Oxidation Behavior of Yb2Si2O7 Modified SiC/SiC Mini-composites

doi:10.15541/jim20240148

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 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

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

References 18

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Oxidation Behavior of Yb₂Si₂O₇ Modified SiC/SiC Mini-composites

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