Effect of rare earths on microwave absorbing properties of RE-Co alloys

The powders of RE2Co17（RE=Y, Ce, Nd, Ho, Er） and Ho x Co100–x（x=6, 8, 10, 12） alloys were prepared by the arc melting method and high-energy ball mill process. The compositions and morphologies of the alloys were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）, and the...

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Bibliographic Details
Published inJournal of rare earths Vol. 33; no. 3; pp. 271 - 276
Main Author 何崇康 潘顺康 成丽春 刘星 吴亚军
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2015
Subjects
Absorption
Alloys
high energy ball milling
Ho content
microwave absorbing properties
Microwaves
Networks
Noise levels
Peak frequency
Rare earth metals
rare earths
RE2Co17 alloy
Reflectivity
Scanning electron microscopy
X射线衍射
低反射率
低频率
微波吸收性能
扫描电子显微镜
矢量网络分析仪
稀土
钴合金
Ho content
high energy ball milling
RE2Co17 alloy
microwave absorbing properties
rare earths
Online AccessGet full text
ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(14)60414-2

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Summary:The powders of RE2Co17（RE=Y, Ce, Nd, Ho, Er） and Ho x Co100–x（x=6, 8, 10, 12） alloys were prepared by the arc melting method and high-energy ball mill process. The compositions and morphologies of the alloys were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）, and the microwave absorbing properties were studied by a vector network analyzer. The results showed that the alloy of Y2Co17 had better absorbing properties at low frequencies and its lowest reflectivity value was –9.5 d B at 3.8 GHz. The lowest reflectivity value of Ho2Co17 alloy was –13.7 d B at 7.02 GHz and it obtained large absorbing bandwidth. Reflectivity value less than –5 d B was from 5.1 to 10.2 GHz. When x=6 and x=8, the alloys of Ho x Co100–x consisted of Ho2Co17 phase and Co phase. They had good radar absorbing properties. With increase in Ho content, the minimum reflectivity value worsened and the absorbing peak frequency shifted toward higher frequencies. But when x=12, the absorbing peak frequency shifted toward lower frequencies but the minimum reflectivity value worsened.
Bibliography:The powders of RE2Co17（RE=Y, Ce, Nd, Ho, Er） and Ho x Co100–x（x=6, 8, 10, 12） alloys were prepared by the arc melting method and high-energy ball mill process. The compositions and morphologies of the alloys were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）, and the microwave absorbing properties were studied by a vector network analyzer. The results showed that the alloy of Y2Co17 had better absorbing properties at low frequencies and its lowest reflectivity value was –9.5 d B at 3.8 GHz. The lowest reflectivity value of Ho2Co17 alloy was –13.7 d B at 7.02 GHz and it obtained large absorbing bandwidth. Reflectivity value less than –5 d B was from 5.1 to 10.2 GHz. When x=6 and x=8, the alloys of Ho x Co100–x consisted of Ho2Co17 phase and Co phase. They had good radar absorbing properties. With increase in Ho content, the minimum reflectivity value worsened and the absorbing peak frequency shifted toward higher frequencies. But when x=12, the absorbing peak frequency shifted toward lower frequencies but the minimum reflectivity value worsened.
11-2788/TF
RE2Co17 alloy microwave absorbing properties high energy ball milling Ho content rare earths
HE Chongkang , PAN Shunkang , CHENG Lichtm , LIU Xing , WU Yajun （1. School of Materials Science and Engineering, GuiBn University of Electronic Technology, Guilin 541004, China; 2. Hezhou Science and Technology Bureau, Hezhou 542899, China; 3. School of Materials Science and Engineering, Central South University, Changsha 410012, China）
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60414-2