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2024
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06
Industry New Knowledge... Reduced photopolymerization 3D printing strong electromagnetic wave absorption SiBCN ceramic metamaterials.
Author:
Industry new knowledge
近日，山东理工大学Yurun Feng带领的团队在《Additive Manufacturing》发表了题为Vat photopolymerization 3D printing SiBCN ceramic metamaterials with strong electromagnetic wave absorption的研究，
Using ceramic precursor polymer as raw material, using photopolymerization technology, SiBCN polymer-derived ceramic metamaterials with structure and function were obtained.
Original link: https://www.sciencedirect.com/science/article/abs/pii/S2214860424002859
Adventure Technology official website: http://www.adventuretech.cn/
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research content
In recent years, with the development of 5G communication and military stealth technology, there are higher requirements for electromagnetic wave (EMW) absorbing materials, and polymer derived ceramics (PDC) and PDC-SiBCN ceramics have also received more attention. However, there are few reports on the combination of additive manufacturing (AM) and PDC-SiBCN to prepare absorbing metamaterials.
This study adoptsDigital light processing (DLP) technology to prepare low-density spiral triple period very small surface (TPMS) structure, the preparation of four groups of excellent performance of SiBCN ceramics, play a synergistic effect of structure and material.. The phase composition, macrostructure, graphitization degree and electromagnetic loss capacity of the ceramics were studied.
1 is a schematic diagram of a DLP-SiBCN ceramic metamaterial manufacturing process.
△ Figure 2, CST simulation data and test data for three different structures. (a) Oblique honeycomb; (B) Hexagon honeycomb;(c) Gyroscope.
3, X-ray diffraction spectrum of DLP-SiBCN ceramic.
△ Figure 4,(a-b) The structure of the 3D printing ceramic precursor before and after pyrolysis;(c-f) the scanning electron microscope of the ceramic surface;(g-j) the scanning electron microscope of the ceramic cross-section. (K) EDS data of sample G2.
5,a-d, transmission electron microscopy image of sample G2 (pyrolyzed at 1200 OC).
6,(a) Thermogravimetric analysis curves of precursor and 3D printable mixture; (B) Mechanical property test of sample G2.
7, XPS spectra and fitting curves of DLP-SiBCN ceramics pyrolyzed at different temperatures. (B) silicon;(C)B;(D)C;(E)N;(F)O.
8, Raman spectra of DLP-SiBCN ceramics pyrolyzed at different temperatures. (A) Full spectrum;(B)G1;(C)G2;(D)G3;(E)G4.
△ Figure 9, Dielectric constants of DLP-SiBCN ceramics at different pyrolysis temperatures. (A)ε';(B)ε'',Inset for sample G4;(C)tan δ,Inset for sample G4;(D) Cole-Cole curve, Inset for sample G4;(E) decay constant.
10,(A)ε''c,(B)ε''p,(C)ω''c and (D)ω''p values.
Delta Figure 11, the sample G1-4 at different temperatures with a thickness of 1-5mm | Zin/Z0 | value curve:(A)G1, (B)G2, (C)G3, (D)G4.
12, Increments in impedance matching G1-4 samples pyrolyzed at different temperatures:(A)G1, (B)G2, (C)G3, and (D)G4.
13, Pyrolysis chart of sample G1-4 at different temperatures. Reflection loss 3D maps:(A)G1, (B)G2, (C)G3, (D)G4; Reflection loss 3D projections:(E)G1, (F)G2, (G)G3, (H)G4.
14, Electric field distribution and power loss density of different structures. (A) square structure;(B) rotary cell structure;(C) hexagonal honeycomb;(D) oblique honeycomb.
△ Figure 15, Schematic diagram of EMW absorption mechanism of gyro-DLP-SiBCN assembly.
Delta Figure 16, Comparison of Absorbing Properties of Sample G2 with Other Materials Reported in the Literature.
research conclusion
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DLP is used to print a spiral TPMS structure to improve the reflection of electromagnetic waves in the material at the macroscopic level and increase the contact between the material and the electromagnetic waves.
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Depending on the pyrolysis temperature, β-SiC, graphitic carbon, and turbo-layered carbon crystallize in the polymer-derived DLP-SiBCN ceramic material.
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DLP-SiBCN components with excellent electromagnetic wave absorption properties were successfully prepared, and the mechanism of electromagnetic wave loss in the material was systematically studied.
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This structural material shows great development potential in achieving structural-functional integration in challenging environments.
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