Preparation and microwave absorption properties of NdFeB alloys
来源期刊：JOURNAL OF RARE EARTHS2015年第5期
论文作者：熊吉磊 熊吉磊 成丽春 刘星 林培豪 姚青荣
文章页码：514 - 518
摘 要：In order to improve the microwave absorbing properties of Nd Fe B alloys, as-jet milled powders were further processed in a planetary mill. The phase structure, morphology and particle size of the alloy powders were investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and laser diffraction-based particle size analyzer, respectively. The saturation magnetization and electromagnetic parameters of the powders were determined by a vibrating sample magnetometer（VSM） and a vector network analyzer（VNA）, respectively. The results showed that the saturation magnetization decreased as the milling time increased. The minimum absorption peak frequency shifted towards the lower region and the reflection loss values increased with increasing the ball milling time. The minimum absorption peak value of the powders milled for 15 h on the basis of jet milling reached –44.4 d B at 11.04 GHz, and the bandwidth of R<–10 d B was 1.2 GHz with the best matching thickness of 1.8 mm.
熊吉磊1，潘顺康1，成丽春1,2，刘星3，林培豪1，姚青荣1,2
1. School of Material Science and Engineering Guilin University of Electronic Technology2. School of Materials Science and Engi-neering Central South University3. College of Chemistry and Life Sciences Hezhou University
摘 要：In order to improve the microwave absorbing properties of Nd Fe B alloys, as-jet milled powders were further processed in a planetary mill. The phase structure, morphology and particle size of the alloy powders were investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and laser diffraction-based particle size analyzer, respectively. The saturation magnetization and electromagnetic parameters of the powders were determined by a vibrating sample magnetometer（VSM） and a vector network analyzer（VNA）, respectively. The results showed that the saturation magnetization decreased as the milling time increased. The minimum absorption peak frequency shifted towards the lower region and the reflection loss values increased with increasing the ball milling time. The minimum absorption peak value of the powders milled for 15 h on the basis of jet milling reached –44.4 d B at 11.04 GHz, and the bandwidth of R<–10 d B was 1.2 GHz with the best matching thickness of 1.8 mm.
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