The silicon steel plate is widely used as core materials of various devices such as a transformer and an electromotor. However, in order to solve the energy problem, it is very important to develop soft magnetic materials with less iron loss.
Fe-based amorphous and nano-crystalline alloys are widely used because of its low cost and iron loss about one fifth to one third of silicon steel plates. But, they are restricted to some degree in application because the value of maximum flux density of these materials is about 80% of silicon steel plates. Therefore, researches to develop soft magnetic materials with higher maximum flux density and lower core loss have been performed. As a result, new Fe-based nano-crystal soft magnetic materials have been developed. Among them, Fe-Cu-B system nano-crystalline soft magnetic materials are attracting a great deal of attention.
In most studies, the experimental results of the influence of copper, silicon and boron on the magnetic properties were analyzed, but the thermodynamic changing process was not described in detail.
Jo Chol Min, a researcher at the Faculty of Materials Science and Technology, has conducted a study to thermodynamically solve the influence of Cu addition on the crystallization of the Fe-based nano-crystalline soft magnetic alloy fabricated by the melt spinning method. In addition, he has analyzed the influence of silicon and boron on the magnetic properties of Fe-based nano-crystalline soft magnetic alloys to determine the reasonable composite.
He found that the crystallization activation energy of Fe-based alloys containing copper was lower than copper-free alloys, which indicates that copper is effective to accelerate the crystallization of alloys and increase the magnetic property. He also demonstrated that in crystallization heat treatment, the maximum flux density and coercive force of the Fe-based nano-crystalline soft magnetic alloy containing copper were the best with 2% of Si.
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