期刊
MATERIALS
卷 6, 期 8, 页码 3387-3403出版社
MDPI
DOI: 10.3390/ma6083387
关键词
thermal barrier coating; bond coat; air-plasma spray; thermal durability; cyclic thermal exposure; thermal-shock
类别
资金
- National Research Foundation of Korea (NRF)
- Korean Government (MEST) [2012-0009452]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20134030200220, 2011T100200224]
- Korea government Ministry of Trade, Industry and Energy
- Korea Evaluation Institute of Industrial Technology (KEIT) [20134030200220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0030058] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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