Electromagnetic Microwave Absorption of α-Fe Microstructure Produced by Disproportionation Reaction of Sm 2 Fe 7 Compound
Electromagnetic Microwave Absorption of α-Fe Microstructure Produced by Disproportionation Reaction of Sm 2 Fe 7 Compound
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Sm 2 Fe 7 化合物歧化反应产生的α-Fe微结构的电磁微波吸收
DOI：
10.2320/matertrans1989.41.1172
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Y. Houjou
中科院分区：
文献类型：
--
作者：
T. Maeda;S. Sugimoto;T. Kagotani;D. Book;M. Homma;H. Ota;Y. Houjou
研究了由Sm 2Fe 17沉淀法制备的α-Fe结构磁粉在GHz频段的电磁波吸收性能。Sm 2Fe 17化合物在氢气氛中分解后形成了亚微米级的α-Fe/SmH 2结构。用X射线衍射谱线展宽分析法计算出α-Fe相的晶粒尺寸约为30 nm。通过这种方法，获得了具有α-Fe线状结构的磁粉。然后在空气中加热氧化SmH 2，得到α-Fe/SmO两相组织。用该粉末制备了环形环氧树脂复合材料，并测试了这些样品的微波吸收性能。结果表明，经纯化的样品（在氢气中于873 K加热1小时，研磨30分钟，在空气中于473 K氧化2小时）表现出电磁波吸收（R.L. < -20 dB），吸收体厚度为12.5 ~ 7.5 mm。未纯化的样品在该频率范围内未显示出任何电磁波吸收。
The electromagnetic wave absorption properties of a magnetic powder with a fine α-Fe structure, produced by the disproportionation of Sm 2 Fe 17 , were investigated in the GHz frequency range. A fine, sub-micrometre α-Fe/SmH 2 structure was formed from the Sm 2 Fe 17 compound after disproportionation in a hydrogen atmosphere. The grain size of the α-Fe phase was calculated by X-ray diffraction line broadening analysis, to he about 30nm. In this way, a magnetic powder with a line structure of α-Fe was obtained. This powder was then heated in air in order to oxidize the SmH 2 , with the result that an α-Fe/SmO two-phase microstructure was obtained. Toroidally shaped epoxyresin composites were made from this powder, and the microwave absorption properties of these samples were measured. As a result, the disproportionated samples (heated in hydrogen at 873 K for 1 hour, milled for 30 minutes and oxidized at 473 K for 2 hours in the air) exhibited electromagnetic wave absorption (R.L. < -20 dB) in the frequency range 0.75 to 1.3 GHz, for absorber thicknesses ranging from 12.5 to 7.5 mm, respectively. An undisproportionated sample did not show any electromagnetic wave absorption in this frequency range.