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Materials 2013, 6(8), 3387-3403; doi:10.3390/ma6083387
Article

Thermal Fatigue Behavior of Air-Plasma Sprayed Thermal Barrier Coating with Bond Coat Species in Cyclic Thermal Exposure

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Received: 26 June 2013; in revised form: 30 July 2013 / Accepted: 1 August 2013 / Published: 8 August 2013
(This article belongs to the Special Issue Advances in Surface Coatings 2013)
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Abstract: The effects of the bond coat species on the delamination or fracture behavior in thermal barrier coatings (TBCs) was investigated using the yclic thermal fatigue and thermal-shock tests. The interface microstructures of each TBC showed a good condition without cracking or delamination after flame thermal fatigue (FTF) for 1429 cycles. The TBC with the bond coat prepared by the air-plasma spray (APS) method showed a good condition at the interface between the top and bond coats after cyclic furnace thermal fatigue (CFTF) for 1429 cycles, whereas the TBCs with the bond coats prepared by the high-velocity oxygen fuel (HVOF) and low-pressure plasma spray (LPPS) methods showed a partial cracking (and/or delamination) and a delamination after 780 cycles, respectively. The TBCs with the bond coats prepared by the APS, HVOF and LPPS methods were fully delaminated (>50%) after 159, 36, and 46 cycles, respectively, during the thermal-shock tests. The TGO thickness in the TBCs was strongly dependent on the both exposure time and temperature difference tested. The hardness values were found to be increased only after the CFTF, and the TBC with the bond coat prepared by the APS showed the highest adhesive strength before and after the FTF.
Keywords: thermal barrier coating; bond coat; air-plasma spray; thermal durability; cyclic thermal exposure; thermal-shock thermal barrier coating; bond coat; air-plasma spray; thermal durability; cyclic thermal exposure; thermal-shock
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Lu, Z.; Myoung, S.-W.; Jung, Y.-G.; Balakrishnan, G.; Lee, J.; Paik, U. Thermal Fatigue Behavior of Air-Plasma Sprayed Thermal Barrier Coating with Bond Coat Species in Cyclic Thermal Exposure. Materials 2013, 6, 3387-3403.

AMA Style

Lu Z, Myoung S-W, Jung Y-G, Balakrishnan G, Lee J, Paik U. Thermal Fatigue Behavior of Air-Plasma Sprayed Thermal Barrier Coating with Bond Coat Species in Cyclic Thermal Exposure. Materials. 2013; 6(8):3387-3403.

Chicago/Turabian Style

Lu, Zhe; Myoung, Sang-Won; Jung, Yeon-Gil; Balakrishnan, Govindasamy; Lee, Jeongseung; Paik, Ungyu. 2013. "Thermal Fatigue Behavior of Air-Plasma Sprayed Thermal Barrier Coating with Bond Coat Species in Cyclic Thermal Exposure." Materials 6, no. 8: 3387-3403.


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