Thermal barrier coating of lanthanum–zirconium–cerium composite oxide made by electron beam-physical vapor deposition

Xu, Zhenhua; He, Limin; Zhong, Xinghua; Mu, Rende; He, Shi; Cao, Xia

doi:10.1016/j.jallcom.2008.11.073

Cited by 59 publications

(31 citation statements)

References 21 publications

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“…At issue are the aging effects on the phase stability of YSZ at temperatures above 1200°C ( Ref 5,6), as well as on the desirable reductions in the thermal conductivity. Among TBC candidates, lanthanum zirconate (La 2 Zr 2 O 7 , or LZ) is regarded as one of potential alternative materials because of its low thermal conductivity, stable phase structure, and good sintering resistance ( Ref 7,8).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Thermophysical Properties of La2Zr2O7 Coatings by Thermal Spraying of an Amorphous Precursor

et al. 2011

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Free-standing La 2 Zr 2 O 7 coatings were obtained by plasma spraying, using an amorphous La-O-Zr precursor as the feedstock. The La-O-Zr precursor powder was prepared by coprecipitation. During thermal spraying, the formation of coatings can be regarded as a joint process of melting-solidification, thermal decomposition, and crystallization. The time required for crystal growth was significantly shortened during spraying. Consequently, the average grain size of coatings was approximately 200 nm, with a narrow distribution (100-500 nm). Coatings prepared by this method show better thermophysical properties than those prepared with crystalline La 2 Zr 2 O 7 powder as the feedstock. The thermal conductivity of the as-sprayed coating was approximately 0.36-0.47 W/m K and the average coefficient of thermal expansion (CTE) is 11.1 3 10 26 /K.

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Section: Introductionmentioning

confidence: 99%

Preparation and Thermophysical Properties of La2Zr2O7 Coatings by Thermal Spraying of an Amorphous Precursor

et al. 2011

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“…However, a major disadvantage of YSZ is its limited operation temperature (1200 • C) for long-term application [8]. Recently, lanthanum zirconate (LZ), a novel candidate for next generation TBC ceramic materials, has attracted much interest due to its low thermal conductivity, high melting point (2280 • C), high sintering-resistance and phase stability [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Coprecipitation synthesis and thermal conductivity of La2Zr2O7

Chen

Gao

Liu

et al. 2009

Journal of Alloys and Compounds

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“…11-Thermal conductivity of mixed lanthanide perovskites. [55,66] 124-VOLUME 1A, JUNE 2014doped with cerium on the zirconium site alone [49][50][51]72,73] or as a co-dopant with ytterbium, [48] samarium, [65] or dysprosium + neodymium [51] on the lanthanide site to decrease the thermal conductivity. However, cerium additions to Sm 2 Zr 2 O 7 have been shown to lead to an increase in thermal conductivity.…”

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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Thermal barrier coating of lanthanum–zirconium–cerium composite oxide made by electron beam-physical vapor deposition

Cited by 59 publications

References 21 publications

Preparation and Thermophysical Properties of La2Zr2O7 Coatings by Thermal Spraying of an Amorphous Precursor

Preparation and Thermophysical Properties of La2Zr2O7 Coatings by Thermal Spraying of an Amorphous Precursor

Coprecipitation synthesis and thermal conductivity of La2Zr2O7

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

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