强流脉冲电子束辐照对低压等离子喷涂 MCrAlY涂层组织与性能的影响  

Effect of High-Current Pulsed Electron Beam Irradiation on Microstructure and Properties of MCrAlY Coating Prepared by Low-Pressure Plasma Spraying

作　　者：蔡杰[1,2] 高杰 花银群[2] 叶云霞[2] 关庆丰[3] 张小锋[4] CAI Jie;GAO Jie;HUA Yinqun;YE Yunxia;GUAN Qingfeng;ZHANG Xiaofeng(Institute of Advanced Manufacturing and Modern Equipment Technology,Jiangsu University,Zhenjiang 212013,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;Institute of New Materials,Guangdong Academy of Science,Guangzhou 510650,China)

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,镇江212013 [2]江苏大学机械工程学院,镇江212013 [3]江苏大学材料科学与工程学院,镇江212013 [4]广东省科学院新材料研究所,广州510650

出　　处：《金属学报》2024年第4期495-508,共14页Acta Metallurgica Sinica

基　　金：国家自然科学基金联合基金项目No.U1933124;中国博士后科学基金项目No.2021M701476;江苏省研究生科研与实践创新计划项目No.SJCX21_1699。

摘　　要：为提高热障涂层黏结层高温抗氧化性能,本工作利用强流脉冲电子束(HCPEB)技术对低压等离子喷涂(LPPS)制备的NiCrAlY黏结层表面进行辐照改性处理,并揭示辐照改性效应对涂层抗氧化行为的影响。对比研究了HCPEB改性前后NiCrAlY涂层微观组织演变行为、1150℃静态氧化性能以及热生长氧化物(TGO)残余应力分布。微观分析结果表明,LPPS喷涂态涂层表面粗糙、存在较多未熔大颗粒;HCPEB改性态涂层表面平整光滑,形成厚约12μm的致密重熔层,其内部形成丰富的变形结构以及Y-Al富集纳米分散颗粒。1150℃静态氧化实验及TGO残余应力测试结果表明,喷涂态涂层氧化150 h后氧化膜出现脱落、内氧化严重,应力陡然下降。相比之下,HCPEB改性态涂层在整个氧化周期内表面氧化膜均能稳态生长,未出现剥落迹象,其TGO应力以稳定且缓慢的趋势增加。结果表明,HCPEB辐照改性技术可以有效提高MCrAlY涂层的抗高温氧化性能。MCrAlY-type coatings are widely applied to thermally loaded structures of aero-engines as standalone overlays and as a bond-coat for a thermal barrier coating system,owing to their good resistance to high-temperature oxidation and hot corrosion.The thermally grown oxide(TGO)formed at the interface is the primary factor affecting the durability of MCrAlY coatings,which is closely related to the coating method used.The coating performed by low-pressure plasma spraying(LPPS)has great adhesion,high deposition rate,and low internal oxidation.However,the prepared defects of rough surface and porosity adversely affect the antioxidant performance.High-current pulsed electron beam(HCPEB),as a powerful tool for surface modification of different materials,can normalize the defects,polish the coating surface,and reconstruct microstructures,which is crucial to promote steady growth of the protective TGO.Therefore,in this work,NiCrAlY coatings were prepared on the surface of a nickel-based superalloy via LPPS and then irradiated via HCPEB.The microstructural evolution,static oxidation performance at 1150oC,and TGO residual stress distribution of NiCrAlY coatings before and after HCPEB modification were compared.The microstructural results show that the surface of the as-sprayed coating was rather rough and there were many unmelted large particles.After HCPEB irradiation,the surface of the irradiated coating was remelted,and became much flat and smooth.A rather dense and compact remelted layer approximately 12μm in thickness was obtained.Furthermore,deformation structures and Y-Al enriched nanodispersed particles were introduced inside the remelted layer.The results of static oxidation and TGO residual stress show that after 150 h of oxidation,the oxide film formed on the as-sprayed coating fell off locally,accompanied by serious internal oxidation.Due to the cracking and peeling of the TGO,the internal stress was released.Conversely,the oxide film on the remelted surface of HCPEB irradiated coating grew steadily,and there was

关 键 词：低压等离子喷涂(LPPS) 强流脉冲电子束(HCPEB) NICRALY涂层 微观组织 抗高温氧化性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]