High Magnetic Permeability Alloys “Hardperm” in the Ni-Fe-Nb-W System

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  • Ni-Fe-Nb-W系高透磁率合金Hardpermについて
  • Ni Fe Nb Wケイ コウ トウジリツ ゴウキン Hardperm ニ ツ
  • High Magnetic Permeability Alloys “Hardperm” in the Ni-Fe-Nb-W System

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Abstract

Ni-Fe-Nb-W alloys were heated in hydrogen atmosphere at 1150°C for 3 hr and then cooled at vairous rates from a temperature above order-disorder transformation points. The highest values of 109000 in initial permeability and 463000 in maximum permeability are obtained for the alloy of 79.45%Ni, 11.54%Fe, 8.51%Nb and 0.50%W when cooled at the rate of 240 and 300°C/hr, respectively. The electrical resistivity of the alloy cooled at 240°C/hr is 74.6 μΩ-cm, its Vickers Hardness being 202. These high permeability Ni-Fe-Nb-W alloys show very low saturation magnetostriction constants.

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