Effect of Addition of Molybdenum on Chracteristic Properties of New High-Magnetic Permeability Alloys “Nimalloy” in the System of Nickel and Manganese

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  • Masumoto Hakaru
    The Foundation: The Research Institute of Electrical and Magnetic Alloys
  • Kobayashi Takeo
    The Foundation: The Research Institute of Electrical and Magnetic Alloys
  • Murakami Yûetsu
    The Foundation: The Research Institute of Electrical and Magnetic Alloys

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Other Title
  • Ni-Mn系新高透磁率合金「Nimalloy」の特性におよぼすMo添加の影響について
  • Ni-Mnケイ シン コウトウジリツ ゴウキン Nimalloy ノ トクセイ ニ オヨボス Mo テンカ ノ エイキョウ ニ ツイテ
  • Effect of Addition of Molybdenum on Chracteristic Properties of New High-Magnetic Permeability Alloys “Nimalloy” in the System of Nickel and Manganese

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Following the discovery of high magnetic permeability alloys “Nimalloy”, the authors have carried out a series of experiments on the effects of additions of various elements on the properties of Nimalloy and obtained the highest initial permeability of 76000 and the highest maximum permeability of 441000. The results showed that with increasing addition of Mo to Ni-Mn binary alloys, the cooling rate required to attain the highest permeability became smaller. Accordingly, most of the alloys was baked for a long time at a temperature below the order-disorder transformation point after slow-cooling from 900°C. In the case of Mo additions, both the initial and maximum permeabilities increased gradually to maxima and then decreased gradually. The nickel alloy containing 18.63%Mn and 3.70%Mo showed the highest initial permeability of 13720 and the highest maximum permeability of 113400 when baked at 400°C for 340 and 210 hr after cooling at 5°C/hr from 900°C respectively. The alloy of the highest maximum permeability showed a coercive force of 0.0240 Oe and a hysteresis loss of 36.24 erg/cm3/cycle for the maximum magnetic induction of 5000 G, an intrinsic magnetic induction of 8010 G at 900 Oe and an electrical resistivity of 58.8 μΩ-cm at 20°C.

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