陶瓷基复合材料可磨耗环境障涂层制备及性能  

Preparation and performance of abradable environmental barrier coating on ceramic matrix composites

作　　者：袁世峰 郭婧 郭孟秋 赵春玲 崔永静 焦健 YUAN Shifeng;GUO Jing;GUO Mengqiu;ZHAO Chunling;CUI Yongjing;JIAO Jian(AECC Hunan Aviation Power Plant Research Institute,Zhuzhou 412002,Hunan,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412002 [2]中国航发北京航空材料研究院,北京100095

出　　处：《航空材料学报》2024年第3期82-94,共13页Journal of Aeronautical Materials

基　　金：航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅳ-003-001)。

摘　　要：随着碳化硅陶瓷基复材制备的涡轮外环的逐步应用,与其匹配的可磨耗涂层技术需求迫切。本工作采用大气等离子喷涂技术,制备4层结构的BSAS(Ba_(0.75)Sr_(0.25)Al_2Si_2O_8)-聚酯基可磨耗环境障涂层(A/EBCs),探究工艺参数对可磨耗面层孔隙率的影响规律以及涂层在1300℃下的相结构和组织演变。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、透射电镜(TEM)对涂层相结构、微观组织及成分进行分析表征。结果表明:BSAS-聚酯基可磨耗面层的孔隙率为26.4%~36.8%,BSAS-聚酯粒子温度敏感的参量是主气(氩气)流量、辅气(氢气)流量和喷涂距离,速度敏感的参量是主气(氩气)流量;其中主气(氩气)流量同时对BSAS-聚酯的粒子温度和速度具有反向影响作用。该可磨耗面层在1300℃高温氧化300 h保持单斜相结构,组织和成分稳定,局部析出球状非晶氧化硅颗粒。采用高温高速刮削实验对涂层可磨耗性能进行评价,涂层表面发现纳米高温合金微粒黏附,叶片高度磨损比(IDR)为20%,达到可磨耗封严涂层使用要求。With the application of shrouds made of silicon carbide ceramic matrix composite(SiC-CMCs),the abradable coating technology suitable for SiC-CMCs is urgently needed.The four-layer structure of BSAS(Ba0.75Sr0.25Al2Si2O8)-polyester-based abradable environmental barrier coating(A/EBCs)was prepared by atmospheric plasma spraying.The influence of process parameters on the porosity and the structural evolution of the layer at 1300℃were investigated.The phase structure,microstructure and coating composition were characterized by XRD,SEM,EDS and TEM respectively.The results show that the porosity of BSAS-polyester abradable top layer is 26.4%-36.8%.And the temperature-sensitive parameters of BSAS-polyester particles are primary gas(argon)flow,second gas(hydrogen)flow and spraying distance.In contrast,the speed-sensitive parameters are primary gas(argon)flow.The primary gas(argon)flow has the opposite effect on the particle temperature and velocity of the BSASpolyester.The abradable surface layer is oxidized at 1300℃for 300 h and maintains monoclinic phase structure,stable stucture and composition,and locally precipitates spherical amorphous silicon oxide particles.Furthermore,the coating abradability was evaluated by high-temperature and high-speed scraping test.Nano-scale Ni-based superalloy particles adhesion on the surface of the coating are found,and the blade incursion depth ratio(IDR)is 20%,which meets the requirements of the abradable sealing coating.

关 键 词：可磨耗环境障涂层 等离子喷涂 碳化硅陶瓷基复合材料 BSAS 高温性能 

分 类 号：V261.93[航空宇航科学与技术—航空宇航制造工程] TG174.4[金属学及工艺—金属表面处理]