Enhanced strength and toughness of SiC/C composite ceramics via SiC@graphene core–shell nanoparticles

IF 3.5 3区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2024-09-28 DOI:10.1111/jace.20151
Zhitong Xu, Jian Zhao, Malin Liu, Zebing Liu, Xinyu Cheng, Jiaxing Chang, Xu Yang, Bowen Li, Bing Liu, Rongzheng Liu
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Abstract

Developing high strength and tough silicon carbide (SiC) composite ceramics remains a significant challenge. Here, we report the process of synthesizing fully densified SiC/C composite ceramics using SiC@graphene (SiC@G) core–shell nanoparticles as raw materials through spark plasma sintering (SPS) at 1700°C and 45 MPa. The SiC@G nanoparticles were synthesized by the fluidized bed chemical vapor deposition (FB-CVD) method. During the sintering process, graphene coated, the surface of nanosized SiC particles exhibited high electrical and thermal conductivity, facilitating the uniform distribution of pulse current and heat and promoting the densification of SiC/C composite ceramics. For the prepared SiC/C composite ceramic, the carbon content reaches as high as 14.3 wt%, with carbon uniformly dispersed in a particulate form within the SiC matrix and stable interface bonding. Consequently, the introduction of excessive carbon does not compromise the hardness (28.8 GPa) and flexural strength (517.34 MPa) of the SiC/C composite ceramics. Furthermore, the carbon particles effectively enhance the toughness of the SiC/C composite material through mechanisms such as crack branching, bridging, and deflection, resulting in a fracture toughness of 7.38 MPa m1/2. The preparation strategy in this study provides a novel route for sintering SiC composites with high-carbon content through nanoscale powder structure design, resulting in the attainment of high-performance lightweight composite materials.

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通过 SiC@ 石墨烯核壳纳米粒子提高 SiC/C 复合陶瓷的强度和韧性
开发高强度、高韧性的碳化硅(SiC)复合陶瓷仍然是一项重大挑战。在此,我们报告了以 SiC@石墨烯(SiC@G)核壳纳米粒子为原料,在 1700°C 和 45 MPa 下通过火花等离子烧结(SPS)合成全致密化 SiC/C 复合陶瓷的过程。SiC@G 纳米粒子是通过流化床化学气相沉积(FB-CVD)法合成的。在烧结过程中,涂有石墨烯的纳米 SiC 颗粒表面具有很高的导电性和导热性,有利于脉冲电流和热量的均匀分布,并促进 SiC/C 复合陶瓷的致密化。在制备的 SiC/C 复合陶瓷中,碳含量高达 14.3 wt%,碳以颗粒形式均匀地分散在 SiC 基体中,界面结合稳定。因此,过量碳的引入不会影响 SiC/C 复合陶瓷的硬度(28.8 GPa)和抗弯强度(517.34 MPa)。此外,碳颗粒通过裂纹分支、桥接和挠曲等机制有效提高了 SiC/C 复合材料的韧性,使其断裂韧性达到 7.38 MPa m1/2。本研究的制备策略通过纳米级粉末结构设计,为烧结高碳含量的 SiC 复合材料提供了一条新途径,从而实现了高性能轻质复合材料的制备。
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来源期刊
Journal of the American Ceramic Society
Journal of the American Ceramic Society 工程技术-材料科学:硅酸盐
CiteScore
7.50
自引率
7.70%
发文量
590
审稿时长
2.1 months
期刊介绍: The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.
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Issue Information Issue Information Enhanced strength and toughness of SiC/C composite ceramics via SiC@graphene core–shell nanoparticles Advancement in Raman spectroscopy (RS) for characterizing cementitious materials Low-dielectric-loss ZnZrNb2O8 ceramics combined with H3BO3 for low-temperature co-fired ceramics applications
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