Process for manufacturing a magnetic component made of an iron- based soft magnetic alloy having a nanocrystalline structure

摘要

Process for manufacturing a magnetic component made of an iron- based soft magnetic alloy having a nanocrystalline structure, the chemical composition of which is, in at. %, Fe≧60%, 0.1%≦ Cu≦ 3%, 0%≦B≦25%, 0%≦Si≦30%, and at least one element selected from niobium, tungsten, tantalum, zirconium, hafnium, titanium and molybdenum with contents of between 0.1% and 30%, the balance being impurities resulting from the smelting, the composition furthermore satisfying the relationship 5%≦Si+B. ltoreq.30%, according to which an amorphous ribbon is manufactured from the magnetic alloy, a blank for a magnetic component is manufactured from the ribbon and the magnetic component is subjected to a crystallization heat treatment comprising at least one annealing step at a temperature of between 500° C. and 600° C. for a temperature hold time of between 0.1 and 10 hours so as to cause nanocrystals to form; before the crystallization heat treatment, a relaxation heat treatment is carried out at a temperature below the temperature for the onset of recrystallization of the amorphous alloy.