Commercial scale production of Fe-6.5 wt. % Si sheet and its magnetic properties

Abstract

Commercial scale production of a Fe-6.5 wt. % Si sheet has been successfully developed. Presently manufactured sheets are in coil form, whose thickness ranges from 0.1 to 0.5 mm with a maximum width of 400 mm. Magnetic properties of the manufactured sheet have been investigated. The permeability of Fe-6.5 wt. % Si sheet is about 10 times higher than the conventional nonoriented silicon steel sheet. The core losses are less than half the conventional, and even less than that of the grain-oriented silicon steel sheet at frequencies over 400 Hz. Superior soft magnetic properties are attributed to the low magnetostriction and high electric resistivity of this alloy. It is well known that the Fe-6.5 wt. % Si alloy has poor ductility in conventional mechanical work. But investigation of the forming conditions has enabled the stamping and bending of alloy sheets. Low core losses and high permeability make Fe-6.5 wt. % Si sheet adequate for motor cores, transformer cores operating at high frequencies, and magnetic shielding. Application to the micromotor core shows that Fe-6.5 wt. % Si sheet reduces the consumption of no-load electric current by 25% in comparison with the conventional silicon steel.

Soft Magnetic Properties of Ring-Shaped Fe-Co-B-Si-Nb Bulk Metallic Glasses

“…Table 1. The data of Fe-6.5 mass% Si steel (6.5Si) with the same thickness are also shown for comparison [14]. It should be noted that the magnetic flux density of the BMG at 800 A/m (B 800 ) is slightly larger than that of the 6.5Si.…”

FeSiBPCu Nanocrystalline Soft Magnetic Alloys with High <I>B</I><SUB>s</SUB> of 1.9 Tesla Produced by Crystallizing Hetero-Amorphous Phase

“…Comparing to the commercial non-oriented and the oriented Fe-3 mass%Si, W at B m of 1 T for the nanocrystalline alloy is much smaller than those measured by using punched ring samples for the Fe-Si alloys. 22) Although the W of the nanocrystalline and the amorphous alloys increase with increasing B m , the nanocrystalline alloy exhibits the superior W to the amorphous alloy over the whole B m range. The rapid increase of W takes place at higher B m of 1.7 T for the nanocrystalline alloy than that of 1.4 T for the amorphous alloy.…”

6.5wt% Si Electrical Sheet Produced by Laminar Composite Technique with Thermo-mechanical Process

“…Especial for 6.5wt% Si electrical steel, it exhibits excellent soft magnetic properties such as low iron loss, near-zero magneto striction and so on. In order to produce 6.5wt%Sielectrical steel and avoid rolling troubles, several approaches have been developed like chemical vapor deposition (CVD) [5] , hot dipping and diffusion annealing [2] , direct powder rolling (DPR) [6] and spray forming [7] , etc. Preparation of 6.5wt%Si electrical thin sheet by laminar composite technique and combining thermo-mechanical processes with heat treatment is reported in this research.…”