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Niobium-doped barium ferrite wave-absorbing powder material and preparation method
The invention discloses a niobium-doped barium ferrite wave-absorbing powder material, with the chemical formula of BaFe(12-x)NbxO19, wherein x is equal to 0.6-0.8, the niobium-doped barium ferrite is a single-phase polycrystalline powder body, and also contains Fe<3+> and Fe<2+>. A preparation method comprises the following steps: performing ball milling and subsequent secondary vacuum high-temperature thermal treatment by adopting a self-propagating combustion method, to obtain the niobium-doped barium ferrite wave-absorbing powder material. The wave-absorbing material has the characteristic of being thin in matching thickness and wide in wave-absorbing band, the effective wave-absorbing band is controlled within the frequency range of 23-40GHz, double-absorption peak appears, the effective absorption band width is about 15GHz, the optimal matching thickness is about 0.8mm, and the best reflection loss RL value at the specific frequency can achieve 42dB. The niobium-doped barium ferrite wave-absorbing powder material is simple in preparation method, can be used as a wave-absorbing coating, and has wide application in the electromagnetic shielding and invisibility fields.
Niobium-doped barium ferrite wave-absorbing powder material and preparation method
The invention discloses a niobium-doped barium ferrite wave-absorbing powder material, with the chemical formula of BaFe(12-x)NbxO19, wherein x is equal to 0.6-0.8, the niobium-doped barium ferrite is a single-phase polycrystalline powder body, and also contains Fe<3+> and Fe<2+>. A preparation method comprises the following steps: performing ball milling and subsequent secondary vacuum high-temperature thermal treatment by adopting a self-propagating combustion method, to obtain the niobium-doped barium ferrite wave-absorbing powder material. The wave-absorbing material has the characteristic of being thin in matching thickness and wide in wave-absorbing band, the effective wave-absorbing band is controlled within the frequency range of 23-40GHz, double-absorption peak appears, the effective absorption band width is about 15GHz, the optimal matching thickness is about 0.8mm, and the best reflection loss RL value at the specific frequency can achieve 42dB. The niobium-doped barium ferrite wave-absorbing powder material is simple in preparation method, can be used as a wave-absorbing coating, and has wide application in the electromagnetic shielding and invisibility fields.
Niobium-doped barium ferrite wave-absorbing powder material and preparation method
DU PIYI (Autor:in) / LIU CHUYANG (Autor:in) / MA NING (Autor:in) / HAN GAORONG (Autor:in) / WENG WENJIAN (Autor:in)
03.06.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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