耐熱性Ｐｒ‐Ｆｅ‐Ｃｏ‐Ｔｉ‐Ｙ‐Ｓｉ‐Ｂ系急冷薄帯並びにそれらのボンド磁石の磁気特性

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タイトル別名
  • Magnetic Properties of Heat Resistant Pr-Fe-Co-Ti-Y-Si-B System Melt-Spun Ribbons and their Bonded Magnets
  • 耐熱性Pr-Fe-Co-Ti-Y-Si-B系急冷薄帯並びにそれらのボンド磁石の磁気特性
  • タイネツセイ Pr Fe Co Ti Y Si Bケイ キュウレイ ハクタイ ナラビニ ソレラ ノ ボンド ジシャク ノ ジキ トクセイ

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抄録

The melt-spun ribbons of PrxFe90-x-y-zCo8Ti1.5YySi0.5Bz (x = 10.0 -13.0, y = 0.0 -1.2, z = 10.5 -14.0) alloy were prepared by signal roller liquid rapid-quenching method, and effects of composition, wheel velocity and annealing condition on the magnetic properties were studied. The optimum preparation conditions and some of the properties were as follows: Composition: Pr11Fe67.8Co8Ti1.5Y0.7Si0.5B10.5; wheel velocity: 10.0 m/s; annealing condition: 625°C for 5 min in Ar atmosphere, magnetic properties Jr = 0.77 T (7.7 kG), HcJ = 1.82 MA/m (22.9 kOe), HcB = 0.54 MA/m (6.7 kOe), (BH)max = 103.5 kJ/m3 (13.0 MGOe), Hk/HcJ × 100 = 24.0 %, α(Jr) = -0.078 %/°C, α(HcJ) = -0.420 %/°C and Tc = 380 °C. From TEM observation, average particle size of ribbon was found to be about 31 nm. The isotropic compression molding bonded magnets were prepared by using Pr11Fe67.8Co8Ti1.5Y0.7Si0.5B10.5 ribbons annealed at 625°C for 5 min. Their magnetic properties of this magnet were Jr = 0.63 T (6.3 kG), HcJ = 1.60 MA/m (20.1 kOe), HcB = 0.43 MA/m (5.4 kOe), (BH)max = 67.6 kJ/m3 (8.5 MGOe), Hk/HcJ × 100 = 19.8 %. Irreversible loss of the bonded magnet is -2.1 % at 150°C.

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