Lu Zhe, Myoung Sang-Won, Jung Yeon-Gil, Balakrishnan Govindasamy, Lee Jeongseung, Paik Ungyu
School of Nano & Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea.
School of Mechatronics, Changwon National University, #9 Sarim-dong, Changwon, Gyeongnam 641-773, Korea.
Materials (Basel). 2013 Aug 8;6(8):3387-3403. doi: 10.3390/ma6083387.
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.
采用循环热疲劳和热冲击试验研究了粘结层种类对热障涂层（TBCs）分层或断裂行为的影响。在进行1429次火焰热疲劳（FTF）后，各TBC的界面微观结构状况良好，无裂纹或分层现象。采用大气等离子喷涂（APS）方法制备粘结层的TBC在进行1429次循环炉热疲劳（CFTF）后，顶层与粘结层之间的界面状况良好，而采用高速氧燃料（HVOF）和低压等离子喷涂（LPPS）方法制备粘结层的TBC分别在780次循环后出现部分开裂（和/或分层）和分层现象。在热冲击试验中，采用APS、HVOF和LPPS方法制备粘结层的TBC分别在159、36和46次循环后完全分层（>50%）。TBCs中的热生长氧化物（TGO）厚度强烈依赖于测试的暴露时间和温差。硬度值仅在CFTF后有所增加，并且采用APS方法制备粘结层的TBC在FTF前后表现出最高的粘结强度。
