Improvement of Permeability and Magnetic Shielding Effect of Pure Iron Magnetic Shield Materials
FUJITA Koichiro INOUE Tadashi EMOTO Hideki
Abstract
Increasing demand for pure iron magnetic shield materials with an excellent magnetic shielding effect is expected in the future. Therefore, the effect of trace impurity elements on the permeability of pure iron steel sheets for magnetic shield use was investigated, and it was found that Al and S contents on the level of several 10s ppm cause remarkable deterioration of permeability. The results of an evaluation of the magnetic shielding effect using a pure iron steel sheet in which permeability was improved by high purification and precipitate morphology control confirmed that this material has an excellent magnetic shielding effect more than 3 dB higher than that of steel sheets for general forming applications.
