Fe-based initial-ultra-fine-crystal-alloy ribbon and magnetic component
A technology of ultra-fine crystals and thin strips, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of low toughness, high volume ratio of fine crystal grains, fracture, etc., and achieve the effect of high productivity
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Embodiment 1
[0062] The single-roll casting method with the following conditions has Fe 75.7-x Ni x Cu 0.8 Nb 2.8 Si 10.9 B 9.8 The Fe-based initial ultrafine crystalline alloy ribbon with a width of 53 mm, a thickness of 10 to 24 μm, and a length of 5000 m was peeled from the cooling roll by a nitrogen stream (air knife) and wound on the roll.
[0063] Gap between nozzle and cooling roll: 250μm
[0064] The width of the nozzle gap: 0.45mm
[0065] The spray pressure of the melt: 280g / cm 2
[0066] The peripheral speed of the cooling roll: 30m / s
[0067] When the thickness is 10 μm, breakage frequently occurs due to tensile stress during winding on a roll, and a long alloy ribbon cannot be obtained. Therefore, the experiment of slitting processing cannot be performed.
[0068] For each Fe-based initial ultrafine crystalline alloy ribbon 1 with a thickness of 10-24μm, such as figure 1 As shown, the slitting process is performed using three disc-shaped grinding wheels 2a, 2b, and 2c rotating at subs...
Embodiment 2
[0078] In Example 1, in the alloy thin strip with a width of 25mm, the Ni content of 4.0 at%, 4.5 at%, 5.0 at%, 5.3 at% and 6.0 at%, and a thickness of 16μm were wound into A ring shape with an outer diameter of 24.5 mm and an inner diameter of 21 mm was made into a magnetic core. Keep each core in a nitrogen atmosphere at 550°C for 20 minutes, and heat-treat it in a 319.1kA / m (4000 Gauss) magnetic field to generate nanocrystalline grains with an average particle size of 20-100nm in the alloy ribbon, and obtain Fe-based nanocrystals Toroid core made of soft magnetic alloy thin strip. The observation result of the transmission electron microscope photograph (1000nm×1000nm field of view) is that the nanocrystal grains in each alloy ribbon are roughly spherical, with an average particle size of 20-100nm, and the volume ratio to the whole structure is 60~ 80%.
[0079] One turn of a coated copper wire with a diameter of 0.5 mm was wound around each toroidal core, the inductance was...
Embodiment 3
[0081] In Example 1, a thin alloy ribbon having a width of 25 mm was slit and processed, and a material with a Ni content of 5.0 atomic% and a thickness of 16 μm was wound into a circular ring shape with an outer diameter of 150 mm and an inner diameter of 100 mm to obtain a magnetic core. A copper wire is wound around the toroidal core to produce a common mode choke coil. This common mode choke coil was incorporated into an inverter circuit for electric vehicles, and as a result, the noise removal effect was confirmed.
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