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Niobium-nickel co-doped barium ferrite wave-absorbing powder material and preparation method thereof
The invention discloses a niobium-nickel co-doped barium ferrite wave-absorbing powder material. The material refers to single-phase polycrystalline powder and has the chemical formula of BaFe12-2xNbxNixO19, wherein x is equal to 0.4-0.6, and Fe<3+> and Fe<2+> simultaneously exist in the barium ferrite. The method for preparing the material mainly comprises the following steps: adopting a self-propagating combustion method, combining ball-milling and a subsequent secondary high temperature heat treatment process, thereby obtaining the niobium-nickel co-doped barium ferrite wave-absorbing powder material. The wave-absorbing material disclosed by the invention has the characteristics of wide wave-absorbing frequency band and wide wave-absorbing frequency modulation range, the effective wave-absorbing frequency band is controlled to be in a frequency range of 18-40GHz, double absorption peaks occur, the effective absorption bandwidth is about 12GHz, and the optimal reflection loss RL value at the specific frequency is -45dB. The barium ferrite powder material is simple in preparation process, can be used for a wave-absorbing coating and can be widely applied to the fields of electromagnetic shielding and stealth.
Niobium-nickel co-doped barium ferrite wave-absorbing powder material and preparation method thereof
The invention discloses a niobium-nickel co-doped barium ferrite wave-absorbing powder material. The material refers to single-phase polycrystalline powder and has the chemical formula of BaFe12-2xNbxNixO19, wherein x is equal to 0.4-0.6, and Fe<3+> and Fe<2+> simultaneously exist in the barium ferrite. The method for preparing the material mainly comprises the following steps: adopting a self-propagating combustion method, combining ball-milling and a subsequent secondary high temperature heat treatment process, thereby obtaining the niobium-nickel co-doped barium ferrite wave-absorbing powder material. The wave-absorbing material disclosed by the invention has the characteristics of wide wave-absorbing frequency band and wide wave-absorbing frequency modulation range, the effective wave-absorbing frequency band is controlled to be in a frequency range of 18-40GHz, double absorption peaks occur, the effective absorption bandwidth is about 12GHz, and the optimal reflection loss RL value at the specific frequency is -45dB. The barium ferrite powder material is simple in preparation process, can be used for a wave-absorbing coating and can be widely applied to the fields of electromagnetic shielding and stealth.
Niobium-nickel co-doped barium ferrite wave-absorbing powder material and preparation method thereof
DU PIYI (Autor:in) / LIU CHUYANG (Autor:in) / MA NING (Autor:in) / HAN GAORONG (Autor:in) / WENG WENJIAN (Autor:in)
20.05.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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