ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A hard and brittle Senperm alloy, which is of superior constant permeability, was formed into ribbon shape using a rapid quenching single-roller method. We already reported that the constancy of permeability and mechanical workability were fairly improved on the obtained Senperm ribbon. Yamamoto reported that the constancy of permeability and maximum permeability increased notably and a sharp rectangle hysteresis loop was observed on the alloy after annealing at 750 °C in a magnetic field around 15 Oe. In the present study, the Senperm ribbon was annealed at 900 °C for 7 h in vacuum, followed by reannealing in a magnetic field less than its coercive force. The investigated ribbon has nominal compositions of 16.2 wt. % Ni-10.8 wt. % Si-Fe. The obtained ribbons dimensions are approximately 55 μm thick, 1.5 mm wide and several meters long. The initial permeability and the range of constant permeability after reannealing at 300 °C for 30 min in 0.1-Oe field are slightly improved, whereas they decrease when the reannealing time is lengthened or the magnetic field is increased. The maximum flux density B10 obtained after field reannealing over its Curie point of 548 °C is larger by 5–12% than that obtained prior to reannealing, though it decreases by 10–5% after reannealing at 300 °C. After field reannealing for 10 min at various temperature, the coercive force decreases to one fourth the value obtained prior to field reannealing. An excellent rectangular hysteresis loop is observed on the ribbon annealed at 300 °C for 1 h in a magnetic field of 1.5 Oe. The rectangularity is as much as 98% which is slightly higher than that of Permalloy. The experimental results might indicate the promising usefulness for application of the rapidly quenched Senperm ribbon (e.g., such as high-frequency transformer cores, high-grade magnetic recording head materials, or magnetic amplifier cores).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.334577
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