(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 Preparation of Anisotropic Sm-Fe-N Magnetic Powders Nitrided in (NH_3+H_2) Mixed Gas and Their Magnetic Properties
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.
粉体および粉末冶金 43(5), 624-628, 1996-05-15
Japan Society of Powder and Powder Metallurgy