(NH_3+H_2)混合ガスによる異方性Sm-Fe-N系磁石の作製およびその磁気特性 [in Japanese] Preparation of Anisotropic Sm-Fe-N Magnetic Powders Nitrided in (NH_3+H_2) Mixed Gas and Their Magnetic Properties [in Japanese]
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Using two kinds of Sm<SUB>2</SUB>(Fe, Mn)<SUB>17</SUB> powders whose grain sizes are 32-74 μm and 74-100 μm, the nitriding behaviour of Sm<SUB>2</SUB>(Fe, Mn)<SUB>17</SUB> in a mixed-gas atmosphere of ( NH<SUB>3</SUB>+H<SUB>2</SUB>) and their magnetic properties have been investigated . Sm<SUB>2</SUB>(Fe, Mn)<SUB>17</SUB>N<SUB>x</SUB>specimens with 0<X<6 were fabricated in both of the above mentioned two cases . Though the coercivity increased with increasing X, the saturation of magnetization tended to decrease with increasing X in both of two specimens . The (BH)<SUB>max</SUB> was highest at X=4.8 in case of the specimen using 32-74 μm powder, and at X=4.3 in case of the specimen using 74-100 μm powder ; the value of (BH)<SUB>max</SUB> was 85.20kJ/m<SUP>3</SUP> in the former and 63.05kJ/m<SUP>3</SUP> in the latter. The magnetic anisotropy was also recognized in both of the two specimens. These magnetic properties were confirmed to be related to the grain refinement observed during nitriding process.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 43(5), 624-628, 1996-05-15
Japan Society of Powder and Powder Metallurgy