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《Surface Technology》 2010-03
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Fabrication and Absorption of FeCoNi Alloy Fine Powders

ZENG Guo-xun1,2,ZHANG Hai-yan1,2,GE Ying1,CHEN Yi-ming1(1.Guangdong University of Technology,Guangzhou 510006,China;2.State Key Laboratory of Millimeter Waves,Nanjing 210096,China)  
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 whose μ′≥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).
【Fund】: 国家自然科学基金对外交流与合作项目(2006国科金工外资助字第50610105054);; 高等学校博士学科点专项科研基金(20050562002);; 广东省自然科学基金(036918);; 粤港关键领域重点突破招标项目(20061683);; 毫米波国家重点实验室开放课题(K200921)
【CateGory Index】: TB383.3
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