Preparation and infrared/millimeter wave attenuation properties of magnetic expanded graphite by explosive combustion
A composite based on magnetic iron particles and expanded graphite was prepared by an explosive combustion and blending method. It was then introduced into a smoke canister, and colloidal silicone rubber (RTV-615) was used as an infrared and millimeter wave absorber. The infrared shielding effectiveness was investigated by measuring the thermal extinction using the smoke canister for dynamic testing with a thermal imager in the 8–12 μm range. The millimeter wave absorbing properties were investigated by measuring the transmission loss in the 32–38 GHz microwave frequency range with a network analyzer using the free space method. The effects of structure, media material type (carbonyl iron powder and Fe3O4 and weight ratio on the infrared/millimeter wave attenuation properties of magnetic expanded graphite were also studied. The results showed that the magnetic expanded graphite had excellent infrared (8–12 μm) and millimeter wave (35 GHz) interference abilities and could be used as a new material for obscuring infrared and millimeter waves. For magnetic expanded graphite with a concentration of 2 mg/cm3, the thermal extinction reached 31 °C, and at a weight ratio (expanded graphite:magnetic iron particles) of 2:1 (3 mg/cm3 and a thickness of 1.5 mm, the minimum transmission loss value was –10.8 dB in the 32–38 GHz range.
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Document Type: Research Article
Publication date: February 1, 2016
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