| ZENG Guo-xun,ZHANG Hai-yan,GE Ying,CHEN Yi-ming.Fabrication and Absorption of FeCoNi Alloy Fine Powders[J],39(3):1-5,18 |
| Fabrication and Absorption of FeCoNi Alloy Fine Powders |
| Received:January 29, 2010 Revised:June 10, 2010 |
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| DOI： |
| KeyWord:ferromagnetic alloy fine powders electricmagnetic parameter reflection |
| Author | Institution |
| ZENG Guo-xun |
1.Guangdong University of Technology, Guangzhou , China;2.State Key Laboratory of Millimeter Waves, Nanjing , China |
| ZHANG Hai-yan |
1.Guangdong University of Technology, Guangzhou , China;2.State Key Laboratory of Millimeter Waves, Nanjing , China |
| GE Ying |
Guangdong University of Technology, Guangzhou , China |
| CHEN Yi-ming |
Guangdong University of Technology, Guangzhou , China |
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| Abstract: |
| Fine powders of FeCoNi with different nominal Co, Ni content were prepared by citric nitrate sol-gel method and thermal treatment in hydrogen atmosphere.The morphology and particle sizes of samples were characterized by SEM and laser particle size analyzer. The results show that FeCoNi powders have a needle-like(or flake-like)shape with a wide particle size disturbution.And the obtained powders were randomly dispersed in paraffin at a mass ratio of 80 ∶20 for microwave electromagnetic parameters test in the frequency range of 0.5～ 8 GHz. The frequencies of samples whoseμ′≥ 2 are at least 3 GHz,for certain samples even as high as 6 GHz. The imaginary parts of complex permeability of the samples exhibit several slightly damped ferromagnetic resonances. The calculation reflection losses of paraffin composites with alloy powders achieve a microwave absorption of 5 dB with a band width of 5.91 GHz(2.09～ 8 GHz) |
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