| 摘要 |
PURPOSE:To prevent the deterioration in the magnetic characteristics such as iron loss by annealing the alumina insulating film-coated thin band iron-based amorphous alloy in an atmosphere mixed with oxygen. CONSTITUTION:The melt of the iron-based alloy having a specified composition is quenched by the single roll method, etc., and solidified to obtain a thin band amorphous alloy. An aq. processing soln. consisting essentially of colloidal hydrated alumina is applied on the band alloy, and then baked at a relatively low temp. The obtained alumina insulating film-coated band alloy is annealed in an atmosphere mixed with oxygen. Air, oxygen, a gaseous mixture of oxygen and an inert gas, etc., are appropriately used as the annealing atmosphere. The oxygen in the atmosphere forms a solid film on the surface of the alloy layer to prevent the crystallization of the alpha-Fe surface, and the deterioration in the iron loss characteristic is advantageously prevented. An Fe-B-Si based alloy consisting of 7-16 atom% B, 4-14 atom% Si, and the balance Fe or an Fe-(Mn,Ni)-B-Si based alloy further contg. 0.5-10% one or two kinds between Mn and Ni is appropriately used as the iron-based alloy. |
