JPS6066802A - Permanent magnet material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a permanent magnet material that can be used in a wide range of applications using permanent magnets such as home appliances, watch parts, automatic parts, etc. R2 is composed of 3d transition metals mainly consisting of rare earth elements' (R) and copal (Co).
The present invention relates to an improvement of an R-Co-Cu-Fe-based permanent magnet material mainly composed of an R2Co17 type intermetallic compound composed of a Co17 type metal.

(Prior art) Conventionally, as a rare earth-cobalt magnet material, RCo
, type and R2Co, , type, but generally, R2Co1. The theoretical maximum energy product ((BH) l
l1ax) is extremely large, so it is considered a promising magnetic material. However, currently developed R2Co
The maximum energy product of the 7-series magnet material is much lower than the theoretical value, and the magnetocrystalline anisotropy and coercive force (IHc) are smaller than RCo5, making it suitable for thin magnet materials. The problem was that it was not very suitable. However, the residual magnetic flux density (Br) of R2Co17-based magnet material is better than that of RCOs-based magnet material, so it is expected to obtain an excellent maximum energy product by reducing the coercive force by several pieces. .

From this point of view, we investigated the effects of various additive elements on the coercive force of R2C0 and F-based magnet materials, and found that the addition of B was particularly effective. I applied.

(Invention No. 1) This invention relates to the permanent magnet material according to application No. 1,
Residual magnetic flux density (Br) and maximum energy JJ'1 (
(B H

(A, 11 of the invention) The permanent magnet material according to the present invention has REM (
One or more rare “class 2 elements including Y) +20-
30%, Cu: 2-6%, Fe: 15-25%, Zr
: 1 to 5%, B: O, OO 1 to 0.5%, if necessary, Ti: 3% or less.

V: one or two of 3% or less and 0.001
≦B/(Zr+Ti+V)<0.1, remainder substantially Co
It is characterized by more.

That is, the permanent magnet material of the present invention improves the residual magnetic flux density (Br) and the maximum energy product ((B H) maw) of the permanent magnet material of the previously filed invention, and particularly further increases the coercive force (■Hc). It is elevated. In other words, if the Cu content is increased in the R-Go-Cu-Fe-based permanent magnet material, the coercive force will improve, but the residual magnetic flux density will decrease, and therefore the maximum energy will increase. Therefore, the Cu content 7d was set lower than the Cu value of the previously filed invention, and B and Zr were combined in order to prevent the coercive force from decreasing due to the lower Cu content. By adding Zr in an appropriate amount, the effect of adding B is promoted by adding Zr, thereby further improving the coercive force.

Next, the component range of the permanent magnet material of this invention (heavy-'7:
%) will be explained below.

REM (one or two parts of rare earth elements including Y)
:20~. 30% REM is an element that forms the basic component of R-Co-Cu-Fe-based permanent magnet materials, and is an effective element for ensuring a high maximum energy product of permanent magnet materials. It is necessary to contain 20% or more. However, if a large amount of I is contained, the residual magnetic flux density decreases, the maximum energy product decreases, and since it is an expensive element, it is economically disadvantageous, so it was limited to 30% or less.

Note that REM here is a rare earth element containing Y,
Basically, La, Ce, Pr, and Nd.

Pm, Sm, Eu, Gd, Tb, Dy, Ho.

One or more of Er, Tm, Yb, Lu and Y may be used.

Cu: 2 to 6% Cu is an effective element for increasing the coercive force of R-Co-Cu-Fe-based permanent magnet material. 5% or more, but on the other hand, if the Cu content increases, the residual magnetic flux density decreases and the maximum energy product decreases, so it was set to 15% or less, but in this invention, the -1-limit of Cu is set to 6%, which is excellent. C
In order to increase the u content to 2% or more and further increase the coercive force compared to the conventional Cu content, as described below, B and Zr are added in combination and B/Zr4- is commi-rolled. As a result, a permanent magnet material with significantly superior coercive force, residual magnetic flux density, and maximum energy product was obtained.

Fe: 15-25% Fe is R-Co-Cu-Fe system (1) Permanent magnet rice A4
It is an effective element for obtaining an excellent residual magnetic flux density in the field, and it is necessary to contain it in an amount of 15% or more in order to obtain such an effect. However, if it is contained in a large amount, the coercive force suddenly decreases to 1.
(limited to 25% or less).

B: 0.001 to 0.5% B is an element that can significantly improve the coercive force by adding a small amount to R-Co-Cu-Fe-based permanent magnet materials. And 0.001% for R-Co-Cu-Fe-based permanent magnet materials.

Since the effect of increasing the coercive force is recognized by the addition of the following, 0
．． 001% or more. However, if a large amount is added, the occupancy of non-magnetic boride becomes significantly large and the residual magnetic flux density and coercive force decrease, so it is necessary to limit the content to 0.5% or less.

When adding this B, low 1A with Co, Cu, Fe, etc.
[When using liquid phase sintering by point coproducting, within the composition range of the components in this invention, the larger the amount of powder with a eutectic composition, the more liquid phase will be generated, and it is expected that the sintered body will be highly enriched. Therefore, it is more desirable to use a powder having a eutectic composition.

Furthermore, B acts as a PfJ remover during melting, and in the production of sintered magnets, it makes it easier to grind the powder, producing uniform and fine powder, and at the same time promoting sintering, improving magnetic properties. It is effective in bringing about

Zr: I-5% big O, OO1≦B/Zr<0. IZ
r is an element that forms a metal 1m compound with B and has the effect of further enhancing the effect of adding B described in m, and is an element that is extremely effective in improving coercive force when the Cu content is reduced, In order to obtain such an effect, it is necessary to contain 1% or more. However, if added in a large amount, the residual magnetic flux density will decrease and the maximum energy product will decrease, so it should be kept at 5% or less2.In addition, in relation to the B content, in order to further enhance the effect of B addition, B/Z r≧ to avoid negative effects on coercive force, residual magnetic flux density, and maximum energy product.
It was set to 0.001.

Ti: 3% or less, v: 3% or less, and 0.001≦B/ (Z r +T i +V)
<0.1 Ti and V form an intermetallic compound with B, have the effect of promoting the effect of adding B, and are effective elements for improving coercive force. You can also replace it with However, even if all of Zr is replaced with Ti and/or V, the effect of improving the coercive force cannot be obtained in the case of Zr addition, so each is set at 3% or less, and in relation to the B content, Zr+T to enhance the effect of B addition
i+V(7) Total amount TEB/ (Z r×T i +V)
< 0.1 and to avoid negative effects on coercive force, residual magnetic flux density, and maximum energy product.
i+V)≧0.001.

(Example 1) Using a button melting furnace adjusted to an argon atmosphere, 2
6%Sm-4.5%Cu-20%Fe-32%Zr-C
o! I (this component, and further, B is Q, 002%,
0.003%, 0.005%.

o, oi%, 0.05%, 0.1% l013% and 0
A total of 8 types of alloys with 5% addition were produced. Next, each of these alloys was pulverized in a milk mill, and then finely pulverized in a jet mill to an average a diameter of about 4 μm. In this case, the B-rich alloy was ground to a predetermined powder particle size in a short period of time.

Next, each of the above powders was mixed with about 1 tonf in a magnetic field of 10 KOe.
After press forming under a pressure of /cm2, each molded body was sintered at 1220°C for 1 hour in an argon atmosphere, followed by solution treatment and then soo'c.
It was aged. Next, the magnetic properties of each of the obtained sintered bodies were investigated, and the results were as shown in Table 1.

As shown in Table 1, REM (-5m as an example), C
Even when u, Fe, Zr, and B are all within their respective upper and lower limits, in the case of No, l, 2, where B/Zr is smaller than o, ooi, and B/Zr is smaller than 0.1. In the case of large N098, the coercive force (IH
c) is a fairly low value, and the residual magnetic flux density (Br)
It is clear that the maximum engineering force ((B H) max) is also low.

(Comparative example) Using a button melting furnace adjusted to an argon atmosphere,
%Sm-7%Cu-20%Fe-3,2%Zr-Co and 26%Sm-1%Cu-20%Fe-3,2%Zr
An alloy containing -Co as a basic component and 0.05% of B was melted. Next, each of the alloys was roughly pulverized in the same manner as in Example 1, then finely pulverized, and then press-formed in a magnetic field of 1 OKOe under a pressure of about 1 ton f/Cm2, h', and then Example 1. The magnetic properties of each sintered body were investigated by sintering and heat treatment in the same manner as above. The results are shown in Table 2.

As shown in Table 2, in the case of NO19 with an excessively high Cu content, although the coercive force is relatively good, the residual magnetic flux richness is low and the maximum energy product is also low. Further, in the case of No and 1O, which have a low Cu content, the coercive force is quite low, and the maximum energy product is also a quite low value.

(Example 2) Using a button melting furnace adjusted to an argon atmosphere, 2
6%Sm-4.5%Cu-20%Fe-(0,2)%Z
r-(0,0,6,1,2゜1,6,2)%Ti-
(0,0,6,1,2゜1,6,2)%V-0.0
5% B-CoJ: Six types of alloys shown in Table 3 were melted. Next, each alloy was coarsely pulverized in the same manner as in Example 1, and then finely pulverized.
The sintered bodies were molded at a pressure of onf/cm 2 , followed by sintering and heat treatment in the same manner as in Example 1, and the magnetic properties P1 of each sintered body were examined. The results are shown in Table 3.

As shown in Table '53, REM (-Sm as an example)
, Cu, Fe, Zr, and B are each within the upper limit and lower limit of υ, and when both Ti and V (No, 11) or one (No, 12, 13) are added, the coercive force (IHc), residual magnetic flux (Br), and maximum energy ((BH) max) are all quite high values, whereas Ti without the addition of Zr
and ■ either (No, l 4, No, 1
5) or both (No. 16), the coercive force (IHC) is particularly low, and the residual magnetic flux (Br) and the maximum energy product ((B H
) maw ) is also a low value.

In addition, in the example described in -, the case where Sm is taken as an example of REM is shown, but when one or more kinds of other rare earth elements are used, the same effect as in "↓1 of Sm" is shown. It is possible to obtain permanent magnet materials with good magnetic properties.

Further, when adding B, good magnetic properties can be obtained even if it is done in the form of B powder or Fe2B powder after coarsely pulverizing an R7Co17 alloy or grinding it into a fine powder.

(Effects of the Invention) As explained above, the permanent magnet material according to the present invention has, in weight percent, REM (one or more rare earth elements including Y) = 20 to 30%, Cu: 2 ~6%, Fe
:15-25%, Zr:1-5%, B:O, OO1-0
．． 5%, if necessary, one or two of Ti: 3% or less, V: 3% or less, and O, OO1≦B/(Z
r0T i 10V) <0, 1, since the remainder is substantially made of Co, the residual magnetic flux density (Br) and maximum energy of the conventional 42 permanent magnets! +'i((B
H) max), and especially the retention/ε force (I
Hc) can be significantly increased, making it suitable for thin magnetic materials and home appliances.

It has an outstanding effect in that it can be used in a wide range of applications using permanent magnets, such as watch parts, automobile parts, etc.

Claims (1)

[Claims] (]) Weight b1%, REM: 20~30%, Cu: 2~
6%, Fe: 15-25%, Zr: 1-5%, B: O,
OOl ~0.5%, and 0.001≦B/Zr<0.
1. A permanent magnetic material characterized in that the remainder essentially consists of Co. (2) In correct amount %, REM: 20-30%, Cu: 2-6
%, Fe: 15-25%, Zr: 1-5%, B: 0. O
Ol ~ 0.5%, and one or two of Ti: 3% or less, v: 3% or less, KakO, o01 ≦B / (Z r + Ti + V
) <0.1, a permanent magnetic material characterized in that the remainder consists essentially of Go.