ＴｂＣｕ７型構造Ｓｍ‐Ｆｅ‐Ｃｏ‐Ｍｎ系窒化化合物磁石の磁気特性に及ぼすＴｉ添加の影響

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タイトル別名
  • Effect of Ti Addition on Magnetic Properties of TbCu7-type Sm-Fe-Co-Mn System Nitrides
  • TbCu7型構造Sm-Fe-Co-Mn系窒化化合物磁石の磁気特性に及ぼすTi添加の影響
  • TbCu7ガタ コウゾウ Sm Fe Co Mnケイ チッカ カゴウブツ ジシャク ノ ジキ トクセイ ニ オヨボス Ti テンカ ノ エイキョウ

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This experiment was aiming for making high performance isotropic bonded magnet. And this experiments were carried out to investigate the effect of Ti addition for magnetic properties of Sm-Fe-Co-Mn system nitriding compounds with TbCu7-type structure. Sm10(Fe0.9Co0.1)89.5-xMn0.5Tix (x = 0˜1.0) alloy ribbons were prepared by the single roller rapid-quenching method. And the effects of alloy composition, and conditions of heat-treatment and nitrogenation on the magnetic properties were examined. The optimum preparation conditions of the compounds are as follows. Composition: {Sm10(Fe0.9Co0.1)89Mn0.5Ti0.5}86.8- N13.2, roller velocity: 50 m/s, heat treatment: 700 °C×60 min in high-purity Ar gas, and nitriding condition: 420 °C×15 h in high-purity N2 gas. Typical magnetic properties of the obtained compound powders are Jr = 0.97 T, HcJ = 730.8 kA/m, (BH)max = 140.0 kJ/m3 (17.6 MGOe), and TC = 500 °C. It was found that this sample was an exchange spring magnet from XRD, TEM photograph and recoil loops of the hysteresis curve. The value of (BH)max for the isotropic compression molding bonded magnet prepared from the {Sm10(Fe0.9Co0.1)89Mn0.5Ti0.5}86.8N13.2 powder is 94.8 kJ/m3 (11.9 MGOe), when the density of bonded magnet is 6.07 Mg/m3. And the reversible temperature coefficient of Jr is α(Jr) = -0.04 %/°C, the temperature coefficient of HcJ in the range from 25 °C to 125 °C obtained by a linear extrapolation is α(HcJ) = -0.40 %/°C.

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