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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1198-1204

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1198 - 1204 Next article>>

Evaluation of Delamination Life of 8mass%Y2O3·ZrO2/NiCoCrAlY Thermal Barrier Coating under Creep Deformation

Masahiko KATO1), Keijiro NAKASA1), Baohua ZHAO2) and Gou TANIGUCHI2)
1) Maj. of Mech. Sys. Eng., Hiroshima Univ.
2) Hiroshima Univ.


Thermal barrier coating (TBC) was applied to Ni based superalloy specimens, where bond coat was NiCoCrAlY deposited by high velocity oxygen fuel (HVOF) spraying and top coat was 8mass% yittria stabilized zirconia (YSZ) by atmospheric plasma spraying. The creep tests of the specimens were carried out at 1273K, 1373K and 1423K by three-point bending until the delamination of coating. The results showed that the creep strain increased with increasing loading time and heating temperature, and the strain at delamination decreased both with increasing delamination time and decreasing temperature. An equation to evaluate the delamination life of TBC was introduced by combining the damage of interface due to heat cycle, holding time and creep deformation using the strain parallel to interface. The predicted delamination life coincided relatively well with experimental one.


Keyword:
Thermal barrier coating, Creep strain, High temperature, Oxide layer, Delamination, Life prediction

Received: April 07, 2008
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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