氧化铝封孔对大气等离子喷涂热障涂层抗高温氧化性能的影响  

Effect of Al_(2)O_(3)Sealing on High Temperature Oxidation Resistance of Thermal Barrier Coating by Atmospheric Plasma Spraying

作　　者：安国升[1] 周兰 钟云 臧树俊[1] 吴潇萧 冯力[1] AN Guosheng;ZHOU Lan;ZHONG Yun;ZANG Shujun;WU Xiaoxiao;FENG Li(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Mechatronics Engineering,Lanzhou University of Technology,Lanzhou 730050,China;China National Nuclear Industry Corporation 404,Jiayuguan 732850,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学机电工程学院,兰州730050 [3]中核404有限公司,甘肃嘉峪关732850

出　　处：《有色金属工程》2023年第12期10-17,共8页Nonferrous Metals Engineering

基　　金：甘肃省青年博士基金项目(2021QB-043);中核核电运营(QS4FY-22003224)。

摘　　要：为减少氧气在大气等离子喷涂热障涂层(TBC)中的渗透通道,进而提高涂层抗高温氧化性能,采用溶胶凝胶法制备Al_(2)O_(3)封孔剂,通过1100℃高温氧化试验,研究封孔作用对陶瓷层中氧气传输、TBC微观形貌以及热生长氧化物(TGO)生长行为的影响规律,阐明封孔对提高TBC抗高温氧化性能的作用机理。结果表明:Al_(2)O_(3)封孔有效阻碍了陶瓷层氧气的渗透,降低了TBC的氧化速率。直至氧化100 h,通过封孔的TBC始终具有更小的TGO厚度与氧化增重,且抛物线氧化速率(K_(p))相比传统TBC下降了14.99%。In order to reduce oxygen permeation channels in thermal barrier coating(TBC),producing by atmospheric plasma spraying,and further improving high temperature oxidation resistance of TBC.Isothermal oxidation tests were carried out at 1100℃to investigate the affect rules of Al_(2)O_(3)sealing agent prepared via sol-gel method on oxygen transport in ceramic layer,TBC microstructure and growth behaviors of thermally grown oxide(TGO),and clarify the mechanism of sealing effect on improving the TBC high-temperature oxidation resistance.Results show that the TBC oxygen rates were decreased since oxygen permeation in ceramic coating was retard by Al_(2)O_(3)sealing agent.the TBC after sealing always has smaller TGO thickness and oxygen weight gain,compared with conventional TBC,the parabolic oxygen rate(K_(p))of the TBC after sealing was decreased by 14.99%until to oxygen for 100 h.

关 键 词：热障涂层 氧化铝 封孔 热生长氧化物 

分 类 号：TG174.4[金属学及工艺—金属表面处理]