Effects of pellet surface roughness and pre-oxidation temperature on CMAS corrosion behavior of Ti_(2)AlC  

作　　者：Lei GUO Guang LI Jing WU Xiaohui WANG 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [2]Tianjin Key Laboratory of Advanced Joining Technology,Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin 300072,China [3]School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China [4]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

出　　处：《Journal of Advanced Ceramics》2022年第6期945-960,共16页先进陶瓷（英文）

基　　金：This research is sponsored by the National Natural Science Foundation of China(Grant No.51971156).

摘　　要：Calcium–magnesium–alumina–silicate(CMAS)corrosion is a serious threat to thermal barrier coatings(TBCs).Ti_(2)AlC has been proven to be a potential protection layer material for TBCs to resist CMAS corrosion.In this study,the effects of the pellet surface roughness and temperature on the microstructure of the pre-oxidation layer and CMAS corrosion behavior of Ti_(2)AlC were investigated.The results revealed that pre-oxidation produced inner Al_(2)O_(3)layer and outer TiO_(2)clusters on the pellet surfaces.The content of TiO_(2)decreased with decreasing pellet surface roughness and increased along with the pre-oxidation temperature.The thickness of Al_(2)O_(3)layer is also positively related to the pre-oxidation temperature.The Ti_(2)AlC pellets pre-oxidized at 1050℃could effectively resist CMAS corrosion by promoting the crystallization of anorthite(CaAl_(2)Si_(2)O_(8))from the CMAS melt rapidly,and the resistance effectiveness increased with the pellet surface roughness.Additionally,the CMAS layer mainly spalled off at the interface of CaAl_(2)Si_(2)O_(8)/Al_(2)O_(3)layer after thermal cycling tests coupled with CMAS corrosion.The Al_(2)O_(3)layer grown on the rough interface could combine with the pellets tightly during thermal cycling tests,which was attributed to obstruction of the rough interface to crack propagation.

关 键 词：thermal barrier coatings(TBCs) TI2ALC surface roughness pre-oxidation temperature calcium-magnesium-alumina-silicate(CMAS)corrosion thermal cycling 

分 类 号：TQ174[化学工程—陶瓷工业]