Ni-Fe-Nb系Hardpermの特性に及ぼす板厚および熱処理の影響

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  • Influence of Sheet Thickness and Heat Treatment on the Magnetic Properties of Hardperm Alloys in the Ni-Fe-Nb System
  • Ni Fe Nbケイ Hardperm ノ トクセイ ニ オヨボス イタアツ

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Ni-Fe-Nb alloys were heated in purified H2 gas at temperatures ranging from 750 to 1150°C for 1 h. The effects of sheet thickness and heat treatment on the magnetic properties of the alloys was investigated. Increasing the heating temperature resulted in increases in initial permeability μ0 and maximum permeability μm and a decrease in coercive force Hc. In the case of thin sheet thicknesses of less than 0.05 mm, the alloys showed small values of μ0 and μm and a large value of Hc.<BR>The effective permeability μe showed a peak as a function of magnetic field H. The peak value decreased and finally disappeared with increasing frequency. The critical frequency at which the peak value disappeared increased with decrease in sheet thickness. With increasing frequency, μe at H=0.4 A/m first decreased gradually and then sharply. The frequency range where a gradual decrease in μe occurred became much wider with decreasing sheet thickness and lowering heating temperature. In the frequency range where the sharp decrease took place, however, the decrement in μe became smaller.

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