等离子喷涂BSAS环境障涂层SiC_(f)/SiC复合材料扇形燃烧室环境损伤行为  

Damage Behavior of SiC_(f)/SiC Composites With BSAS Environmental Barrier Coating by Plasma Spraying During Sector Combustor Test

作　　者：洪智亮 崔永静 郭洪宝 周晨 侯敬通 蒋婷 王子媛 陈超[3] 冯晓星 HONG Zhiliang;CUI Yongjing;GUO Hongbao;ZHOU Chen;HOU Jingtong;JIANG Ting;WANG Ziyuan;CHEN Chao;FENG Xiaoxing(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an 710072,China;AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海200241 [2]中国航发北京航空材料研究院,北京100095 [3]西北工业大学超高温结构复合材料重点实验室,西安710072 [4]中国航发四川燃气涡轮研究院,成都610500

出　　处：《航空制造技术》2022年第17期110-116,共7页Aeronautical Manufacturing Technology

基　　金：国家科技重大专项(2017–VI–0007–0077)。

摘　　要：针对基于化学气相沉积工艺(CVI)的SiC/SiC陶瓷基复合材料扇形火焰筒,利用扇形燃烧室试验台进行燃气环境性能考核。其中,扇形火焰筒试验件由内/外环和左/右侧板组成,并在其流道表面采用大气等离子喷涂工艺制得BSAS/Mullite/Si 3层结构环境障涂层(EBC)。试验后,取样并分别利用力学性能测试、扫描电子显微镜和X射线衍射分析等手段进行分析,对试验件的力学性能、微观结构和表面相组成的演变进行表征。结果表明,喷涂态涂层主要由单斜结构钡长石BSAS相和BaAl_(2)O_(4)相组成。试验后,核心烧蚀区域主要由斜方晶系莫来石相Al_(2)(Al_(2.8)Si_(1.2))O_(9.6)、立方晶系Si和六方晶系BaAl_(2)O_(4)相组成,可以观测到表面出现硅熔滴和残留孔洞。取样力学性能分析结果显示,涂层完整区域SiC/SiC复合材料的拉伸强度未受影响;核心烧蚀区域,SiC/SiC复合材料的拉伸强度出现明显下降,最终探讨出涂层的高温烧蚀损伤机制。SiC/SiC composites combustor liner which consists of inner liner,outer liner,left and right plate prepared by chemical vapour infiltration process(CVI),was exposed to simulated aero-engine service environment by sector combustor rig.A three-layer BSAS/Mullite/Si environmental barrier coating(EBC)was deposited on the flow surface of the combustor liner by atmospheric plasma spraying.The evolution of the defect,mechanical property,microstructure and surface phase composition of the composite liner subjected to combustion environment were evaluated by mechanical test,scanning electron microscope and X-ray diffraction,respectively.The results indicate that the as-sprayed coating is mainly composed of monoclinic celsian BSAS phase and BaAl_(2)O_(4)phase;After the sector combustor test,the core ablation area is mainly composed of orthorhombic mullite phase Al_(2)(Al_(2.8)Si_(1.2))O_(9.6),cubic Si,and BaAl_(2)O_(4)phases.Meanwhile,silicon droplets and holes can also be observed on the surface.In addition,the results of mechanical properties after the burner rig test show that the tensile strength of SiC/SiC composites in the coating integrity area is not affected,while that of the core ablation area decreased significantly.The high-temperature ablation mechanism of the coating was discussed at final.

关 键 词：环境障涂层(EBC) 等离子喷涂 SiC_(f)/SiC复合材料 BSAS 环境损伤 

分 类 号：V261.933[航空宇航科学与技术—航空宇航制造工程]