Preparation and Characterization of 8YSZ Thermal Barrier Coatings on Rare Earth-Magnesium Alloy

The zirconates of rare earth elements, such as Sm2Zr2O7, can be an alternative material for zirconia modified by yttria (8YSZ) usually used as an insulation layer in thermal barrier coatings (TBC) systems. This chapter describes the morphology of feedstock zirconate powder, internal morphology and selected properties of different samarium zirconate TBC systems. These included: composite TBC coatings of Sm2Zr2O7 + 8YSZ type with different ratio of both used to coatings deposition powders (25/75, 50/50 and 75/25) as well as the TBC of double ceramic layer (DCL) type with an 8YSZ internal layer and an outer layer of Sm2Zr2O7 type, and a monolayer TBC based on Sm2Zr2O7. Another presented subject is related to the oxidation resistance of TBC systems during static oxidation test at temperature 1100°C. In this case, the special emphasis was taken on the characterization of thermally grown oxides (TGO) zone thickness where the most important phenomena related with overall live-time of TBC systems usually take place.

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Fabrication and Characterization of Ceramics and Thermal Barrier Coatings of Lanthanum Zirconate with Reduced Rare-earth Contents in the La2O3-ZrO2 System

Journal of Korean Powder Metallurgy Institute ◽

10.4150/kpmi.2015.22.6.413 ◽

2015 ◽

Vol 22 (6) ◽

pp. 413-419 ◽

Cited By ~ 1

Author(s):

Chang-Sup Kwon ◽

◽

Sujin Lee ◽

Sung-Min Lee ◽

Yoon-Suk Oh ◽

...

Keyword(s):

Rare Earth ◽

Thermal Barrier Coatings ◽

Thermal Barrier ◽

Lanthanum Zirconate ◽

Barrier Coatings ◽

Fabrication And Characterization ◽

Zro2 System

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Defect Clustering and Nano-Phase Structure Characterization of Multi-Component Rare Earth Oxide Doped Zirconia-Yttria Thermal Barrier Coatings

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3 - Ceramic Engineering and Science Proceedings ◽

10.1002/9780470294802.ch75 ◽

2008 ◽

pp. 525-534 ◽

Cited By ~ 27

Author(s):

Dongming Zhu ◽

Yuan L. Chen ◽

Robert A. Miller

Keyword(s):

Rare Earth ◽

Thermal Barrier Coatings ◽

Phase Structure ◽

Rare Earth Oxide ◽

Structure Characterization ◽

Thermal Barrier ◽

Barrier Coatings

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Characterization of thermal barrier coatings with a gradient in porosity

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2004.07.094 ◽

2005 ◽

Vol 195 (2-3) ◽

pp. 245-251 ◽

Cited By ~ 75

Author(s):

A. Portinha ◽

V. Teixeira ◽

J. Carneiro ◽

J. Martins ◽

M.F. Costa ◽

...

Keyword(s):

Thermal Barrier Coatings ◽

Thermal Barrier ◽

Barrier Coatings

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Design, Preparation and Thermal Properties of (La0.4Sm0.5Yb0.1)2Zr2O7 Ceramic for Thermal Barrier Coatings

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.469 ◽

2012 ◽

Vol 512-515 ◽

pp. 469-473 ◽

Cited By ~ 1

Author(s):

L. Liu ◽

Z. Ma ◽

F.C. Wang ◽

Q. Xu

Keyword(s):

Thermal Conductivity ◽

Thermal Expansion ◽

Thermal Properties ◽

Rare Earth ◽

Thermal Expansion Coefficient ◽

Thermal Barrier Coatings ◽

Expansion Coefficient ◽

Phonon Transport ◽

Thermal Barrier ◽

Barrier Coatings

According to the theory of phonon transport and thermal expansion, a new complex rare-earth zirconate ceramic (La0.4Sm0.5Yb0.1)2Zr2O7, with low thermal conductivity and high thermal expansion coefficient, has been designed by doping proper ions at A sites. The complex rare-earth zirconate (La0.4Sm0.5Yb0.1)2Zr2O7 powder for thermal barrier coatings (TBCs) was synthesized by coprecipitation-calcination method. The phase, microstructure and thermal properties of the new material were investigated. The results revealed that single phase (La0.4Sm0.5Yb0.1)2Zr2O7 with pyrochlore structure was synthesized. The thermal conductivity and the thermal expansion coefficient of the designed complex rare-earth zirconate ceramic is about 1.3W/m•K and 10.5×10-6/K, respectively. These results imply that (La0.4Sm0.5Yb0.1)2Zr2O7 can be explored as the candidate material for the ceramic layer in TBCs system.

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