真空等离子喷涂NiCoCrAlYTa涂层在1050℃的氧化行为研究  

Oxidation Behavior of Vacuum Plasma Sprayed NiCoCrAlYTa Coating at 1050℃

作　　者：王天颖 王长亮 苗小锋 聂梓杏 任佳奇 崔永静 刘鑫 WANG Tian-ying;WANG Chang-liang;MIAO Xiao-feng;NIE Zi-xing;REN Jia-qi;CUI Yong-jing;LIU Xin(Key Laboratory of Advanced Corrosion and Protection for Aviation Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;AECC South Industry Co.,Ltd.,Hunan Zhuzhou 412002,China;Zhongxin Kexin Beijing Invest Consulting Co.,Ltd.,Beijing 102407,China)

机构地区：[1]中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京100095 [2]中国航发南方工业有限公司,湖南株洲412002 [3]中信科信(北京)投资咨询有限公司,北京102407

出　　处：《失效分析与预防》2023年第4期222-227,共6页Failure Analysis and Prevention

基　　金：国家科技重大专项(J2019-Ⅶ-0007-0147)

摘　　要：采用真空等离子喷涂(VPS)方法在DD6单晶合金基体表面制备NiCoCrAlYTa涂层,研究DD6基体和DD6/NiCoCrAlYTa涂层在1050℃的高温氧化行为,通过X射线衍射和扫描电镜研究涂层相结构和微观形貌变化。结果表明:NiCoCrAlYTa涂层氧化动力学曲线符合抛物线规律;氧化分为快速氧化和慢速氧化2个阶段,快速氧化阶段的氧化速率常数为0.00652 mg^(2)•cm^(−4)•h^(−1),慢速氧化阶段的氧化速率常数为0.00274 mg^(2)•cm^(−4)•h^(−1);在慢速氧化阶段形成较完整的氧化物防护层,有效降低涂层和基体的进一步氧化速率,其200 h氧化增重为0.9 mg/cm^(2),相较于DD6基体的氧化增重2.16 mg/cm^(2)有显著降低。采用VPS方法在DD6基体制备的NiCoCrAlYTa涂层在1050℃以下具有优异的抗氧化效果。NiCoCrAlYTa coating was prepared on DD6 single crystal alloy substrate by the vacuum plasma spraying(VPS)method.The oxidation behavior of DD6 substrate and DD6/NiCoCrAlYTa coating at 1050℃was studied.The phase microstructure and microscopic morphology of the coating were studied by XRD and SEM.The results show that the oxidation kinetics curve of NiCoCrAlYTa coating conforms to the parabolic law,and the oxidation can be divided into two stages:fast oxidation and slow oxidation.The oxidation rate constant K of the fast oxidation stage is 0.00652 mg^(2)•cm^(−4)•h^(−1),and the oxidation rate constant of the slow oxidation stage is 0.00274 mg^(2)•cm^(−4)•h^(−1).In the slow oxidation stage,a relatively complete oxide protective layer was formed,which effectively reduces the further oxidation rate of the coating and substrate.The 200 h oxidation weight gain is 0.9 mg/cm^(2),which is significantly lower than that of DD6 substrate which is 2.16 mg/cm^(2).Therefore,NiCoCrAlYTa coating prepared by the VPS method has excellent oxidation resistance for the DD6 substrate below 1050℃.

关 键 词：真空等离子喷涂 NICOCRALYTA涂层 抗氧化性能 氧化速率 

分 类 号：TG174.4[金属学及工艺—金属表面处理]