Mechanical behavior and property evaluations of electromagnetic shielding/far infrared functional composite boards made of nano carbon-stainless steel knitted fabrics and far infrared polypropylene

This study introduces functional composite boards, combining nano carbon yarns, stainless steels, and far-infrared (FIR) polypropylene (PP). Stainless steel filaments are wrapped in nano carbon fibers to form yarns, which are then woven into knitted fabrics. These fabrics are laminated at various angles and combined with FIR powder and PP pellets to create functional slabs. These slabs are hot-pressed to form the composite boards. The boards are tested for various properties, leading to the identification of optimal parameters: 2.5 wt% FIR powder content and a lamination angle of 0°/45°/90°. The optimal boards demonstrate high tensile strength, impact resistance, bending capacity, EMI shielding, and FIR release. Thus, the boards with these parameters offer the best performance.