层状硅酸钇改性SiCf/SiC复合材料湿氧化行为研究

doi:10.15541/jim20180590

无机材料学报 ›› 2019, Vol. 34 ›› Issue (8): 904-908.DOI: 10.15541/jim20180590

所属专题：陶瓷基复合材料

• 研究快报 • 上一篇

层状硅酸钇改性SiC_f/SiC复合材料湿氧化行为研究

王鹏^1,²,王庆雷³,张翔宇^1,²(),杨金山^1,²(),周海军^1,²,胡建宝^1,²,丁玉生^1,²,董绍明^1,²

^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

收稿日期:2018-12-17 出版日期:2019-08-20 网络出版日期:2019-05-22
作者简介:WANG Peng(1994-), male, candidate of Master degree. E-mail: wangpeng@student.sic.ac.cn

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

WANG Peng^1,²,WANG Qing-Lei³,ZHANG Xiang-Yu^1,²(),YANG Jin-Shan^1,²(),ZHOU Hai-Jun^1,²,HU Jian-Bao^1,²,DING Yu-Sheng^1,²,DONG Shao-Ming^1,²

^1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
^2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
^3. Beijing Institute of Space Mechanics & Electricity, Beijing 100076, China;

Received:2018-12-17 Published:2019-08-20 Online:2019-05-22
Supported by:
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/Abstract

摘要：

研究了层状硅酸钇的引入对SiC_f/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SiC_f/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SiC_f/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SiC_f/SiC复合材料在湿氧环境的抗氧化性能。

关键词: 陶瓷基复合材料, 稀土硅酸盐, 氧化

Abstract:

SiC_f/SiC composites modified by layered Y₂Si₂O₇were 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-Y₂Si₂O₇modified SiC_f/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 SiC_f/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 SiC_f/SiC composites without Y₂Si₂O₇. Therefore, layered distribution of Y₂Si₂O₇ significantly improves the oxidation resistance of SiC_f/SiC composites in wet oxygen environment.

Key words: ceramic composites, rare-earth silicate, oxidation

中图分类号:

TQ174

王鹏, 王庆雷, 张翔宇, 杨金山, 周海军, 胡建宝, 丁玉生, 董绍明. 层状硅酸钇改性SiC_f/SiC复合材料湿氧化行为研究[J]. 无机材料学报, 2019, 34(8): 904-908.

WANG Peng, WANG Qing-Lei, ZHANG Xiang-Yu, YANG Jin-Shan, ZHOU Hai-Jun, HU Jian-Bao, DING Yu-Sheng, DONG Shao-Ming. Oxidation Behavior of SiC_f/SiC Composites Modified by Layered-Y₂Si₂O₇ in Wet Oxygen Environment[J]. Journal of Inorganic Materials, 2019, 34(8): 904-908.

图/表 6

Fig. 1 Micro-region XRD patterns of samples (a) C0, C1, C2 and P1, and (b) Y2O3 before and after CVI

Fig. 2 SEM images of samples (a) P1 and (b) C1 with insets showing EDS analysis of the white region in sample P1 and C1

Fig. 3 SEM images of the cutting surface of the composites Before oxidation: Sample (a) C0, (b) C1, (c) C2. After Oxidation: Sample (d) C0, (e) C1, (f) C2

Fig. 4 Oxidation models of SiCf/SiC-Y2Si2O7 in wet oxygen

Fig. 5 (a) Mechanical strength and (b) strength retention of the composites after oxidation for different time

Table 1 Density and porosity of the composites

	C₀	C₁	C₂
Porosity/%	8.69±0.27	11.49±0.93	13.63±0.35
Density/(g?cm^-3)	2.75±0.02	2.60±0.02	2.50±0.01

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层状硅酸钇改性SiC_f/SiC复合材料湿氧化行为研究

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

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层状硅酸钇改性SiCf/SiC复合材料湿氧化行为研究

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

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层状硅酸钇改性SiC_f/SiC复合材料湿氧化行为研究

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