Method for manufacturing Fe-based nanocrystalline alloy strip, method for manufacturing magnetic core, Fe-based nanocrystalline alloy strip, and magnetic core
A technology of nanocrystalline alloys and base alloys, applied in the direction of magnetic core/yoke, transformer/inductor magnetic core, magnetic materials, etc., can solve the problems of reduced insulation and no insulation layer formed
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[0054] [Preparation method of Fe-based nanocrystalline alloy ribbon]
[0055] The preparation method of the Fe-based nanocrystalline alloy thin strip of the present disclosure (hereinafter also referred to as "the preparation method of the Fe-based nanocrystalline alloy thin strip of the present disclosure") includes the following steps:
[0056] Fe-based alloy molten liquid is supplied to a rotating cooling roll, so that the Fe-based alloy molten liquid supplied to the cooling roll is rapidly condensed and solidified, thereby obtaining a free solidification surface and a roll contact surface with a width of 5 mm to 65 mm. , a step of Fe-based amorphous alloy thin strip with a thickness of 10 μm or more and 15 μm or less, and
[0057] heat-treating the Fe-based amorphous alloy ribbon to obtain a Fe-based nanocrystalline alloy ribbon;
[0058] Wherein, the outer peripheral portion of the cooling roll is made of Cu alloy, and the thermal conductivity of the outer peripheral por...
Embodiment 1
[0241] -Preparation (Casting) of Fe-based Amorphous Alloy Ribbon-
[0242] will have Fe bal. Cu 0.98 Si 14.99 B 6.68 Nb 2.89 C 0.05The Fe-based alloy molten liquid (9.1kg) of the alloy composition represented by (atomic %) is provided on the cooling roll of rotation, by making the provided Fe-based alloy molten liquid to be rapidly condensed and solidified, a free solidification surface and a roller contact surface are obtained. And a Fe-based amorphous alloy thin strip with a width of 25 mm and a thickness of 13.4 μm.
[0243] Here, "bal." (balance) is a value corresponding to "100-a-b-c-d-e" in the composition formula (A).
[0244] The obtained Fe-based alloy ribbon is an Fe-based amorphous alloy ribbon, that is, the alloy structure is formed by an amorphous phase, which can be confirmed by observing the cross-section of the ribbon with a scanning electron microscope (SEM).
[0245] Throughout all the steps of this example, the alloy composition of the Fe-based alloy ...
Embodiment 2～4 and comparative example 1
[0286] The production conditions of the Fe-based amorphous alloy ribbon (including the alloy composition of the Fe-based alloy molten liquid) were the same as in Example 1 except for the changes shown in Table 1.
[0287] However, in Examples 3 and 4, the maximum holding temperature for the heat treatment of the wound body A was further changed to 550°C.
[0288] The results are shown in Table 1.
[0289] In Example 2, the following cooling rolls were used.
[0290] The cooling roll of Example 2 also has a water channel for circulating cooling water inside as a structure for cooling the outer peripheral portion.
[0291] -The cooling roll of Example 2-
[0292] ·Diameter: 800mm
[0293] ·Width: 150mm
[0294] ・Thickness of outer periphery: 20mm
[0295] ・Raw material of the outer peripheral part: Cu-Be alloy (Be: 2.0% by mass, the balance part is Cu and impurities)
[0296] ・Thermal conductivity of the outer periphery: 120W / (m·K)
[0297] In Example 3, the following coo...
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