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Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

Nano-Micro Letters 2022年第7期14卷 279-292页

作者： Rui Zhou Yansong Wang Ziyu Liu Yongqiang Pang Jianxin Chen Jie Kong MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Lab of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Key Laboratory of Optical System Advance Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Combining 3D printing with precursor-derived ceramic for fabricating electromagnetic(EM) wave-absorbing metamaterials has attracted great attention. This study presents a novel ultraviolet-curable polysiloxane precursor for digital light processing(DLP) 3D printing to fabricate ceramic parts with complex geometry, no cracks and linear shrinkage. Guiding with the principles of impedance matching, attenuation, and effective-medium theory, we design a crosshelix-array metamaterial model based on the complex permittivity constant of precursor-derived ceramics. The corresponding ceramic metamaterials can be successfully prepared by DLP printing and subsequent pyrolysis process, achieving a low reflection coefficient and a wide effective absorption bandwidth in the X-band even under high temperature. This is a general method that can be extended to other bands, which can be realized by merely adjusting the unit structure of meta-materials. This strategy provides a novel and effective avenue to achieve “target-design-fabricating” ceramic metamaterials, and it exposes the downstream applications of highly efficient and broad EM wave-absorbing materials and structures with great potential applications.

关键词： Electromagnetic wave absorption Metamaterial precursor-derived ceramics 3D printing

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Cross-scale microstructure design of precursor-derived SiC-AlN nanoceramic composites hybrid with ex-situ ZrB_(2)

Advanced Powder Materials

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Advanced Powder Materials 2023年第1期2卷 35-42页

作者： Aidong Xia Buhao Zhang Jie Yin Xiao Chen Sea-Hoon Lee Xuejian Liu Zhengren Huang State Key Laboratory of High Performance ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Ceramic Materials Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

ZrB_(2)/SiC–AlN nanoceramic composites were densified at 1950℃ by hot pressing using an organic-precursorderived SiC and commercially available AlN and ZrB_(2).A cross-scale microstructure was constructed by distributing the ZrB_(2) secondary phase(~421 nm)within the SiC–AlN solid solution *** substructure of the SiC–AlN matrix was agglomerated by nanograins with an average size of only 62 ***_(2) connected around the majority of pores within the SiC–AlN matrix and contributed to the formation of numerous weak interfacial bonding,resulting in improved strength and *** highest flexural strength and fracture toughness of 579±52 MPa and 6.7±0.1 MPa m^(1/2) were obtained from a 10 wt%-ZrB2/SiC–AlN sample,*** high concentration of grain boundaries of the ZrB2/SiC–AlN nanoceramic composites resulted in heat insulation *** thermal diffusivity and conductivity were 3.6 mm^(2)·s^(-1) and 14.3 W⋅(m·K)^(-1) at 1400℃,respectively,while the electrical resistivity was 3.9×10^(3)Ω·cm for the 10 wt%-ZrB_(2)/SiC–AlN sample.

关键词： Nanoceramic composites precursor-derived ceramics SiC-AlN solid Solution Mechanical properties Thermal and electrical properties

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