基于铁氧体制备的泡沫吸波材料性能

孙诗兵; 黄石明; 高乔; 田英良; 杜涛

doi:10.11936/bjutxb2016080032

基于铁氧体制备的泡沫吸波材料性能

doi: 10.11936/bjutxb2016080032

北京工业大学材料科学与工程学院, 北京 100124

基金项目: 国家科技支撑计划资助项目(2014BA15B02)

详细信息

作者简介:
作者简介: 孙诗兵(1963—), 男, 高级工程师, 主要从事外墙外保温材料、建筑围护结构材料、电磁屏蔽材料方面的研究, E-mail:sunshibing@bjut.edu.cn

中图分类号: TB34
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出版历程
- 收稿日期: 2016-08-13
- 网络出版日期: 2022-09-13
- 刊出日期: 2017-02-01

Properties of Foam Wave Absorbing Materials Prepared Based on Ferrite

College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 为了研究铁氧体的电磁性能以及铁氧体引入量的质量分数和样块厚度对材料性能的影响,以玻璃和陶瓷造粒料为基料,炭黑为发泡剂,引入铁氧体,经过球磨、烧结、发泡、退火工艺后制备出泡沫吸波材料. 结果表明:900℃处理对铁氧体的电磁性能无明显影响. 铁氧体引入量的质量分数为5%和10%的吸波性能优于铁氧体为15%和20%引入量的吸波性能;研究初步显示,该结果是由于铁氧体的引入影响多孔材料的泡孔结构. 铁氧体引入量的质量分数为10%时,材料的吸波性能随着样块厚度的增加而增大;样块厚度为50mm时,材料的有效吸收带宽(反射率小于-10dB)达18GHz,反射率低至-23.4dB.
- 泡沫材料 /
- 吸波性能 /
- 铁氧体 /
- 电磁特性
Abstract: To study the electromagnetic properties of the ferrite and the influences of the ferrite addition and the thickness of samples on the properties of the materials, foam wave absorbing materials were fabricated by introducing some ferrite and using glass and ceramic granulated material as base materials and carbon black as vesicant, with the processes of ball milling, sintering, foaming and annealing. The electromagnetic properties of ferrite had no significant change after the heat treatment at 900℃. The wave absorbing performance of materials with 5% and 10% ferrite were better than that of the materials with 15% and 20% ferrite contents, which was attributed to the fact that the incorporation of the ferrite influenced the porous structure of foam materials. Moreover, when content of ferrite was 10%, the wave absorption of the material increased with increasing samples’ thickness. The effective absorption bandwidth (reflectivity < -10dB) of 50mm thick material reached 18GHz, and its lowest reflectivity was -23.4dB.
- foam material /
- wave absorbing properties /
- ferrite /
- electromagnetic properties
The authors have declared that no competing interests exist.

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图 1 泡沫吸波材料制备工艺流程

Figure 1. Preparation process of porous materials of wave absorption

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图 2 室温下铁氧体的电磁参数与频率的关系

Figure 2. Relations between ferrite electromagnetic parameters and frequency at room temperature

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图 3 高温处理后铁氧体的电磁性能

Figure 3. Electromagnetic properties of ferrite after high temperature treatment

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图 4 铁氧体引入量的质量分数对电磁波反射率的影响

Figure 4. Effect of ferrite contents on the wave absorption properties

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图 5 不同铁氧体引入量的质量分数的材料泡孔状态

Figure 5. Material cell state of different ferrite contents

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图 6 炭黑的介电损耗角正切和磁损耗角正切

Figure 6. Loss tangent of dielectric and magnetic of carbon black

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图 7 试件厚度与材料电磁波反射率的关系

Figure 7. Relations between samples thickness and reflectivity of electromagnetic wave

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图 8 铁氧体引入量的质量分数对力学强度的影响

Figure 8. Effect of the ferrite contents on materials mechanical strength

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图 9 铁氧体引入量的质量分数对密度的影响

Figure 9. Effect of the ferrite contents on density of material

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表 1 陶瓷造粒料的化学成分

Table 1. Chemical composition of the ceramic granulated materials%

成分	SiO₂	Al₂O₃	K₂O	BaO	SrO	ZrO₂	Co₂O₃	PbO	Rb₂O	ZnO
质量分数	66.34	23.21	3.04	0.13	0.11	0.05	0.02	0.02	0.01	0.01

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表 2 玻璃粉的化学成分

Table 2. Chemical composition of glass powder%

成分	SiO₂	Na₂O	CaO	MgO	Al₂O₃	K₂O	SO₃	Fe₂O₃	TiO₂	ZrO₂
质量分数	69.91	13.48	10.53	4.26	0.97	0.39	0.25	0.12	0.04	0.04

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