JPS60238448A - Permanent magnet containing rare earth element - Google Patents

Abstract

PURPOSE:To obtain a low-cost permanent magnet having high performance by using an La-Ce-Di(didymium; an Nd-Pd alloy)-Fe-Co-B alloy and regulating the composition. CONSTITUTION:This permanent magnet contg. rare earth elements is made of an alloy having a composition represented by the formula (where 0<X<=0.1, 0.1<= Y<=0.5, 0.1<=Z<=0.85, 4.0<=L<=8.0, 0.1<=M<=0.8, 0.02<=N<=0.2, and 0<1-X- Y- Z<=0.8). In the alloy, La-Ce-Di obtd. in a stage for extracting separated rare earth elements is used, and the composition is regulated as mentioned above. La- Ce-Di is available at a much lower cost than separated rare earth elements. High magnetic characteristics are provided to the magnet, and the Curie point Tc is increased because of added Co.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to rare earth permanent magnets manufactured from alloys of rare earth metals, transition metals, and semimetal or semiconductor elements.

[Prior art]

The rare earth magnet currently being industrialized is Sm0os.

Sm(TM)ty (TM represents a transition metal)
, and N6-Fe-B yarn. The rare earth metal wires used in these magnets, monazite, bastnaesite, and other ores are separated and extracted using ion exchange and solvent extraction methods, which increases the cost and requires them to be used in large quantities. Problems have arisen in the separation of boxes, including concerns about the amount of supply. For this reason, some attempts have been made to develop low-cost rare earth magnets using low-cost mixed box metals (Mitsuhmetal, hereinafter abbreviated as MM).

The magnetic performance of a magnet using MM as the rare earth component is as follows: In the case of a sintered magnet with MMOo5, the residual magnetic flux density (hereinafter referred to as 1.i, abbreviated as Blr) is 8100 (G), and the intrinsic coercive force (hereinafter referred to as , iHc) 9000 (Oe), maximum energy product (hereinafter abbreviated as (B H) max) 14,
5 (M G Oe ) (H, Nagel, H, P,
ni1einA EngineeringP Conf, Proc 24 695
(L974)) etc. have been reported. However, permanent grindstones using a mixed grinder generally have a drawback of low magnetic performance. In addition, the magnet of N d -F e -B thread, which has relatively high magnetic performance, has a Curie point (Tc)
Since the temperature is as low as 350 ('C), there are considerable limitations in actual use.

〔the purpose〕

The present invention is intended to solve these problems, and its purpose is to develop a low-cost, high-performance permanent magnet.

〔overview〕

The permanent magnet of the present invention is made of L a -Oe -D i (didymium and a part of B in the alloy are At, Ga, N, Sn,
It is characterized in that it is manufactured by a sintering method or a resin bonding method using an alloy substituted with one or more elements from the element group Pd, Bi, c, Ge, and PIS. Mixed rare earth metal L a -OB -D i is obtained in the process of extracting separated boxed metals, and the cost is much lower than that of separated boxed metals, and L a -Oe -D i
By specifying the composition of the -Fe-Co-B system, high magnetic performance was obtained, and by adding CO, an improvement in TO was observed.

〔Example〕

The present invention will be described in detail below based on examples.

<Example 1> An alloy having the composition shown in Table 1 is melted in Ar gas using a low frequency melting furnace.

Table 1: The alloy was solution treated at 1170°C for 10 hours, and at 800°C.
The material is aged for 4 hours, and then ground in a ball mill to form a fine powder with a particle size of 2 to 80 microns. Add 2. epoxy resin to this magnetic powder. (: 3% by weight is added and kneaded, and this mixture is compression molded in a magnetic field. This molded body is
Get a permanent magnet by heating for a while. The magnetic performance of the obtained permanent magnet is shown in Table 2. From Table 2, the magnet of the present invention uses a mixed box.
It turns out that EH is dominant.

Table 2 <Example 2> Compositional formulas are aeo, asLao, o 6Pro, INdo
, s (Feo, s 9-No□0.41BN) 56, and a permanent magnet is produced using the same method as in Example 1 using yarns in which the value of N is changed. The magnetic performance of the obtained permanent magnet is shown in FIG. It can be seen from FIG. 1 that the value of n is preferably in the range of 0.02≦N≦0.2.

<Example 6> The composition formula is Oeo, 35LaO, 05Pro, lNa0.
5. Manufacture a permanent magnet using the same method as in Example 1 for a system expressed as (?eOJ00oo41BO,Oc+)z in which the value of L is changed.0 The magnetic performance of this permanent magnet is shown in Figure 2. show.

It can be said that the value of L is preferably 4.0≦L≦aO.

<Example 4> Composition formula is aeo, a5Lao, o5Pro, INd
o, s (Fe0.91-MCOMBo, 09) 56
As shown in the figure. Although Tc is improved by adding CO, if M>0.8 or more, it becomes disadvantageous in terms of cost, so the value of M is preferably in the range of 0.1 part M≦0°8.

<Example 5> A permanent magnet is manufactured using the same method as in Example 1 using an alloy having the composition shown in Table 6. The magnetic performance of this permanent magnet is shown in Table 4.

From Table 3 and Table 4, a part of B is At, oa; Eng, Sn, -Pd
, Bi, Si, C, Ge, P, and S, good magnetic performance can be obtained.

Table 4 (Example 6) Sample N[L in Examples 1 and 5 Alloys having compositions 1 and 7 are melted in Ar gas using a low frequency melting furnace. The alloy is made into a fine powder with a particle size of 2 μm to 5 μm using a ball mill. This powder is compression molded in a magnetic field, and the compact is sintered at 1200° C. for 1 hour, then solution treated at 1170° C. for 2 hours, rapidly cooled, and further aged at 800° C. for 4 hours to obtain a permanent magnet. The magnetic performance of this permanent magnet is the fifth
When the magnets shown in the table are produced by the sintering method, SmCO
It has magnetic performance comparable to No. 5 sintered magnet.

<Example 7> Powder having a particle size of 2 μm to 80 μm is prepared using the same method as in Example 1 for alloys having the compositions of samples Nα1 and 7. This powder is kneaded with a resin and molded in a magnetic field using an extrusion molding machine and an injection molding machine. Table 6 shows the molding conditions, and Table 7 shows the magnetic performance of the obtained permanent magnets.

Table 6 [Effects] As described above, according to the present invention, it is possible to supply high-performance rare earth permanent magnets at a low price, so it can be said that the present invention has a great effect on the industrial world.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between the amount of B and magnetic performance. Figure 2 is a graph showing the magnetic performance of a magnet when the value of L is changed. FIG. 6 is a graph showing the relationship between the amount of CO and the increase in Tc. Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami 0 0.05 0. j O, 150, 2N Q → Figure 1 L straight → Figure 2

Claims (2)

[Claims] (1) Atomic ratio eel-X-Y-Z LaxPryNd
z(Fet-M-NooMBN) L l (However, X, Y
, Z, L, M, and N are each in the following ranges. ) 0〈x≦o, 1 0.1≦Y≦0.5 0.1≦2≦0,85 40≦L≦a0 0.1 part M≦0.8 002≦N≦0.2 ' o( A rare earth permanent magnet characterized by being made of an alloy having a composition expressed as 1-x-y-Z≦80. (2) Part of B is At, Ga, N, Sm, Pd, B
2. The rare earth permanent magnet according to claim 1, wherein the rare earth permanent magnet is substituted with one or more elements from the element group consisting of i, Si, O, Ge, P, and S.