Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 449, Issue -, Pages 385-389Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.10.067
Keywords
NdFe magnetic powders; Microwave absorbing property; Impedance matching; Microwave attenuation; Oxidation heat treatment
Funding
- National Natural Science Foundation of China [51564037, 51401103]
- start-up fund of Qingjiang Scholarship [3208600001]
- Ph.D. start-up foundation, Jiangxi University of Science and Technology [3401223239]
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Excellent microwave absorption performance was obtained from NdFe magnetic powders. A suitable oxidation heat treatment temperature can optimize the impedance matching effectively and result in a good absorption performance. By varying the coating thickness, the reflection loss values of oxidized NdFe magnetic powders are less than -10 dB nearly in the whole range of 2-18 GHz. The maximum reflection loss value of the oxidized NdFe magnetic powders at 373 K reaches up to -55.9 dB at 3.6 GHz with a thickness of 3.0 mm. In addition, the microwave absorption peak frequency can also be tuned by the oxidation heat treatment temperature. The obtained results and systematic analysis suggest that NdFe magnetic powders would be attractive candidates for microwave absorbing materials and the oxidation heat treatment could be an effective way to optimize the impedance matching of some ferromagnetic alloy absorption materials. (C) 2017 Published by Elsevier B.V.
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