Manufacture method for magnetic powder, magnetic powder and binding magnet
A manufacturing method and technology of bonded magnet, applied in the field of magnet powder and bonded magnet, can solve the problems of low magnetic performance, reduced corrosion resistance and the like
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[0072] Configuration of Quenched Ribbon Manufacturing Equipment
[0073] figure 1 It is a perspective view showing the configuration of an apparatus (quickened ribbon manufacturing apparatus) used in the first embodiment of the magnet powder manufacturing method of the present invention. figure 2 is the composition figure 1 The front view of the cooling roll of the quenched ribbon manufacturing apparatus shown. image 3 yes figure 2 An enlarged cross-sectional view of the chill roll shown.
[0074] The magnet powder of the present invention will be used figure 1 The quenched ribbon (ribbon-shaped magnet material) produced by the quenched ribbon manufacturing apparatus shown is obtained by pulverizing. First, the configuration of the quenched ribbon manufacturing apparatus 1 will be described.
[0075] Such as figure 1 As shown, the quenched ribbon manufacturing device 1 is provided with a cylinder 2 capable of accommodating a magnet material and a cooling roll 5 t...
Embodiment 1
[0243] Magnet powder was produced under the production conditions (No. 1 to No. 10) shown below.
[0244] Manufacturing Condition No.1
[0245] First, prepare a copper roll base material (diameter 200mm, width 30mm, thermal conductivity at 20°C: 395W·m -1 ·K -1 , Thermal expansion coefficient (linear expansion coefficient α) at 20°C: 16.5×10 -6 K -1 ), cutting the peripheral surface to form a roughly mirror surface (surface roughness Ra0.07μm).
[0246] Thereafter, cutting is performed to form substantially parallel grooves along the rotation direction of the roll base material.
[0247] Utilize ion plating to form the VN surface layer that is ceramics on the outer peripheral surface of this roller base material (the thermal conductivity at 20 ℃: 11.3W·m -1 ·K -1 , Thermal expansion coefficient (linear expansion coefficient α) at 20°C: 9.2×10 -6 K -1 ), get as Figure 1 ~ Figure 3 Chill roll A shown. The thickness of the surface layer was 5 μm. In addition, afte...
Embodiment 2
[0303] Each magnet powder obtained in Example 1 was mixed with an epoxy resin and a small amount of hydrazine-based antioxidant, and kneaded at 100° C. for 10 min (warm kneading) to prepare a bonded magnet composition (mixture).
[0304]At this time, the mixing ratios (weight ratios) of the magnet powder, epoxy resin, and hydrazine-based antioxidant were 97.5% by weight, 1.3% by weight, and 1.2% by weight, respectively.
[0305] Next, crush the mixture into granules, weigh the granules, fill them in the metal mold of the pressing device, perform compression molding (warm molding) at a temperature of 120° C. and a pressure of 600 MPa in the absence of a magnetic field, cool down, and release the mold. Finally, heat the epoxy resin at 175°C to cure it, and obtain a cylindrical bonded magnet with a diameter of 10 mm x a height of 7 mm (for magnetic properties and heat resistance tests) and a flat plate-shaped bonded magnet with a diameter of 10 mm x 3 mm in thickness (mechanical)....
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Abstract
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