Effect of Heat Treatment Temperature on the Structure and Properties of Ultra-Soft Magnetic Fe-based Nanocrystalline Ribbons

Amorphous Fe73.5Si13.5B9Cu1Nb3 ribbons (25 μm in thickness) were produced using Chill Block Melt Spinning (CBMS) process and annealed at 400, 540, 580 and 680˚C for 60 minutes in a tube furnace under protective atmosphere. The structure and magnetic properties of the ribbons in the as-spun and annealed states were characterizedusing X-ray diffractometry, Differential Scanning Calorimetry and Hysteresisgraph. The structure of annealed ribbonsat 540 and 580°C consisted of ferromagnetic Fe3Si nanograins with a bcc crystal structure (~13 nm in diameter)surrounded by an amorphous matrix. The best soft magnetic properties (i.e. high permeability and low coercivity) were obtained from the sample annealed at 540˚C. These properties are comparable with soft magnetic properties of their foreign counterparts

کلیدواژه ها:

Nanocrystalline ، Amorphous ، FeSiBCuNb ، Soft Magnetic Materials ، Chill Block Melt Spinning