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.
| Original language | English |
|---|---|
| Pages (from-to) | 3387-3403 |
| Number of pages | 17 |
| Journal | Materials |
| Volume | 6 |
| Issue number | 8 |
| DOIs | |
| State | Published - 2013 Sep 25 |
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Keywords
- Air-plasma spray
- Bond coat
- Cyclic thermal exposure
- Thermal barrier coating
- Thermal durability
- Thermal-shock
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Thermal fatigue behavior of air-plasma sprayed thermal barrier coating with bond coat species in cyclic thermal exposure. / Lu, Zhe; Myoung, Sang Won; Jung, Yeon Gil; Balakrishnan, Govindasamy; Lee, Jeongseung; Paik, Ungyu.
In: Materials, Vol. 6, No. 8, 25.09.2013, p. 3387-3403.Research output: Contribution to journal › Article
TY - JOUR
T1 - Thermal fatigue behavior of air-plasma sprayed thermal barrier coating with bond coat species in cyclic thermal exposure
AU - Lu, Zhe
AU - Myoung, Sang Won
AU - Jung, Yeon Gil
AU - Balakrishnan, Govindasamy
AU - Lee, Jeongseung
AU - Paik, Ungyu
PY - 2013/9/25
Y1 - 2013/9/25
N2 - 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.
AB - 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.
KW - Air-plasma spray
KW - Bond coat
KW - Cyclic thermal exposure
KW - Thermal barrier coating
KW - Thermal durability
KW - Thermal-shock
UR - http://www.scopus.com/inward/record.url?scp=84884361761&partnerID=8YFLogxK
U2 - 10.3390/ma6083387
DO - 10.3390/ma6083387
M3 - Article
AN - SCOPUS:84884361761
VL - 6
SP - 3387
EP - 3403
JO - Materials
JF - Materials
SN - 1996-1944
IS - 8
ER -