A rubber microwave‐absorbing material was prepared by compounding methyl vinyl silicone rubber (VMQ) and 45 vol% carbonyl iron powder (CIP). When used in a high‐temperature environment at long periods, the material undergoes thermal aging and rapid degradation. This work mainly aimed to investigate the thermal behavior and aging failure mechanisms of such material during hot‐air aging at 200°C. The mechanical and electromagnetic properties were measured with an electronic tensile testing machine and a network analyzer, respectively. Results indicate that CIP was oxidized by oxygen in the aging process and produced reactive oxygen species, which catalyzed the cross‐linking of VMQ. The increased cross‐linking density changed the mechanical properties and enhanced the thermal stability of the CIP/VMQ composite‐absorbing material. Thermal aging gradually penetrated the surface and proceeded into the interior of the material. The microwave‐absorbing properties deteriorated after hot‐air aging.
This paper uses simulation methods to verify the reliability of applying glass ferroaluminium alloy laminates to subway fan blades. Through the force analysis of its blades, it is found that the material has a wider application prospect in subway fan blades, and it can achieve better energy-saving effects than the existing aluminium alloy blades.
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