Method producing rare earth magnet
a rare earth magnet and magnet technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacture, magnetic bodies, etc., can solve the problems of limiting the improvement of magnetization, the inability to obtain high magnetization, and the degree of crystal orientation, so as to improve the degree of orientation, improve the effect of crystal grain strain deformation and improve the effect of magnetization
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example 1
[0073]Rare earth magnets were produced according to the following procedure and under the following conditions based on the method of the invention, and their magnetic properties were evaluated.
[0074]Raw materials of a rare earth magnet were mixed in amounts that provided an alloy composition (% by mass) 31Nd-3Co-1B-0.4Ga-bal.Fe, and the mixture was melted in an Ar atmosphere. The melt was quenched by injecting it from an orifice onto a rotating roll (chromium-plated copper roll) to form alloy flakes. The alloy flakes were pulverized with a cutter mill and sieved in an Ar atmosphere to obtain a rare earth alloy powder W with a particle size of 2 mm or less (average particle size: 100 μm). The powder particles had an average crystal grain diameter of approximately 100 to 200 nm and an oxygen content of 800 ppm.
[0075]Description is hereinafter made with reference to the FIG. 10.
[0076]The powder W was filled into a cemented carbide alloy die D1 with a 10×10×30 (H) mm capacity, and the ...
example 2
[0086]Rare earth magnets were produced according to the following procedure and under the following conditions based on the method according to a preferred embodiment of the invention, and their magnetic properties were evaluated.
[0087]The same procedure from to as in Example 1 was followed to obtain a bulk body.
[0088]Description is hereinafter made with reference to FIG. 12.
[0089]The bulk body M0, which was formed as described above and as shown in FIG. 12(1), was set between φ30 mm cemented carbide alloy punches P2 with its orientation unchanged as shown in FIG. 12(2). The die / punch assembly was placed in the chamber, and the chamber was decompressed to 10−2 Pa. The die / punch assembly was heated with the high-frequency coils, and hot upsetting F was performed with a reduction ratio of 10, 30, 45, 60, or 80% immediately after the temperature reached 700° C. to obtain a preliminarily compact M1 (FIG. 12(3)).
[0090]As shown in FIGS. 12(4) to 2(5), the preliminarily compact M1 was ma...
example 3
[0094]A rare earth magnet was produced in the same manner as in Example 2 based on the method according to a preferred embodiment of the invention, and its magnetic properties were evaluated.
[0095]However, the preliminary hot working and hot working were performed as described below. Description is made with reference to FIG. 13.
[0096]The bulk body M0, which was formed in the same manner as in Example 2 and as shown in FIG. 13(1), was set with its orientation unchanged at the center of a cemented carbide alloy die D2 with a volume of 13×13×20 mm, using cemented carbide alloy punches P2 as shown in FIG. 13(2). The die / punch assembly was placed in the chamber, and the chamber was decompressed to 10−2 Pa. The die / punch assembly was heated with the high-frequency coils, and hot upsetting F1 was performed until the space in the die D2 was filled immediately after the temperature reached 750° C. to obtain a preliminarily compact M1 (13×13×8.8 (II) mm) (FIG. 13(3)). At this time, the reduc...
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Abstract
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