碳化硅复合材料的水氧腐蚀机理  

Corrosion Mechanism of Silicon Carbide Composite by H2O–O_(2)

作　　者：曾雨琪 李归 宋阁 罗潇 黄晶琪 陈文博 李坚 徐友良 曹学强[2] ZENG Yuqi;LI Gui;SONG Ge;LUO Xiao;HUANG Jingqi;CHEN Wenbo;LI Jian;XU Youliang;CAO Xueqiang(Hunan Aviation Powerplant Research Institute,Aero Engine Corporation of China,Hunan Zhuzhou 412000,China;Wuhan University of Technology,State Key Laboratory of Silicate Materials for Architectures,Wuhan 430070,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412000 [2]武汉理工大学,硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐学报》2024年第6期1978-1986,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金重点项目(U2241238);中国航发集团自主创新专项基金项目(ZZCX-2017-016)。

摘　　要：为阐明碳化硅复合材料(SiC_(f)/SiC)航空发动机燃气环境中被H_(2)O和O_(2)的腐蚀机理,本工作研究了SiC_(f)/SiC复合材料在水热(无氧)和水氧耦合环境的腐蚀行为。结果表明,SiC_(f)/SiC复合材料连通孔隙是腐蚀介质/产物的进出通道;在200℃无氧水热环境中,Si C被水腐蚀是一个体积膨胀过程,形成乳白色产物H_(2)Si O_(3);在1300℃水氧耦合腐蚀环境中,SiC_(f)/SiC复合材料的纤维与界面层被腐蚀,结构变疏松,腐蚀中间产物为H_(2)SiO_(3),最终产物为方石英SiO_(2)。Introduction SiC_(f)/SiC ceramic matrix composites can replace high-temperature alloys in manufacturing high-temperature structural parts of aerospace engines due to their excellent properties.In a gas environment,SiC_(f)/SiC composite materials have a challenge from corrosion by water vapor and oxygen.The specific process of SiC_(f)/SiC corrosion by water vapor–oxygen coupling is not yet clarified.Therefore,investigating its corrosion behavior is of extremely important significance in guiding the protection of SiC_(f)/SiC from corrosion and ensuring the application of high-temperature components.In this paper,the water-oxygen corrosion behavior of SiC_(f)/SiC was simulated via hydrothermal corrosion experiment in water environment and water–oxygen corrosion experiment in water–oxygen coupling environment,respectively.Methods In the hydrothermal corrosion experiment,SiC_(f)/SiC was placed in deionized water in a closed container and kept in an oven at 200℃for 2450 h.The pressure inside the container was approximately 2 MPa.After the corrosion was completed,the aqueous solution was taken out and dried in an oven at 35℃,and the dried powder was characterized.In the water-oxygen corrosion experiment,SiC_(f)/SiC was placed in a closed high-temperature furnace tube,and water vapor–oxygen mixed gas(A volume ratio of 90%:10%)was injected into the furnace tube.The pressure inside the furnace tube was normal pressure,the temperature was maintained at 1300℃for 50-200 h.The crystal structure of water-oxygen corrosion products was analyzed by X-ray diffraction(XRD,Smart Lab.,Japan).The morphology and composition of SiC_(f)/SiC and its corrosion products were determined by scanning electron microscopy(SEM,Zeiss Co.,Germany).The Si content in hydrothermal corrosion products dissolved in aqueous solution was measured by inductively coupled plasma(ICP,Leeman Prodigy 7,USA).The electronic states of Si and O in the hydrothermal corrosion products were characterized by X-ray photoelectron spectroscopy(ESCALAB 250Xi,XP

关 键 词：碳化硅 复合材料 水氧腐蚀 

分 类 号：TB306[一般工业技术—材料科学与工程]