层状硅酸钇改性SiC_f/SiC复合材料湿氧化行为研究（英文）  

Oxidation Behavior of SiCf/SiC Composites Modified by Layered-Y2Si2O7 in Wet Oxygen Environment

作　　者：王鹏[1,2] 王庆雷 张翔宇[1,2] 杨金山[1,2] 周海军 胡建宝[1,2] 丁玉生 董绍明[1,2] WANG Peng;WANG Qing-Lei;ZHANG Xiang-Yu;YANG Jin-Shan;ZHOU Hai-Jun;HU Jian-Bao;DING Yu-Sheng;DONG Shao-Ming(State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Beijing Institute of Space Mechanics & Electricity, Beijing 100076, China)

机构地区：[1]中国科学院上海硅酸盐研究所,高性能陶瓷与超微结构国家重点实验室,上海200050 [2]中国科学院大学材料与光电研究中心,北京100049 [3]北京空间机电研究所,北京100076

出　　处：《无机材料学报》2019年第8期904-908,共5页Journal of Inorganic Materials

基　　金：National Key Research and Development Program of China(2016YFB0700202);National Natural Science Foundation of China(51772310);Chinese Academy of Sciences Key Research Program of Frontier Sciences(QYZDY-SSW-JSC031);Chinese Academy of Sciences Pioneer Hundred Talents Program,Shanghai Pujiang Program(17PJ1410100);Young Elite Scientist Sponsorship Program by China Academy of Space Technology(2017QNRC001)

摘　　要：研究了层状硅酸钇的引入对SiCf/SiC复合材料湿氧化行为的影响。首先通过硝酸钇乙醇溶液浸渍热解法向碳化硅纤维引入Y2O3,再采用化学气相渗透法沉积SiC。层状Y2Si2O7主要通过Y2O3与沉积过程中的SiC反应转化而成。研究发现, Y2Si2O7在1400℃湿氧环境条件下发生富集,在氧化层表面形成保护层。氧化80 h后,单层和多层Y2Si2O7改性的SiCf/SiC复合材料强度保留率分别达到60.38%和71.93%,而没有改性的SiCf/SiC复合材料强度保留率仅为50.11%。结果表明:层状Y2Si2O7的引入可显著提升SiCf/SiC复合材料在湿氧环境的抗氧化性能。SiCf/Si C composites modified by layered Y2Si2O7 were presented in this research. Layered Y2Si2O7 was transformed from yttrium oxide by chemical vapor infiltration process in SiC fiber preform, in which yttrium oxide was generated by the solution impregnation and pyrolysis method. Oxidation behavior of the layered-Y2Si2O7 modified SiCf/SiC composites was studied in the wet oxygen environment at 1400 ℃, showing that Y2Si2O7 can concentrate on the oxidation surface to form a protective layer during the oxidation process. The bending strengths of SiCf/SiC composites with one layer or three layers of Y2Si2O7 remain 60.38% and 71.93%, respectively, after the oxidation for 80 h. In contrast, it is only 50.11% for SiCf/SiC composites without Y2Si2O7. Therefore, layered distribution of Y2Si2O7 significantly improves the oxidation resistance of SiCf/SiC composites in wet oxygen environment.

关 键 词：陶瓷基复合材料 稀土硅酸盐 氧化 

分 类 号：TQ174[化学工程—陶瓷工业]