熱間加工による異方性Ｄｉｄｙｍｉｕｍ－Ｆｅ－Ｃｏ－Ｎｂ－Ｖ－Ｙ－Ｂ系磁石の磁気特性

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  • Magnetic Properties of Anisotropic Didymium-Fe-Co-Nb-V-Y-B Magnets by using Hot-Forming Process
  • ネツカン カコウ ニ ヨル イホウセイ Didymium Fe Co Nb V Y Bケイ ジシャク ノ ジキ トクセイ

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The experiment was aiming for making anisotropic magnet by using hot-forming process. And this experiment was carried out to investigate the effects of Cu addition, and hot-forming temperature on magnetic properties of Didymium-Fe-Co-Nb-Y-B and Didymium-Fe-Co-Nb-V-Y-B alloys. The results are summarized as follows:1) In the X-ray diffraction patterns which were taken in the direction of applied compressive stress in the hot-forming process, large peaks corresponding to (004), (105) and (006) planes were observed. These planes are facing the direction of the c-axis of the Nd2Fe14B-type crystal. These observations suggest that crystallites are oriented toward the c-axis by the hot-forming process.2) The optimized preparatory conditions for the anisotropic magnet Di12.5Fe68.3Co10Nb1V1Y0.7Cu0.5B6 are as follows: roller velocity in the process of preparing the melt-spun ribbons : 25 m/s, and temperature of the hot-forming process: 840°C. Typical magnetic properties of the anisotropic magnets obtained: Jr=1.041T, HcJ=812.5 kA/m, HcB=561.7 kA/m, (BH)max=176.8 kJ/m3, (Jr - Jr')/Jr × 100 =54.5 %. The α-Fe type phase is contained several percent in the sample. Good results are obtained in this study, which can be related to the industrial “die-upset process”.

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