Title : Additive manufacturing of molecular-level-engineered SiCN ceramic modified with carbon nanomaterials /transition metal carbides towards next-generation electromagnetic metamaterials
Abstract:
Ceramic-based high-temperature electromagnetic absorption materials (EMAMs) is playing an increasingly important role in combating the EM pollution. However, ceramic-based EMAMs always suffer from unsatisfactory EM performance limited by the material characteristic as well as the monotonous loss mechanism of absorbents. In this project, advanced SiCN matrix modified with one dimensional (1D) carbon nanomaterials/2D transition metal carbides (TMC, e.g., TiC, VC and Mo2C) (CNMs/TMCs-SiCN) ceramic based structural EM metamaterials will be innovatively developed by combining molecular-level-engineered polymer derived ceramic (PDC) and Additive Manufacturing (AM) techniques. Novel 2D TMC nano-absorbents will be developed via a precursor-derived method. Outstanding EM performance is expected to be realized by the establishment of multi-loss mechanisms (i.e., interface, defect-induced and dipole polarization loss, and conductive loss) via nano/microstructure engineering of CNMs/TMC absorbents, and realization of novel meta-structures using AM. The main idea of the present proposal is to merge material type and nano/microstructure innovation of absorbents as well as meta-structure innovation of materials to innovatively develop the CNMs/TMCs-SiCN structural EM metamaterials as the next generation high-temperature structural EMAMs. The general relationship between (nano- and micro-)structure, macro-structure (by design) and loss mechanisms, EM and mechanical properties will be revealed. This project will pave new avenue for the development of next generation EMAMs.
