.5 Gd 0.5 ) 2 (Ce 12x Zr x ) 2 O 7 oxides with fluorite structure are successfully synthesized in the current study. The thermal expansion coefficient decreases with increasing content of ZrO 2 , which is higher than that of 7 wt.% yttria-stabilized zirconia (YSZ). The substitution of Zr 4+ for Ce 4+ reduces the thermal conductivity of Sm 2 Ce 2 O 7 oxide. The thermal conductivity decreases from 1.69 W/m K (x = 0) to 1.22 W/ m K (x = 0.3) at 1000°C. The composition with x = 0.3 exhibits the lowest thermal conductivity at all temperatures, and the thermal conductivity of (Sm 0.5 Gd 0.5 ) 2 (Ce 12x Zr x ) 2 O 7 ceramics was obviously lower than those of fully dense 7 wt.% YSZ. These results suggested promising potential applications of the (Sm 0.5 Gd 0.5 ) 2 (Ce 12x Zr x ) 2 O 7 ceramics for high-temperature thermal barrier coatings.

show abstract

Preparation and thermophysical properties of (Sm1−xErx)2Ce2O7 oxides for thermal barrier coatings

Cited by 18 publications

References 34 publications

Effects of Dy3+-doping on the thermophysical properties of Ba2YbAlO5 ceramics

Effects of Dy3+-doping on the thermophysical properties of Ba2YbAlO5 ceramics

Isothermal aging characteristics of rare earth magnesium hexaaluminate based advanced thermal barrier coatings

Thermal Conductivities and Thermal Expansion Coefficients of (Sm0.5Gd0.5)2(Ce1−x Zr x )2O7 Ceramics

Contact Info

Product

Resources

About