SiC_(f)/SiC复合材料表面Si/Yb_(2)Si_(2)O_(7)涂层1350℃抗热冲击和抗热冲刷性能研究  

Thermal Shock Resistance and Thermal Erosion Resistance at 1350℃of Si/Yb_(2)Si_(2)O_(7) Coatings on Surface of SiC_(f)/SiC Composites

作　　者：陈易诚 邓杨芳 张乐 韦林 李其连 周国栋 CHEN Yicheng;DENG Yangfang;ZHANG Le;WEI Lin;LI Qilian;ZHOU Guodong(Department of Material and Processing,AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China;Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]中国航发四川燃气涡轮研究院材料工艺室,四川成都610500 [2]中国航空制造技术研究院高能束流加工技术重点实验室,北京100024

出　　处：《材料保护》2024年第8期58-64,104,共8页Materials Protection

基　　金：国家科技重大专项(2017-Ⅵ-0020-0092)。

摘　　要：为了研究Si/Yb_(2)Si_(2)O_(7)涂层在1350℃条件下的抗热冲击和抗热冲刷性能,首先在SiC_(f)/SiC复合材料上采用真空等离子喷涂技术制备了Si/Yb_(2)Si_(2)O_(7)涂层,并采用金相、物相、SEM、EDS、燃气热冲击设备和燃气热冲刷设备对试样进行了结构及性能表征。结果表明:涂层与SiC_(f)/SiC复合材料的结合强度为25.01 MPa。经过1350℃燃气热冲击1000次,1350℃、550 m/s燃气热冲刷1 h后,Yb_(2)Si_(2)O_(7)涂层的表面物相均主要为Yb_(2)Si_(2)O_(7)、Yb_(2)SiO_(5)、Yb_(2)O_(3)和SiO_(2),抗热冲击和抗热冲刷2项性能测试结果均达设计要求。涂层结合强度很高,复合材料、Si层和Yb_(2)Si_(2)O_(7)层耐高温且热匹配性能较好,且面层的抗燃气腐蚀能力很强,是涂层热冲击、热冲刷性能良好的主要原因。燃气热冲刷的燃气燃烧时间比燃气热冲击的总时间短,且热冲刷为恒温连续冲刷,无冷热的剧烈交替变化,故燃气冲刷后涂层边缘处靠近工装装卡的地方未见明显开裂,且连续冲刷后的黑色烧蚀区域较燃气热冲击的面积小。In order to study the thermal shock resistance and thermal erosion resistance of Si/Yb_(2)Si_(2)O_(7) coatings at 1350℃,Si/Yb_(2)Si_(2)O_(7) coatings were prepared on SiC_(f)/SiC composites by vacuum plasma spraying technology.Subsequently,the structure and performance of the sam-ples were characterized by metallography,physical phase,SEM,EDS,gas thermal shock equipment and gas thermal flushing equipment.Results showed that the bonding strength between the coating and SiC_(f)/SiC composite material was 25.01 MPa.After 1350℃gas thermal shock for 1000 times and 1350℃,550 m/s gas thermal scouring for 1 h,the surface phases of the Yb_(2)Si_(2)O_(7)coating were mainly Yb_(2)Si_(2)O_(7),Yb2SiO5,Yb_(2)O_(3)and SiO_(2),and the test results of thermal shock resistance and thermal erosion resistance both met the design requirements.Furthermore,the coating had high bonding strength.The composite materials,Si layer and Yb_(2)Si_(2)O_(7)layer were resistant to high temperature and had good thermal matching performance,and the surface layer had strong resistance to gas corrosion,which was the main reason for the good thermal shock and thermal erosion performance of the coating.Besides,the gas combustion time of gas thermal scouring was shorter than the total time of gas thermal shock,and the thermal scouring was a constant temperature continuous scouring without drastic alternation of hot and cold.Therefore,no obvious cracking was observed at the edge of the coating near the tooling after gas scouring,and the black ablation area after continuous scouring was smaller than the area of gas thermal shock.

关 键 词：SiCf/SiC复合材料 Si/Yb_(2)Si_(2)O_(7)涂层 真空等离子喷涂 抗热冲击 抗热冲刷 

分 类 号：TG174[金属学及工艺—金属表面处理]