Process for producing alloy slab for rare-earth sintered magnet, alloy slab for rare-earth sintered magnet and rare-earth sintered magnet
A technology of sintered magnets and a manufacturing method, which is applied in the directions of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of inability to obtain alloy cast pieces, and achieve the effect of excellent magnet characteristics
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reference example 1
[0155] An alloy of 31.5% by mass of neodymium, 1.04% by mass of boron, and the balance of iron is mixed with neodymium metal, boron-iron alloy and iron, and melted in a high-frequency melting furnace in an argon atmosphere. In the state where the alloy is completely melted, after standing still for a while, the oxide of neodymium will float as slag, and then remove the slag.
[0156]Next, the obtained alloy solution having a temperature of 1500° C. was supplied to a single roll by the strip casting method, and cooled at a peripheral speed shown in Table 1 to produce an alloy cast sheet having a thickness of 0.2 mm. At this time, a tundish made of refractory ceramics was used. On the other hand, for iron rollers, Ra adjusted to 1 μm was used.
[0157] The average grain size of the obtained alloy slab, the average interval r of the R-rich region, and the total volume ratio of the chilled grain and the fine structure were measured. The results are shown in Table 1.
[0158] Ne...
reference example 2 and 3
[0160] Except that the thickness of the alloy cast pieces was 0.3 mm and 0.4 mm, alloy cast pieces and sintered magnets were produced in the same manner as in Reference Example 1, and various measurements were performed. The results are shown in Table 1. In addition, the alloy structure photographs of the thickness section (C section relative to the direction of rotation of the roll) of the alloy cast sheet obtained in Reference Example 3 separated from the cooling roll and perpendicular to the moving direction were observed through an optical microscope and a polarizing microscope. Figure 12 and Figure 13 shown.
[0161] Refer to Comparative Examples 1 and 2
[0162] After melting the alloy, do not stand still, remove the slag, and preheat the tundish, and use a copper roll with Ra of 7 μm, except that the thickness of the alloy cast piece is made 0.2 mm, 0.7 mm, the same as Reference Example 1 Operation, production of alloy castings, sintered magnets, and various measur...
Embodiment 1
[0170] An alloy of 31.5% by mass of neodymium, 1.0% by mass of boron and the balance of iron is mixed with neodymium metal, boron-iron alloy and iron, and melted in a high-frequency melting furnace in an argon atmosphere.
[0171] Next, the obtained alloy solution at a temperature of 1500° C. was supplied to a single roll through a tundish for strip casting, cooled and solidified at a peripheral speed of 0.8 m / sec, and an alloy cast sheet with a thickness of 0.3 to 0.4 mm was produced. The cooling roll used is, on the surface of the cooling roll, having figure 2 The solidification nucleation generation part of the protruding part and the solidification nucleation suppression part which is a recessed part of the cross-sectional shape shown are uniformly and continuously formed in a linear shape in the direction of rotation of the roller, and have Figure 4 A chilled roll made of copper with the surface pattern shown. The solidification nucleation generation part is formed at ...
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