Mechanical and electromagnetic interference shielding properties of in-situ grown Si3N4nw synergistic defective-graphene reinforced alumina ceramics

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2024-11-05 DOI:10.1016/j.compositesb.2024.111945

Yameng Jiao , Qiang Song , Xu Yang , Liyuan Han , Caixiang Xiao , Fei Zhao , Hejun Li

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引用次数: 0

Abstract

Ceramic matrix composites have versatile application potential but are astricted by brittleness and single function. It can be ameliorated assisted by reinforcements, but the uneven distribution of reinforcements seriously limits the reinforcing efficiency. In this work, the layered porous skeleton of alumina (Al₂O₃) and silicon dioxide (SiO₂) was prepared, then defective-graphene (DG) and silicon nitride nanowires (Si₃N₄nw) were successively grown in-situ in the skeleton (Al₂O₃/SiO₂-G-Si₃N₄nw) to concurrently strength and toughen, as well as endow Al₂O₃ ceramic with electromagnetic interference (EMI) shielding performance. Subsequently, Al₂O₃/SiO₂-G-Si₃N₄nw preform was sintered to construct a uniform Si₃N₄nw synergistic DG enhancement network. The optimum flexural strength and fracture toughness of the sintered ceramic reached 388.52 MPa and 11.29 MPa m^1/2, respectively. This was mainly since DG can fine the ceramic grains, induce crack deflection and furcation, while the uniformly distributed Si₃N₄nw consumed additional energy during the pull-out process. In addition, the EMI shielding effectiveness of the sintered ceramics in X-band was up to 31.77 dB, which is mainly attributed to the conductive loss, dipole polarization loss and interfacial polarization loss of DG. Remarkably, this work provides an idea for efficient strengthening, toughening and integration of structure and function.

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原位生长的 Si3N4nw 协同缺陷石墨烯增强氧化铝陶瓷的机械和电磁干扰屏蔽性能

陶瓷基复合材料具有广泛的应用潜力，但受限于脆性和单一功能。虽然可以通过增强材料来改善这一问题，但增强材料分布不均严重限制了增强效率。在这项工作中，首先制备了氧化铝（Al2O3）和二氧化硅（SiO2）的层状多孔骨架，然后在骨架（Al2O3/SiO2-G-Si3N4nw）中相继原位生长出缺陷石墨烯（DG）和氮化硅纳米线（Si3N4nw），使其同时具有强度和韧性，并赋予 Al2O3 陶瓷电磁干扰（EMI）屏蔽性能。随后，对 Al2O3/SiO2-G-Si3N4nw 预型件进行烧结，以构建均匀的 Si3N4nw 协同 DG 增强网络。烧结陶瓷的最佳抗弯强度和断裂韧性分别达到了 388.52 MPa 和 11.29 MPa m1/2。这主要是因为 DG 可以细化陶瓷晶粒，诱导裂纹偏转和毛化，而均匀分布的 Si3N4nw 在拉拔过程中会消耗额外的能量。此外，烧结陶瓷在 X 波段的电磁干扰屏蔽效果高达 31.77 dB，这主要归因于 DG 的导电损耗、偶极子极化损耗和界面极化损耗。值得注意的是，这项工作为高效强化、增韧以及结构与功能的整合提供了一种思路。

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来源期刊

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.