Temperature dependence of the electromagnetic properties and microwave absorption of carbonyl iron particles/silicone resin composites

Microwave absorbing composites with thin thickness and wideband absorption were successfully prepared by a spraying method using carbonyl iron particles (CIP's) as absorbers and silicone resin as the matrix. The value of reflection loss (RL) below -5 dB can be obtained in the frequency range of 5.76-18 GHz for the composite with 0.8 mm thickness. The temperature dependence of electromagnetic properties and RL of the composites were investigated. The RL of the composite showed a slight variation when the temperature reached up to 200 degrees C while decreased at 300 degrees C. The room temperature RL of the composite did not display significant difference before and after the heat treatment at 300 'C for 10 h: the mechanism was also discussed. (C) 2014 Elsevier BM. All rights reserved.