期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 4, 页码 1322-1331出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.12.003
关键词
3D printing; Polymer-derived ceramics; Honeycomb structure; Mechanical strength; Electromagnetic absorption property
资金
- Youth Innovation Promotion Association Chinese Academy of Sciences (CAS) [2017045]
- Major Scientific and Technological Innovation Projects in Shandong Province [2019JZZY010316]
The study successfully fabricated SiCN honeycomb ceramic with excellent mechanical and microwave-absorbing properties by optimizing the ratio of multifunctional acrylates. At low temperatures, the free carbon nanodiamonds formed through the copolymerization of acrylate and polysilazane give SiCN honeycomb ceramic an extremely high microwave absorption rate.
The combination of 3D printing technology and polymer-derived ceramic route provides an attractive strategy to construct microwave-absorbing honeycomb with fine structure through flexible process. However, preparation of honeycomb ceramics with both excellent mechanical and microwave-absorbing properties is still challenging. Herein, SiCN honeycomb ceramic was fabricated by stereolithography from UV curable polymeric precursor consisting of polysilazane and multifunctional acrylates. By optimizing the multifunctional acrylates and its ratio, the decomposition of organic moiety and the ceramization process of precursor are matched, rendering the achieved ceramic with high compactness. The hardness and specific compressive strength of SiCN honeycomb ceramic reach as high as 14.3 GPa and 333.3 MPa/(g.cm(3)), respectively. Meanwhile, at low pyrolysis temperature, the copolymerized acrylate and polysilazane that formed during curing process was converted to free-carbon nanodamins in-situ, which endows SiCN honeycomb ceramic with the minimum reflection loss of -49.0 dB, namely microwave absorption rate over 99.99%.
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