EVOLUTION OF MAGNETOMECHANICAL DAMPING AND MAGNETIC-PROPERTIES OF PURE IRON SILICONIZED UP TO 5.5-WT-PERCENT BY CHEMICAL-VAPOR-DEPOSITION

With a high silicon content, silicon steel has good soft magnetic prop erties because of the decreased magnetic anisotropy, lower magnetostri ction and higher resistivity. However, above 3.5 wt.% Si a lower ducti lity makes conventional processing into textured strips extremely diff icult. In this investigation we consider another possible method which consists of depositing silicon and aluminium on a pure iron substrate by chemical vapour deposition. The magnetomechanical damping evolutio n (measured at 0.7 Hz with a torsional pendulum) of enriched iron stri ps containing between 0.5 and 5.5 wt.% Si + Al is considered. Results show a strong decrease in magnetomechanical damping with increasing Si + Al content, which coexists with a lowering of the magnetic core los ses measured at 50 and 400 Hz. Results relative to as-prepared and hom ogenized states are compared.