Fe-based Amorphous Ribbons Research Articles

Improved coating for amorphous alloy with low loss deterioration

Insulation coating for Fe-based amorphous ribbon was studied with emphasis on loss deterioration and interlayer insulation resistivity. An aluminum oxide coating was prepared by the solution anodic deposition process so that the coating thickness could be controlled in a range that did not decrease the packing factor. Even thin aluminum oxide coatings were found to have a high resistivity. Additional coating of one or more inorganic substances on the aluminum oxide results in low loss deterioration both in straight ribbon and toroidal cores. Magnetic domain observation reveals that stress induced by the aluminum oxide coating is relieved by the additional coating, which also enhances the corrosion resistance in a moist atmosphere.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

鉄系非晶質薄帯の渦電流損失に及ぼす非正弦的局部磁束変化の効果

鉄系非晶質薄帯の渦電流損失に及ぼす非正弦的局部磁束変化の効果

The Variation of Magnetic Properties of Fe-Based Amorphous Alloys Along the Ribbon Length

ABSTRACTThe variation of ac magnetic properties along the length of melt-spun Fe-based amorphous ribbons was examined in relation to the variations of the roller surface temperature and the ribbon thickness. The results indicated that the lengthwise variation of magnetic properties strongly depends both on the roller surface temperature and the ribbon thickness. The critical cooling rates at which core loss begins to increase were determined from the relationship between core loss and cooling rate. For ribbons cast at lower cooling rate than critical cooling rate, the finedomain patterns were usually observed on the free surface. From the disappearance of the fine-domain pattern and the remarkable decrease of core loss by removal of the surface layers, it is ascertained that the surface layers deteriorate magnetic properties.