Journal Article

PreJuSER-843

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Yb203 and Gd203 doped strontium zirconate for thermal barrier coatings

Ma, W.FZJ* ; Mack, D.FZJ* ; Malzbender, J.FZJ* ; Vaßen, R.FZJ* ; Stöver, D.FZJ*

2008
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2008.05.013

Abstract: Yb2O3 (10 mol%) and Gd2O3 (20 mol%) doped SrZrO3 was investigated as a material for thermal barrier coating (TBC) applications. The thermal expansion coefficients (TECs) of sintered bulk Sr(Zr0.8Yb0.1)O-2.95 and Sr(Zr0.8Gd0.2)O-2.9 were recorded by a high-temperature dilatometer and revealed a positive influence on phase transformations of SrZrO3 by doping Yb2O3 or Gd2O3. The results for the thermal conductivities of Sr(Zr0.9Yb0.1)O-2.95 and Sr(Zr0.8Gd0.2)O-2.9 indicated that both dopants can reduce the thermal conductivity of SrZrO3. Mechanical properties (Young's modulus, hardness, and fracture toughness) of dense Sr(Zr0.9Yb0.1)O-2.95 and Sr(Zr(0.8)d(0.2))O-2.9 showed lower Young's modulus, hardness and comparable fracture toughness with respect to YSZ. The cycling lifetimes of Sr(Zr0.9Yb0.1)O-2.95/YSZ and Sr(Zr0.8Gd0.2)O-2.9/YSZ double layer coatings (DLC), which were prepared by plasma spraying, were comparable to that of YSZ at operating temperatures <1300 degrees C. However, the cycling lifetime of Sr(Zr0.9Yb0.1)O-2.95/YSZ DLC was similar to 25% longer, whereas Sr(Zr0.8Gd0.2)O-2.9/YSZ DLC had a shorter lifetime compared to the optimized YSZ coating at operating temperatures >1300 degrees C. (c) 2008 Elsevier Ltd. All rights reserved.

Keyword(s): J ; Thermal barrier coatings (auto) ; Perovskites (auto) ; Thermal properties (auto) ; Lifetime (auto) ; SrZrO3 (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEF-1)
2. Werkstoffstruktur und Eigenschaften (IEF-2)
3. Jülich-Aachen Research Alliance - Energy (JARA-ENERGY)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2008

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