Abstract
In order to improve magnetic properties of Fe-based amorphous magnetic materials (Fe-Si-B), effects of tensile stress applied to specimens during heat treatment were studied. The heat treatments were implemented to 60 mm ×350 mm sheet samples with an electric furnace. The temperature was controlled to be a reference temperature lower enough than the crystallization temperature and the retention time was changed. The tensile stress depending on the attached weights was also changed from 9.8 MPa to 49.0 MPa per 9.8 MPa step. After and before the heat treatments under tensile stress, the magnetic properties of the samples were measured by using a single sheet tester (SST). As a result, it was found that the iron loss was decreased and the permeability was increased by the heat treatment under tensile stress. However excessive tensile stress showed weak effect on the magnetic property improvement.
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