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粉末冶金材料科学与工程 >

2024 , Vol. 29 >Issue 4: 330 - 340

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2024049

工艺技术

磁性金属钴/碳微波吸收剂粉末的制备和性能

  • 李子琦 ,
  • 丁学科 ,
  • 陈传盛
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  • 1.长沙理工大学 材料科学与工程学院,长沙 410114;
    2.浙江波誓盾科技有限公司,余姚 315400

收稿日期: 2024-05-12

  修回日期: 2024-07-03

  网络出版日期: 2024-09-30

基金资助

湖南省自然科学基金资助项目(2021JJ50016); 湖南省教育厅科学研究基金资助项目(20A015)

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Preparation and properties of magnetic metal cobalt/carbon microwave absorber powders

  • LI Ziqi ,
  • DING Xueke ,
  • CHEN Chuansheng
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  • 1. College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China;
    2. Zhejiang Boshidun Technology Co., Ltd., Yuyao 315400, China

Received date: 2024-05-12

  Revised date: 2024-07-03

  Online published: 2024-09-30

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摘要

为克服磁性金属密度大、磁损耗模式单一等不足,分别以Co盐和均苯三甲酸为原料和有机配体,利用沉淀法制备Co基金属有机框架,通过煅烧处理合成磁性金属Co/C复合微波吸收剂粉末,研究煅烧温度对Co/C微波吸收剂形貌和微波吸收性能的影响。结果表明：煅烧温度对Co/C微波吸收剂的形貌和性能有很大影响,经过500 ℃和600 ℃煅烧分别获得分散均匀的颗粒结构和多孔骨架结构,700 ℃和800 ℃煅烧获得链式棒状结构。800 ℃煅烧的样品表现出最佳电磁波吸收性能,当测试样品厚度为4.5 mm时,其在13.76 GHz处的最大反射损耗和有效吸收带宽分别达到-35 dB和0.56 GHz。微波吸收性能的提高归因于多重损耗机制(涡流和交换共振等),适宜的电磁参数和衰减常数,以及多孔结构与多种组分之间的协同效应。

关键词： 微波吸收剂; 金属有机框架; 磁性金属; Co金属; 碳化

本文引用格式

李子琦 , 丁学科 , 陈传盛 . 磁性金属钴/碳微波吸收剂粉末的制备和性能[J]. 粉末冶金材料科学与工程, 2024 , 29(4) : 330 -340 . DOI: 10.19976/j.cnki.43-1448/TF.2024049

Abstract

To overcome the drawbacks of high density and single-mode magnetic loss in magnetic metals, Co-based metal organic frameworks were prepared by precipitation method using Co salt and trimesic acid as raw material and organic ligand, respectively. Magnetic metal Co/C composite microwave absorber powders were synthesized through calcination, and the effects of calcination temperature on the morphology and microwave absorption properties of Co/C microwave absorbers were studied. The results show that calcination temperature significantly affect the morphology and properties of Co/C absorbers, uniformly dispersed particle structure and porous framework structures can be obtained after calcination at 500 ℃ and 600 ℃, respectively, while chain-like rod structures can be obtained at 700 ℃ and 800 ℃. The sample calcined at 800 ℃ exhibits the best electromagnetic wave absorption property, with a maximum reflection loss of -35 dB and an effective absorption bandwidth of 0.56 GHz at 13.76 GHz when the tested sample thickness is 4.5 mm. The improvement in microwave absorption property is attributed to multiple loss mechanisms (such as eddy current and exchange resonance), suitable electromagnetic parameters and attenuation constant, and the synergistic effect between the porous structure and various components.

Key words： microwave absorber; metal organic framework; magnetic metal; metal Co; carbonization

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