Carbon nanotubes and montmorillonite reinforced carbon foam composites containing hollow microspheres

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-04-15 DOI:10.1007/s42823-024-00727-z

Heng Wang, Bin Wang, Bingyao Su, Yue Cao, Linwei Hou

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Abstract

Carbon foam composites containing hollow microspheres, reinforced by carbon nanotubes (CNTs) and montmorillonite (MMT), have been developed as the thermal insulation and EMI shielding layer. The effects of additive amounts of CNTs/MMT on microstructure and properties of the carbon foam composites were investigated. Results showed that carbon foam composites had hierarchical porous structure, with CNTs and MMT being relatively uniformly dispersed in the composites. The addition of multiscale additives improved the mechanical, electromagnetic shielding effectiveness and thermal insulation properties of carbon foam composites. The composites containing 0.2 wt.% CNTs and 5 wt.% MMT, showed outstanding compressive strength, up to 8.54 MPa, increased by 116% to pure carbon foam. Their electromagnetic shielding effectiveness was as high as 65 dB, increased by 75%. Due to the hierarchical porous structure and MMT’s heat barrier effect, carbon foam composites presented remarkable thermal insulation properties. The minimum thermal conductivity was 0.45 W·m⁻¹·K⁻¹ at 800 °C. Their exceptional thermal protection can also be evidenced by ablation resistance under flame at 1000 °C. Therefore, such multifunctional carbon-based composites are ideal for use in thermal protection.

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含有空心微球的碳纳米管和蒙脱土增强碳泡沫复合材料

已开发出含有空心微球的碳泡沫复合材料，该复合材料由碳纳米管（CNT）和蒙脱石（MMT）增强，可用作隔热层和电磁干扰屏蔽层。研究了碳纳米管/MMT 添加量对碳泡沫复合材料微观结构和性能的影响。结果表明，碳泡沫复合材料具有分层多孔结构，CNT 和 MMT 相对均匀地分散在复合材料中。多尺度添加剂的加入改善了碳泡沫复合材料的机械性能、电磁屏蔽效果和隔热性能。含有 0.2 wt.% CNTs 和 5 wt.% MMT 的复合材料显示出卓越的抗压强度，最高可达 8.54 MPa，比纯泡沫碳提高了 116%。其电磁屏蔽效果高达 65 dB，提高了 75%。由于分层多孔结构和 MMT 的隔热效果，碳泡沫复合材料具有显著的隔热性能。800 °C 时的最小导热系数为 0.45 W-m-1-K-1。在 1000 °C火焰下的抗烧蚀性也证明了其卓越的热保护性能。因此，这种多功能碳基复合材料是热防护领域的理想选择。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.