Kim, Sang Woo Lee, Sung Jae 2024-01-19T13:38:51Z 2024-01-19T13:38:51Z 2022-03-07 2007 0255-5476 https://pubs.kist.re.kr/handle/201004/116426 In order to achieve effectively high electromagnetic absorption in the radio frequency for the application of the electromagnetic absorber, we investigated annealing effect of microforged powders on electromagnetic absorption behaviors of ferromagnetic Fe-Cr alloy metal powder-polymer composites. The power loss in the far field regime was improved with increasing the microforging time in the frequency range from 50 MHz to near 1 GHz, because the magnetic permeability was slightly increased in the frequency range due to the high aspect ratio of the microforged metal powders. At higher frequency more than similar to 1 GHz, there was no further increased in power loss because of development of internal strain during microforging process. The magnetic permeability was significantly increased with annealing temperature due to the reduction of the lattice strain of the microforged powders. As a result, the electromagnetic absorption of ferromagnetic Fe-Cr alloy metal powder-polymer composites was highly improved. English TRANS TECH PUBLICATIONS LTD Electromagnetic absorption behaviors of ferromagnetic Fe-Cr alloy powder and polymer composites in the radio frequency range Conference 10.4028/www.scientific.net/MSF.544-545.299 1 8th International Symposium on Eco-Materials Processing and Design, v.544-545, pp.299 - + 8th International Symposium on Eco-Materials Processing and Design 544-545 299 + SZ Kitakyushu, JAPAN 2007-01-11 ECO-MATERIALS PROCESSING AND DESIGN VIII 000246224300075 2-s2.0-38349092786 Proceedings Paper