化学共沉淀法制备FeSi@SiO2@CoFe2O4复合粉末的吸波性能

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Abstract FeSi powders were surface modified and coated with TEOS, CoCl₂∙6H₂O and FeCl₃∙6H₂O, which were used as raw materials to fabricate FeSi@SiO₂@CoFe₂O₄ composite powders by chemical co-precipitation method. The effects of calcination temperature on the coating layer structure, magnetic properties and electromagnetic wave absorption properties of composite powders were systematically investigated. The results show that with the increase of calcination temperature from 500 ℃ to 800 ℃, CoFe₂O₄@SiO₂particles evenly were covered on the surface of FeSi powders gradually gather and grow up, which lead to the destruction of the local structure of the coating. The composite powders calcined at 600 ℃ have a uniform and dense SiO₂@CoFe₂O₄ coating layer structure, high saturation magnetization (173.2 (A∙m²)/kg, high coercivity (3 047.8 A/m) and excellent electromagnetic wave absorption properties. All of the composite powders exhibit maximum reflection loss (RL_max) of (-53.5)-(-56.5) dB and effective bandwidths (RL≤-10 dB) of 4.64-5.68 GHz. Specially, the composite powders calcined at 600 ℃ achieve effective and strong absorption properties in a wide frequency band under thin thickness. They have three strong absorption peaks with the RL_maxvalues of -56.5 dB (8.76 GHz, 2.78 mm), -49.2 dB (14.00 GHz, 2.11 mm) and -40.5 dB (15.28 GHz, 1.60 mm), and wide effective bandwidths with the effective bandwidths (RL≤-10 dB) of 4.80 GHz, 6.24 GHz and 3.44 GHz, respectively. The electromagnetic wave loss mechanism of the powder is excellent impedance matching characteristics, high electromagnetic wave attenuation constant, multiple dielectric relaxation process, multiple interface polarization, high magnetic loss and dielectric loss ability.

Key words： composite powders chemical co-precipitation calcination temperature electromagnetic wave absorption property reflection loss

Received: 10 March 2021 Published: 26 September 2021

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	LAN Haixin
	CHEN Qiuli
	ZHU Shengzhi
	GAO Zhi
	LI Liya

Cite this article:

LAN Haixin,CHEN Qiuli,ZHU Shengzhi, et al. Electromagnetic wave absorption properties of FeSi@SiO₂@CoFe₂O₄ composite powders prepared by chemical co-precipitation method[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 329-337.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I4/329

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