Study on Performance of 8YSZ Thick Gradient TBC

Jin Qin; Gang Chen; Zhi Ming Du; Yu Hui Jin

doi:10.4028/www.scientific.net/AMM.607.43

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 607Study on Performance of 8YSZ Thick Gradient TBC

Study on Performance of 8YSZ Thick Gradient TBC

Abstract:

Plasma spray zirconia gradient thermal barrier coating (TBC) and the traditional double-layer structure thermal barrier coating were both studied in this paper. NiCoCrAlY alloy powder was used as bottom bonding materials, 8YSZ (8mol% yttrium stabilized zirconia) was used as top layer materials and the different proportions mixed powder of 8YSZ and NiCoCrAlY was used as gradient layers materials. Bonding strength of thickness gradient coating was measured by tensile experiment. Thermal cycle experiment was carried on to test the thermal shock resistance of TBC. The microstructure after thermal shock experiment was observed to analyze the failure mechanism of TBC. The research result shows that the bonding strength and thermal shock resistance of gradient TBC are much better than the traditional double-layer structure TBC. With the increasing of top layer thickness, thermal shock life of TBC substantially reduces. With the decreasing of ZrO₂ composition proportion in gradient layer, thermal shock life of TBC significantly rises. This result has important significance for the future study of thick TBC.

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Periodical:

Applied Mechanics and Materials (Volume 607)

Pages:

43-46

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.607.43

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Online since:

July 2014

Authors:

Jin Qin, Gang Chen, Zhi Ming Du*, Yu Hui Jin

Keywords:

Bonding Strength, Plasma Spraying, TBC, Thermal Cycle

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