IRON-BASED AMORPHOUS ALLOY SHEET STRIP EXCELLENT IN SOFT MAGNETIC PROPERTY, AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide the iron-based amorphous alloy thin strip excellent in the soft magnetic property by proceeding the structural mitigation of the amorphous alloy sheet strip containing Fe, B, Si, Mn, Co, Ni, and Cr by the prescribed quantity at the temperature lower than the crystallization temperature by the prescribed value. ;SOLUTION: The alloy has the chemical formula indicated by Fe_xB_ySi_zM_a, where M is one or more kinds of metal to be selected among Mn, Co, Ni and Cr, and x; 77-82 (at%), y; 9-17 (at%), z; 5-14 (at%), a; 0.2-1.0 (at%). The molten alloy is rapidly solidified to form an amorphous alloy thin strip. The amorphous sheet strip is heat treated at the temperature lower than the crystallization temperature by 300-400°C for ≥6 hours. Then, the high-temperature annealing is achieved in the magnetic field according to the established method. The low-temperature heat treatment promotes the structural mitigation of the amorphous alloy sheet strip, and improves the soft magnetic property. In the relationship between the heat treatment temperature and the iron loss_13/50, the reduction effect of the iron loss is remarkably demonstrated at the temperature lower than the crystallization temperature Tx by 300-400°C.;COPYRIGHT: (C)1998,JPO