Heat treatment of iron-nickel-phosphorus-boron glassy metal alloys

摘要

A process is provided for improving magnetic properties of certain glassy metal alloys which comprises immersing toroidally wound cores of glassy metal alloy filaments in a thermally stable, nonferromagnetic, electrically inert and chemically unreactive liquid, maintaining the liquid at a temperature of between about 310 DEG and 350 DEG C for about 3/4 to 8 hrs., depending on the temperature selected, and cooling the filament to about 25 DEG C at a rate not greater than about 30 DEG C/min. through its Curie temperature. Optionally, a magnetic field of about 1 to 10 Oe may be applied circumferentially around the cores during cooling through the Curie temperature to further improve the magnetic properties of the glassy metal alloy.