r-t-b series sintered magnet
A technology of R-T-B and sintered magnets, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of difficult replacement and low coercive force, and achieve the effect of improving the bonding strength and high coercive force
Active Publication Date: 2018-05-04
TDK CORPARATION
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Problems solved by technology
[0008] The coercivity of the above-mentioned magnets is significantly lower than that of the Nd-T-B system of about 10kOe, and it is difficult to replace the existing Nd-T-B system magnets
Method used
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experiment example 1
[0046] The composition of the raw material alloy is 14.9mol%R-6.43mol%B-0.57mol%Co-0.06mol%Cu-0.44mol%Al-remainder Fe, and R is taken as R1:Ce=100:0~10 in mol ratio :90. The raw material metal or alloy is blended so that it has the aforementioned composition, and the raw material alloy sheet is melted and cast by a strip casting method.
[0047] The obtained raw material alloy sheet was subjected to hydrogen pulverization to obtain coarsely pulverized powder. To this coarsely pulverized powder, 0.1 wt% of oleic acid amide was added as a lubricant. Next, finely pulverize in a high-pressure nitrogen atmosphere using a jet mill (jet mill) to obtain a finely pulverized powder.
[0048] Next, the produced finely pulverized powder is shaped in a magnetic field. Specifically, molding was performed at a pressure of 140 MPa in a magnetic field of 15 kOe to obtain a molded body of 20 mm×18 mm×13 mm. The direction of the magnetic field is a direction perpendicular to the pressing dir...
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Abstract
The present invention provides a permanent magnet having excellent adhesion strength to a plating layer without significantly deteriorating magnetic properties compared with conventional R-T-B magnets. In the R-T-B magnet that must have R1 and Ce as R, the main phase particles are core-shelled by performing a long-term heat treatment on the R-T-B magnet as the raw material. When R1 in the core When the mass concentrations of Ce and Ce are respectively αR1 and αCe and the mass concentrations of R1 and Ce in the shell portion are respectively βR1 and βCe, the mass concentration ratio of R1 and Ce in the shell portion (βR1 / βCe=B ) to the mass concentration ratio (αR1 / αCe=A) of R1 and Ce in the core part (B / A) is 1.1 or more, whereby the adhesion strength with the plating layer is improved by adding Ce, and the correction is suppressed. Tenacity drops.
Description
technical field [0001] The present invention relates to a rare earth permanent magnet, in particular to a rare earth permanent magnet obtained by selectively substituting a part of R in an R-T-B permanent magnet with Ce. Background technique [0002] known as tetragonal R 2 T 14 The R-T-B magnet with the B compound as the main phase (R is a rare earth element, T is Fe or a part of it replaced by Co, and B is boron) has excellent magnetic properties, which is an invention since 1982 (see Japanese Patent Laid-Open Zhao 59-46008 Bulletin) since the representative high-performance permanent magnets. [0003] In particular, the R-T-B magnet composed of Nd, Pr, Dy, Ho, and Tb, whose rare earth element R is large, is widely used as a permanent magnet material because of its large anisotropic magnetic field Ha. In particular, Nd-Fe-B magnets in which the rare earth element R is Nd have a good balance of saturation magnetization Is, Curie temperature Tc, and anisotropic magnetic f...
Claims
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IPC IPC(8): H01F1/057H01F1/08B22F1/00
CPCH01F1/0577B32B15/015C22C38/002C22C38/005C22C38/06C22C38/10C22C38/16C22C33/0278B22F2998/10B22F2999/00C22C2202/02B22F1/00B22F2304/10B22F3/02B22F2202/05B22F9/08B22F9/023B22F2009/044B22F3/10B22F2003/248H01F1/0536
Inventor 榎户靖崔京九铃木健一田中大介
Owner TDK CORPARATION