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

Materials

Zhe Lu²  Sang-Won Myoung²  Yeon-Gil Jung²  Govindasamy Balakrishnan¹  Jeongseung Lee³ 

[1] School of Mechatronics, Changwon National University, #9 Sarim-dong, Changwon, Gyeongnam 641-773, Korea; E-Mail:;School of Nano & Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea; E-Mails:;Materials Engineering Group, Energy Equipment R&D Center, Samsumg Techwin Co. Ltd., Seongnam, Gyeonggi 463-400, Korea; E-Mail:

关键词: thermal barrier coating;    bond coat;    air-plasma spray;    thermal durability;    cyclic thermal exposure;    thermal-shock;   

DOI  :  10.3390/ma6083387

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.