Yb2Si2O7改性SiC/SiC复合材料的氧化行为研究

doi:10.15541/jim20240148

无机材料学报 ›› 2025, Vol. 40 ›› Issue (3): 323-328.DOI: 10.15541/jim20240148 CSTR: 32189.14.10.15541/jim20240148

Yb₂Si₂O₇改性SiC/SiC复合材料的氧化行为研究

穆爽¹^,²(), 马沁¹^,², 张禹¹^,², 沈旭¹^,², 杨金山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

收稿日期:2024-03-27 修回日期:2024-05-13 出版日期:2025-03-20 网络出版日期:2024-05-16
通讯作者: 杨金山, 研究员. E-mail: jyang@mail.sic.ac.cn;
董绍明, 研究员. E-mail: smdong@mail.sic.ac.cn
作者简介:穆爽(1995-), 女, 博士研究生. E-mail: 2285489162@qq.com

Oxidation Behavior of Yb₂Si₂O₇ Modified SiC/SiC Mini-composites

MU Shuang¹^,²(), MA Qin¹^,², ZHANG Yu¹^,², SHEN Xu¹^,², YANG Jinshan¹^,²(), DONG Shaoming¹^,²()

1. State Key Laboratory of High Performance Ceramics & 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

Received:2024-03-27 Revised:2024-05-13 Published:2025-03-20 Online:2024-05-16
Contact: YANG Jinshan, professor. E-mail: jyang@mail.sic.ac.cn;
DONG Shaoming, professor. E-mail: smdong@mail.sic.ac.cn
About author:MU Shuang (1995-), female, PhD candidate. E-mail: 2285489162@qq.com
Supported by:
National Natural Science Foundation of China(52222202);National Key R&D Program of China(2022YFB3707700);Project of Shanghai Science and Technology Innovation Action Plan(21511104800);Shanghai Pilot Program for Basic Research-Chinese Academy of Science, Shanghai Branch(JCYJ-SHFY-2021-001);Science Center for Gas Turbine Project(P2022-B-IV-001-001)

摘要/Abstract

摘要：

碳化硅纤维增强碳化硅陶瓷基(SiC/SiC)复合材料具有低密度、耐高温、高强度等优异性能, 在热端部件结构材料领域具有广泛应用前景。本研究通过溶胶-凝胶法在SiC纤维束内引入Yb₂Si₂O₇抗氧化相, 并结合化学气相沉积(CVD)法沉积SiC基体, 制备了Yb₂Si₂O₇改性SiC/SiC(SiC/SiC-Yb₂Si₂O₇)复合材料, 讨论了Yb₂Si₂O₇对SiC/SiC复合材料微观结构、力学性能及氧化行为的影响。结果表明, SiC/SiC复合材料经过1200和1400 ℃空气氧化50 h后的强度保持率分别为77%和69%, 拉伸断口处观察到纤维基体平齐断裂。溶胶-凝胶法引入的Yb₂Si₂O₇在基体中部分呈层状分布, 层状Yb₂Si₂O₇相有利于材料的增韧, 拉伸断口处出现层间脱黏现象, 扩展了SiC/SiC复合材料能量耗散机制。SiC/SiC-Yb₂Si₂O₇复合材料的室温拉伸强度为484 MPa, 在1200和1400 ℃空气中氧化50 h后的剩余强度分别为425和374 MPa, 强度保持率分别为88%和77%, 仍表现出典型的非脆性断裂特征。SiC/SiC复合材料断口处界面氧含量大于SiC/SiC-Yb₂Si₂O₇复合材料, 说明引入Yb₂Si₂O₇缓解了氧向界面内的扩散, 改善了SiC/SiC-Yb₂Si₂O₇复合材料的抗氧化性能。

关键词: SiC/SiC复合材料, 基体改性, Yb₂Si₂O₇, 氧化行为

Abstract:

Silicon-carbide-fiber-reinforced silicon-carbide-ceramic-based matrix (SiC/SiC) composites possess excellent properties such as low density, high strength and high temperature resistance, showing a potential application for structural components in the aerospace field, but their oxidation behavior remains largely unknown. In this study, Yb₂Si₂O₇ modified SiC/SiC (SiC/SiC-Yb₂Si₂O₇) mini-composites were prepared by introducing Yb₂Si₂O₇ as anti-oxidation phase into SiC fiber bundles via Sol-Gel and depositing SiC matrix by chemical vapor deposition (CVD). Influence of Yb₂Si₂O₇ on microstructure, mechanical property and oxidation behavior of SiC/SiC mini-composites was investigated. The results showed that after oxidation in air at 1200 and 1400 ℃ for 50 h, the tensile strength retentions of SiC/SiC mini-composites were 77% and 69%, respectively, and the fracture morphology exhibited flat. The Yb₂Si₂O₇ introduced by Sol-Gel partially distributed in layers, contributing to the toughening of the material. On the fracture surface, there was interlayer debonding, which extended energy dissipation mechanism of SiC/SiC mini-composites. Tensile strength of SiC/SiC-Yb₂Si₂O₇ mini-composites at room temperature was 484 MPa. After oxidation in air at 1200 and 1400 ℃ for 50 h, the tensile strengths decreased to 425 and 374 MPa, resulting in retention rates of 88% and 77%, respectively. It displayed typical non-brittle fracture characteristics. The interface oxygen content of SiC/SiC mini-composites at the fracture surface was higher than that of SiC/SiC-Yb₂Si₂O₇ mini-composites, indicating that introduction of Yb₂Si₂O₇ could alleviate oxygen diffusion towards the interface, and therefore improve the oxidation resistance of SiC/SiC-Yb₂Si₂O₇ mini-composites.

Key words: SiC/SiC mini-composite, matrix modification, Yb₂Si₂O₇, oxidation behavior

中图分类号:

TQ174

穆爽, 马沁, 张禹, 沈旭, 杨金山, 董绍明. Yb₂Si₂O₇改性SiC/SiC复合材料的氧化行为研究[J]. 无机材料学报, 2025, 40(3): 323-328.

MU Shuang, MA Qin, ZHANG Yu, SHEN Xu, YANG Jinshan, DONG Shaoming. Oxidation Behavior of Yb₂Si₂O₇ Modified SiC/SiC Mini-composites[J]. Journal of Inorganic Materials, 2025, 40(3): 323-328.

图/表 7

Fig. 1 Schematic diagram of preparation of Yb2Si2O7 modified SiC/SiC mini-composites

Fig. 2 SEM images of cross-sections of (a, b) coated fibers, (c, e) SiC/SiC, and (d, f) SiC/SiC-Yb2Si2O7 mini-composites

Fig. 3 Tensile force-displacement curves of (a) SiC/SiC and (b) SiC/SiC-Yb2Si2O7 mini-composites

Fig. 4 Fracture morphologies of (a, b) SiC/SiC and (c, d) SiC/SiC-Yb2Si2O7 mini-composites

Fig. 5 Weight change of SiC/SiC and SiC/SiC-Yb2Si2O7 mini-composites during oxidation at 1200 and 1400 ℃ for 50 h with inset showing the weight change during oxidation at 1200 ℃ for 80 h

Fig. 6 Tensile fracture morphologies of (a, c, e) SiC/SiC, and (b, d, f) SiC/SiC-Yb2Si2O7 mini-composites after oxidation at (a-d) 1200 ℃ with EDS results (table at the bottom), and (e, f) at 1400 ℃, respectively

Table 1

Tensile properties of mini-composites

Material	Tensile strength/MPa
Material	As-prepared	Oxidation at 1200 ℃	Oxidation at 1400 ℃
SiC/SiC	506±56	391±69	351±56
SiC/SiC-Yb₂Si₂O₇	484±83	425±21	374±33

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Yb₂Si₂O₇改性SiC/SiC复合材料的氧化行为研究

Oxidation Behavior of Yb₂Si₂O₇ Modified SiC/SiC Mini-composites

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