多层结构热障涂层的抗热震性能  

Thermal Shock Resistance of Multilayer Thermal Barrier Coatings(TBCs)

作　　者：李江涛[1] 李争显[2] 刘林涛[3] 胡祯[3] Li Jiangtao;Li Zhengxian;Liu Lintao;Hu Zhen(Northeastern University,Shenyang 110819,China;Northwest Institute for Nonferrous Metal Research,Xi＇an 710016,China）（3.Xi＇an University of Architecture and Technology,Xi＇an 710055,China)

机构地区：[1]东北大学,辽宁沈阳110819 [2]西北有色金属研究院,陕西西安710016 [3]西安建筑科技大学,陕西西安710055

出　　处：《稀有金属材料与工程》2018年第8期2435-2439,共5页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划("973"计划)(2012CB625105);陕西省海洋先进金属材料创新团队(2016KCT-27);西安建筑科技大学博士创新基金(6040300566);陕西省稀有金属材料表面工程技术研究中心2015年后补助

摘　　要：采用电子束物理气相沉积技术(EB-PVD)在镍基单晶合金N5基体上制备了双层热障涂层(粘结层+陶瓷层)和三层热障涂层(粘结层+混合层+陶瓷层),并对2组涂层体系的热循环性能进行1100℃保温5 min水冷的热震实验,采用扫描电镜、能谱仪以及X射线衍射对其微观组织结构进行了分析。研究发现,在粘结层和陶瓷层之间添加的混合层(NiCrAlY+YSZ)能够延缓TGO层的生长,并具有缓解内应力的作用,两者的共同作用使得三层结构的热障涂层表现出更为优异的热匹配性。Two layer and three layer TBCs were deposited by electron beam physical vapor deposition （EB-PVD） on the Ni-based superalloy （N5）. Thermal shock test of the coatings was carried out by heating the coating from room temperature to 1100 ℃ for 5 min, followed by water quenching. The microstructural characterization was analyzed by SEM, EDS and XRD. Results show that the mixture layer, composited by NiCrAlY and YSZ, can retard the growth of TGO layer and reduce the inter-stress between bond coating and top coating; thus the thermal matching performance of the three layers TBCs is better than that of the two laver TBCs.

关 键 词：热障涂层 TGO 热震 匹配性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]