Ni-Mn系新高透磁率合金「Nimalloy」の特性におよぼすSb添加の影響について

Abstract

Kobayashi and two of the present authors discovered in the previous work high permeability alloys “Nimalloy” in the nickel and manganese system. Much subsequent work has been carried out on the effects of additions of various elements on characteristic properties of nickel-manganese alloys, through which the highest initial permeability of 76000 and the highest maximum permeability of 441000 have been obtained. The results obtained by antimony additions to nickel-manganese alloys show that the initial and maximum permeabilities are in general increased with increasing antimony content; the alloy containing 76.43%Ni, 16.27%Mn and 7.30%Sb exhibits the highest initial permeability of 10870 when cooled at a rate of 2800°C/hr from 900°C followed by reheating 420°C for 4.5 hr, while the alloy containing 76.17%Ni, 18.53%Mn and 5.30%Sb shows the maximum permeability of 80700 when cooled at a rate of 240°C/hr from 900°C and reheated at 460°C for 2 hr. The latter alloy shows a magnetic hysteresis loss of 45.46 erg/cm3/cycle and a coercive force of 0.0219 Oe, respectively, for the maximum magnetic induction of 5000 G, a magnetic induction of 5390 G at a field of 50 Oe and an electrical resistivity of 57.1 μΩ-cm at 20°C.