High-Temperature Mechanical Properties and Ablation Resistance of 2.5D Shallow Straight-Joint SiO2f/SiO2 Composites

IF 3.3 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2025-03-13 DOI:10.1007/s12633-025-03281-z

Xisheng Xia, Jian Duan, Bangxiao Mao, Dakui Wang, Guosheng Gao

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引用次数: 0

Abstract

In this paper, 2.5D shallow straight-joint SiO_2f/SiO₂ composites (SST1 ~ SST7) were prepared by the sol–gel method. The effects of different ceramization temperatures on the microstructure, high-temperature flexural properties and ablation resistance of the 2.5D shallow straight-joint SiO_2f/SiO₂ composites were studied. The fracture and ablation mechanisms of the composites were analyzed in depth, providing theoretical support for the high-performance preparation of SiO_2f/SiO₂ composites and its stable application in high-temperature environment of aircraft. SST1 ~ SST7 showed different microstructures. The SiO₂ matrix changed from granular to continuous and smooth, and the bonding between the matrix and the fibers gradually becomed stronger. Under the flexural load at 600 ℃, SST1 ~ SST7 exhibited different microstructures and failure mechanisms, which determined the flexural properties at 600 ℃. Among them, SST6 had the best flexural strength (112 MPa) at 600 ℃. Meanwhile, SST6 had the best ablation resistance, with a linear ablation rate of only 2.88 × 10^–2 mm/s. The ablation mechanisms in the ablation centers of SST1 ~ SST6 were all melting and mechanical scouring. However, the ablation mechanism in the ablation center of SST7 were melting, mechanical scouring and mechanical spalling. The ablation mechanisms in the ablation edge areas of SST1 ~ SST7 were all mechanical scouring.

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2.5D浅直接头SiO2f/SiO2复合材料的高温力学性能及抗烧蚀性能

采用溶胶-凝胶法制备了2.5D浅直节SiO2f/SiO2复合材料（SST1 ~ SST7）。研究了不同陶化温度对2.5D浅直节SiO2f/SiO2复合材料微观结构、高温弯曲性能和抗烧蚀性能的影响。深入分析了复合材料的断裂和烧蚀机理，为SiO2f/SiO2复合材料的高性能制备及其在飞机高温环境中的稳定应用提供理论支持。SST1 ~ SST7表现出不同的显微结构。SiO2基体由粒状变为连续光滑，基体与纤维之间的结合逐渐增强。在600℃弯曲荷载作用下，SST1 ~ SST7表现出不同的微观组织和破坏机制，这决定了SST1 ~ SST7在600℃下的弯曲性能。其中，SST6在600℃时的抗弯强度最高，为112 MPa。同时，SST6的抗烧蚀性能最好，线性烧蚀速率仅为2.88 × 10-2 mm/s。SST1 ~ SST6烧蚀中心的烧蚀机制均为熔融和机械冲刷。而SST7烧蚀中心的烧蚀机制主要为熔融、机械冲刷和机械剥落。SST1 ~ SST7烧蚀边缘区域的烧蚀机制均为机械冲刷。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.