JPS5835251B2 - Permanent magnetic alloy containing rare earth metals - Google Patents

Description

[Detailed description of the invention] The treasonous invention is samarium as a rare earth metal. The present invention relates to an improvement in a permanent magnet alloy containing (Sm).

Conventionally, rare earth metal content represented by the formula RM2 (4.0≦2≦8.5, where R is a rare earth element such as Sm, Ce, and Y, and M indicates a case where Co and Co together with Cu and other metal elements are included) Permanent magnet alloys with various compositions have already been proposed; for example, in JP-A-50-30734, a rare earth metal system of cerium and samarium has been proposed.
It is an iron group metal system consisting of 13 atomic percent, the balance being cobalt, manganese, and copper, and the rare earth metal system is cerium 1.2 to 11.05 atomic percent, and samarium 1.8 atomic percent.
~11.7 atomic percent, the above iron group metal systems include 60.9 to 77.44 atomic percent cobalt, and 2.1 atomic percent manganese.
75-10.56 atomic percent, copper 7.83-15.
A rare earth intermetallic magnet material is disclosed that is characterized by 64 atomic percent.

Furthermore, in Japanese Patent Application Laid-open No. 50-115117,
The main components are 23-30% Sm and 0.0% Ti by weight.
A permanent magnet containing 2 to 1.5% of Cu, 9 to 13% of Cu, 3 to 12% of Fe, and the balance Co is disclosed.

Such Sm-Co-Fe-Cu-based magnet alloys are known to exhibit particularly excellent magnetic properties among rare earth element-containing magnet alloys, and for example, one with a maximum energy product of 25 MGOe has been developed. ing.

However, this does not mean that the above-mentioned excellent magnetic properties are the theoretical limit, and there is naturally room for further improvement.The present inventors have conducted extensive research from this perspective, and have A detailed study of the effects of adding Mn and Ti to -Fe-Cu based magnet alloys revealed that for this type of magnet alloy, z =
Contrary to the conventional wisdom that the best characteristics (maximum energy product, etc.) are obtained near 7.0,
The present invention was completed by confirming that there is a composition that gives an extremely high maximum energy product of 29MGOe in the vicinity of =6.8.

The present invention relates to a rare earth metal-containing permanent magnet alloy having a composition represented by 0.012.6.6≦2≦7,0, R being a rare earth metal consisting essentially of Sm.

The present invention provides the above-mentioned v, w, x, y and 2
As can be seen from the values of , we are providing a Sm-Co-Fe-Cu-Mn-Ti-based magnet alloy with a completely new composition that has never existed before.
v, w, x, y and 2) are the results of our extensive research, namely the maximum energy product (BH) m
It is determined based on the characteristics of ax as well as the residual magnetization Br1 and the coercive force iHo, which are representative characteristics of a magnet, and will be specifically explained below with reference to the attached drawings.

First, the magnetic alloys having the compositions shown in each figure were manufactured as follows.

That is, Sm, Co, and Fe. Approximately 5 ky of metal raw materials of Cu, Mn, and Ti are mixed in a predetermined ratio into an aluminum crucible, melted by high-frequency heating in a vacuum furnace, and cast into a water-cooled iron mold to form an ingot. The obtained ingot was pulverized in a Brown type mill and further jet-pulverized with a nitrogen stream to obtain a fine powder with a particle size of 1 to 5 μm.The fine powder of catfish was filled into a mold to produce approximately 15 KOe.
The molded body is formed by compression molding at a pressure of about 1000 kg/- in a magnetic field aligned magnetically in the direction of easy magnetization, and then sintered in vacuum at a temperature of 1210 to 1170°C. After sintering, Cooled in a separate vacuum furnace chamber.

The sintering time was 1 hour, and the sintering temperature was set to maximize the magnet properties, especially the maximum energy product, depending on the individual case, and the aging treatment after sintering was performed in a vacuum furnace for 400 seconds.
Although the test was carried out in a temperature range of oo'c, the specific temperature and time conditions were set so that the coercive force was as large as possible.

In the magnet alloy of the present invention, when the aging temperature is 700° C. or less, the coercive force initially increases with aging time and then reaches saturation.

In many cases, good results can be obtained by aging at 650° C. for 4 hours.

This shows the characteristic values when changing the value of 2 in a magnetic alloy with the composition shown by z = 6.
．． Maximum energy product is 25M in the range of 6 to 7.0
It can be seen that there is a region where the magnetization value is higher than GOe, especially the maximum value of 29 MGOe, and that both the residual magnetization and the coercive force exhibit good values in that region.

Figure 2 shows the characteristic values when the value of X is changed in a magnetic alloy having the composition shown by the formula.
In the range of 17 to 0.04, the maximum energy product is 2
It can be seen that there is a region where the magnetic force is 4 MGOe or more, especially the maximum value of 28.6 MGOe, and that a coercive force of 6 KOe or more is realized.

Figure 3 shows the % property value when the value of y is changed in a magnetic alloy having the composition shown by the formula, and according to this, y=o, o
In the range of ot to 0.012, there exists a region where the maximum energy product is 25 MGOe or more, especially the maximum value of 28.4 MGOe, and the coercive force almost reaches saturation at y = 0.01, and when y is 0. It can be seen that when the value exceeds 012, the residual magnetization decreases.

This shows the characteristic values when the value of y is changed in a magnetic alloy with the composition shown by .According to this, almost the same as in Fig. 3, the maximum value is in the range of y=o, oot ~ 0.012. It can be seen that there is a peak in the energy product, and when y becomes O.015 or more, the residual magnetization decreases (in this case, the density of the sintered body also decreases significantly).

Further, the effects confirmed in the present invention cannot be achieved by adding Mn or Ti alone, but significant effects can only be achieved by adding both at the same time and within a very limited range.

This shows the characteristic value when the value of V is changed in a magnetic alloy with the composition shown by, and according to this, v=0.1
The peak of the maximum energy product exists in the range of 2 to 0.18, and when V exceeds o, ots, the coercive force sharply decreases.

This shows the characteristic values when the value of W is changed in a magnetic alloy having the composition shown by, and according to this, w=0.
The peak of the maximum energy product exists in the range of 0.075 to 0.11, and when W exceeds 0.11, the residual magnetization decreases rapidly.

Both FIGS. 7 and 8 are given as comparative examples, and FIG. 7 shows the respective characteristic values when X or W is changed in a magnetic alloy having the composition shown by the formula.

In these cases, even if the maximum energy product is 2
4 Group e, (v
=0.16), sufficient holding force cannot be obtained in the ``• region of W2O,14.

For example, in Figure 7, when w = 0.10, x = 0.0
In the range of 2 to 0.05, the maximum energy product is 20MGO
Although there is a region where the coercive force is greater than e, the coercive force is insufficient.

Next, we set each parameter (v, w, x, y, and 2) to a specific value, and performed the sintering and aging treatments under the optimal conditions (Experiments/161-1).
Table 1 shows the density and magnetic properties of the magnetic alloy obtained in Example 0).

Experiments /167 and /168 show the present invention, and all the others show comparison f11.

Its properties are unexpected.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8 show the relationship between magnet composition and magnet characteristics.

Claims (1)

[Claims] 1 Formula R(Co1-v-w-x-yFevCuwMnx
Tiy)z (however, 0.12≦v≦0.18, 0.0
75≦W≦0.11, 0.017≦x≦0.04, 0.
A permanent magnet alloy containing a rare earth metal, characterized in that it has a structure represented by 001≦y≦0.012, 6.6≦τ≦7.0, R is a rare earth metal consisting essentially of samarium.