JPS60218445A - Resin bonded rare earth element-cobalt magnet - Google Patents

Abstract

PURPOSE:To obtain an Sm-saving los-cost resin bonded rare earth element-Co magnet having high performance by substituting a rare earth element other than Sm for part of Sm in a 2-17 type rare earth element-Co magnet contg. Sm. CONSTITUTION:A rare earth element other than Sm is substituted for part of Sm in a 2-17 type rare earth element-Co magnet contg. Sm to obtain a resin bonded rare earth element-Co magnet having a composition represented by a formula Sm1-aRaTMz. In the formula, R is one or more among Y, Pr and Nd, TM is Co-base transition metals, z is the ratio of TM to rare earth elements, and a=0.2-0.5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention provides a 2-17 rare earth cobalt magnet using Sm. The present invention relates to a high-performance, Sm-saving and low-cost rare earth cobalt magnet in which a part of EIm is replaced with another rare earth element.

[Prior art]

The method of replacing Sm in order to improve the performance of rare earth cobalt magnets has been widely used in the 1-5 series, and has even been put to practical use in some cases. However, in the 2-17 series, compared to the 1-5 series, it is difficult to obtain a coercive force of 1Hc, so there are few research examples (
(K e n Oha 8 h i :EFFI!;C
TS OF PRASEODYM UM 5UBST TU-T ON ON PRF: q'IP TATIO
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95-501:1981) to some extent. According to this document, if 20 at or more of Sm is substituted, sintering will not be completed and the density will not increase. Also,
The coercive force iHc also decreased rapidly, and the amount of substitution was considered to be limited to about 20 at.

〔the purpose〕

The purpose of the present invention is to achieve Sm by using resin bonding method.
The objective is to significantly increase the amount of substitution, realize a composition that was impossible with the sintering method, and obtain a rare earth cobalt magnet with higher performance, less Sm, and lower cost.

〔overview〕

Among R, Go, and compounds (R is a rare earth element), elements with higher saturation magnetization 4π-8 than Sm include Y and Pr.

There are three types of N (1). Also, the content of these six elements in rare earth ores is several to several tens of times higher than Sm, making them very advantageous elements from a resource perspective. .

Therefore, if these elements can be replaced with Sm and used, it is possible to obtain a high-performance, Sm-saving, and low-cost 2-17 cobalt magnet. However, R',j! o,
, the compound (R is Y, Pr, Nd) has an anisotropic magnetic field H of 1
Approximately 0-20KOe and Sn+, approximately 100KO of 0Q17
If Sm is replaced with these R elements, the coercive force iHc will inevitably decrease. Furthermore, currently
The iHc of mass-produced sintered 2-17 cobalt magnets is not very large, about 6 to 10 KOθ, and according to the above-mentioned paper by Mr. Ohashi, when replacing 8m of Pr, Y, etc.,
The sinterability deteriorates and the density does not increase sufficiently. Therefore (B
H) max is not high, depending on the sintering method, it may be 20a
Sm [conversion of t% or more has not been realized. However, if the resin bonding method is used, even if Sm is replaced, the filling rate of the magnet powder can be maintained at the same level as that without replacement, so the properties of the component composition can be fully brought out. Furthermore, by appropriately changing the heat treatment depending on the amount of substitution, Sm substitution of up to about 50 at % became possible.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples.

Example 1゜The general formula is SmI-a Ra ('!Oo, svy au
ll, 0? ll F'eO, tlzro, oys )s
, 1 (R is Y, Pr, Nd, a is 0.1°0.3,0
．． Three types of alloys (5) were melted in a low frequency melting furnace to create alloy ingots. This ingot is 1100~12
Solution treatment was performed for 8 hours at various temperature ranges of 00°C, followed by aging treatment at 850°C for 6 hours, and anisotropic magnets were produced by a resin bonding method, and characteristics were compared. Note that the comparative example is 5ftl(OOo, ayy'!uo,.

71 F'eo,, tzro, ots)11.1
Solution treatment at 1190℃ x 8 hours, aging treatment at 850℃
℃ x 6 hours.

Characteristic evaluation results are shown below.

Table 1 (SST means solution treatment)
As shown in the table, according to the present invention, 1. 'Br.

It can be seen that (BH)max has increased significantly1
, and even if the a value indicating the amount of substitution increases, if the solution treatment temperature is set to an appropriate temperature, an iHc of 6 KOe or more, which is practically acceptable up to a = Q, 5, can be obtained. .

Example 2゜The general formula is Sm1-, -1. R1, R, b(OOo, e*
swao, oa F'i'O, 11°Hf0.01!
)y, e (R+ e Rt is Y, Pr, N(1,
A+b=α3) was melted in a low frequency melting furnace to create an alloy ingot. This ingot f1070...
Solution treatment was carried out for 24 hours at various temperature ranges of 1170°C, followed by aging treatment at 850°C for 20 hours, and anisotropic magnets were produced by a resin bonding method and their characteristics were compared. Note that the comparative example is Sm(000,6HI Cu, .

6 FEB, S. Hfo,. tt) 'r, e, solution treatment at 1160℃ x 24 hours, aging treatment at 850℃ x 20
It was time.

Characteristic results are shown below.

Continued on next page Table 2 As shown in Table 2, according to the present invention F), Y, Pr.

Even if two or more types of N(l are excluded, including Sm and l!), a significant increase in Br and (BH)max is seen, as shown in Table 1. This indicates that the composition of rare earth ore This shows that it is possible to replace the rare earth elements according to
It also shows that it is possible to manufacture low-cost magnets.

〔effect〕

As described above, according to the present invention, it is possible to improve the magnetic performance, particularly the energy product and the residual magnetic flux density, and to manufacture a rare earth cobalt magnet with reduced Sm and low cost.

that's all Applicant: Shoboseikogo Co., Ltd.

Claims (1)

[Claims] The composition formula is Sm1-aR,TM, (R is Y, Pr,
Element of at least 18i or more of Nd, TM is a transition metal mainly composed of cobalt, and shows the ratio of 2 digit rare earth elements to TM. ) is a so-called 2-17 series rare earth cobalt magnet, characterized by an a value in the range of 0.2 to 0.5 ((4-lipid bonded rare earth cobalt magnet,