Research on microwave electromagnetic properties of Tb-Fe-Cr alloy
来源期刊：JOURNAL OF RARE EARTHS2011年第10期
论文作者：王啸坤 潘顺康 周怀营 杨涛 林培豪 于杰
文章页码：946 - 950
摘 要：The Tb-Fe-Cr alloy powders were prepared by the arc melting method and high energy ball milling.The phase structure and themicrostructure of the alloys powders were analyzed by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,and then their microwave absorbing properties were analyzed by Vector network analyzer.The results showed that the absorption peak values of Tb9Fe88Cr3alloy with a material thickness of 2.0 mm were lower than-16.5 dB when ball milling time was from 50 to 60 h,and the wide frequency ofreflectivity under-10 dB were all more than 4 GHz.When the ball milling time was 50 h,the alloy powders had better electromagnetic properties.The absorption peak value of alloy reached-25.8 dB,and the wide frequency of reflectivity under-10 dB reached 4.8 GHz.When theball milling time was more than 70 h,the alloy powders would become thinner,leading to worse electromagnetic properties of the alloy,theabsorption peak shifted towards low frequency under the same material thickness.The TbxFe97-xCr3（x=7,9,11,13,15 mol.%） alloy dealtwith 60 h ball milling time had better wide-frequency characteristic under 1.8 mm of material thickness.The absorption peak shifted towardshigher frequency region from lower frequency region with increased atom percent of Tb in the alloy,and the inflexion point appeared whenx=13.At low frequency,the microwave absorbing properties of Tb11Fe86Cr3 alloy was better than those of the others.The absorption peakvalue of Tb15Fe82Cr3 alloy was-24 dB,and the wide frequency of reflectivity under-10 dB was 4.5 GHz.
王啸坤，潘顺康，周怀营，杨涛，林培豪，于杰
Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology
摘 要：The Tb-Fe-Cr alloy powders were prepared by the arc melting method and high energy ball milling.The phase structure and themicrostructure of the alloys powders were analyzed by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,and then their microwave absorbing properties were analyzed by Vector network analyzer.The results showed that the absorption peak values of Tb9Fe88Cr3alloy with a material thickness of 2.0 mm were lower than-16.5 dB when ball milling time was from 50 to 60 h,and the wide frequency ofreflectivity under-10 dB were all more than 4 GHz.When the ball milling time was 50 h,the alloy powders had better electromagnetic properties.The absorption peak value of alloy reached-25.8 dB,and the wide frequency of reflectivity under-10 dB reached 4.8 GHz.When theball milling time was more than 70 h,the alloy powders would become thinner,leading to worse electromagnetic properties of the alloy,theabsorption peak shifted towards low frequency under the same material thickness.The TbxFe97-xCr3（x=7,9,11,13,15 mol.%） alloy dealtwith 60 h ball milling time had better wide-frequency characteristic under 1.8 mm of material thickness.The absorption peak shifted towardshigher frequency region from lower frequency region with increased atom percent of Tb in the alloy,and the inflexion point appeared whenx=13.At low frequency,the microwave absorbing properties of Tb11Fe86Cr3 alloy was better than those of the others.The absorption peakvalue of Tb15Fe82Cr3 alloy was-24 dB,and the wide frequency of reflectivity under-10 dB was 4.5 GHz.
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