4.7 Article

Microstructure and mechanical properties of SiCf/SiC composite prepared by chemical vapor infiltration

期刊

CERAMICS INTERNATIONAL
卷 48, 期 24, 页码 36983-36991

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.08.267

关键词

Chemical vapor infiltration; SiC f; SiC composite; Microstructure; Mechanical properties

资金

  1. National Science and Technology Major Project [51872229]
  2. Chinese National Foundation for Natural Sciences [2020JQ-726]
  3. Natural Science Basic Research Plan in Shaanxi Province of China [2021GY-252]
  4. Development Program of Shaanxi Province [2022GY-367]
  5. [2017-VI-0007-0077]

向作者/读者索取更多资源

This study comprehensively evaluated the mechanical properties of continuous SiC fiber reinforced SiC ceramic matrix composites and verified the correlation laws between different properties. The results showed that fiber bridging is the key mechanism controlling this correlation, while interlaminar shear is influenced by matrix cracking and interlaminar pores.
Continuous silicon carbide (SiC) fiber reinforced SiC ceramic matrix (SiCf/SiC) composites are widely studied for possible applications as hot sections in next-generation aeroengines because of their excellent thermo-structural properties. Their mechanical properties were comprehensively evaluated based on the interaction mechanisms among fiber, interphase, and matrix. Moreover, it was found that matrix cracking and fiber bridging mechanisms influenced the shear-dominated and tension-dominated properties, respectively, clearly indicating that the mechanical properties of the material should be correlated. In this study, mechanical properties of the twodimensional SiCf/SiC composite were comprehensively evaluated, and the correlation laws were verified between tension and bending, tension and in-plane shear, and in-plane shear and interlaminar shear. Results showed that the ratio of shear to tensile matrix cracking stress was 0.68, while the ratio of flexural to tensile strength was 2.3, and the interlaminar shear strength was equal to the in-plane shear strength minus the fiber bridging stress. Fiber bridging is the key mechanism controlling the above-mentioned correlation by the established meso-mechanical formulas, and the interlaminar shear mechanism is controlled by matrix cracking and influenced by interlaminar pores.

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