Damage mechanisms of SiC fibers and BN interphase in SiCf/SiC composites during NITE process

IF 12.7 1区 材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY Composites Part B: Engineering Pub Date : 2024-10-28 DOI:10.1016/j.compositesb.2024.111923
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Abstract

In this work, the mechanical behavior of NITE-SiCf/SiC composites, accompanied by the damage mechanisms of SiC fibers and BN interphase during NITE process, are investigated. The results show that the fracture characteristic of NITE-SiCf/SiC composite is transformed from quasi-ductile mode to brittle mode with the elevating temperature, as well as severe damage of SiC fiber and BN interphase. The damage of SiC fibers is originated from high temperature, sintering aids corrosion and matrix compression. High temperature and sintering aids diffusion lead to the grain growth and strength degradation of SiC fibers. The damage of BN interphase is caused by the sintering aids corrosion, mainly the reaction of Al2O3, and matrix compression. The stress distribution is simulated via finite element analysis proving that up to 17.5 GPa and 17.0 GPa stress originated from matrix shrinkage during sintering process is applied to the fiber and interphase respectively, making the fiber deformation and interphase fragmentation. The degraded fiber strength and destroyed interphase structure weaken the load-bearing capacity and crack deflection ability, causing degradation of mechanical properties and reliability of composites. This work helps to comprehensively understand and optimize the properties of SiCf/SiC composites prepared by NITE process.
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NITE 工艺过程中 SiCf/SiC 复合材料中 SiC 纤维和 BN 相间的损伤机理
本文研究了 NITE-SiCf/SiC 复合材料的力学行为,以及 NITE 过程中 SiC 纤维和 BN 相间层的损坏机制。结果表明,随着温度的升高,NITE-SiCf/SiC 复合材料的断裂特征从准韧性模式转变为脆性模式,SiC 纤维和 BN 相间层也发生了严重破坏。碳化硅纤维的损坏源于高温、烧结辅助腐蚀和基体压缩。高温和烧结助剂扩散导致碳化硅纤维晶粒长大和强度下降。BN 相间层的损坏是由烧结辅助腐蚀(主要是 Al2O3 反应)和基体压缩造成的。通过有限元分析模拟的应力分布证明,烧结过程中基体收缩产生的高达 17.5 GPa 和 17.0 GPa 的应力分别作用于纤维和相间层,导致纤维变形和相间层破碎。纤维强度的降低和相间结构的破坏削弱了复合材料的承载能力和裂纹变形能力,导致复合材料的力学性能和可靠性下降。这项工作有助于全面了解和优化采用 NITE 工艺制备的 SiCf/SiC 复合材料的性能。
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来源期刊
Composites Part B: Engineering
Composites Part B: Engineering 工程技术-材料科学:复合
CiteScore
24.40
自引率
11.50%
发文量
784
审稿时长
21 days
期刊介绍: Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.
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