Fe-Si-Al磁性合金の諸特性に及ぼすSiおよびAl成分の影響

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It is well known that in Si-Fe alloy, with increasing silicon contents, the coercive force becomes lower while the maximum permeability becomes higher.Alloys containing over 4% silicon, however, are very brittle and not able to be hot and cold rolled. On the other hand, Al-Fe alloys have good workability.The magnetic properties and workability of the ternary Si-Al-Fe containing Si+Al=3∼8% have been investigated.The results obtained are as follows:(1) Hot and cold workability are lowered with increasing of Si and improved by substituting aluminium for a part of silicon in Si-Fe alloy.(2) Magnetic properties of the 3Si-2Al-Fe alloy show magnetic flux density 14.4kG, coercive force 0.18Oe and maximum permeability 28500 when annealed at 900°C for 4 hours.(3) 3Si-2Al-Fe alloy is more practical for AC device than 4%Si-Fe alloy because of high electrical resistance, high magnetic flux density and good workability.
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