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

Abstract

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 cross-helix-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 metamaterials. 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.

Mechanically Reinforced Rigid Polyimide Foam via Chemically Grafting Isocyanate Acid for Ultrabroad Band Microwave Absorption

“…However, the over high electrical conductivity induced by higher CNT fillers content leads to major microwave reflection on the foam surface and the slight incident microwave are unable to effectively dissipate inside of the 3D structure because of the less foaming density, failing to produce a breakthrough in MA performance. Hence it is necessary to evaluate the MA performance-related factors, i.e., attenuation constant (α) and characteristic impedance ( Z ) as the following equations (eqs and ). It should be clear that excellent MA performance comes from two aspects: proper attenuation constant rooting in sufficient microwave dissipation and ideal impedance matching allowing adequate microwave incidence into the materials. α = 2 c π f × false( μ ″ ε ″ − μ ′ ε ′ false) + false( μ ″ ε ″ − μ ′ ε ′ false) 2 + false( μ ′ ε ″ + μ ″ ε ′ false) 2 Z = μ ε = μ ε · …”

Multioctagonal Ring Metamaterial with Broadband Microwave Absorption at Elevated Temperature

“…EAB of recently reported high-temperature microwave absorbing metamaterials. [16][17][18][19][20][33][34][35][36][37] (AB: absolute bandwidth, RB relative bandwidth).…”

Bridged polysilsesquioxane‐derived SiOCN ceramic aerogels for microwave absorption

“…The electromagnetic wave absorption performance of PDC can be adjusted by controlling the morphology, composition, and structure of PDC. 1,2 In the previous work, different shapes of PDC powders, [10][11][12] fibers, [13][14][15] aerogels, [16][17][18][19][20][21][22] bulk, 23,24 and metamaterials 25 can be prepared owing to the availability of well-established thermoplastic shaping techniques. Furthermore, the flexible designability of ceramic polymer molecules affords not only binary, 26 ternary, 10,27 and quaternary 24,28 ceramics but also a wide variety of multicomponent compounds.…”