JPS5927756A - Production of thin sheet of permanent magnet material - Google Patents

Abstract

PURPOSE:To obtain a thin sheet of permanent magnet material having excellent toughness and mechanical strength by melting rare earth metals and Co or Co and Fe, Cu, Zr, Si, B by high frequency heating in a non-oxidative atmosphere and blowing the melt out onto the surface of a rotating body under high speed rotation. CONSTITUTION:1 or >=2 kinds among La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Y which are rare earth elements, and >=1 kind among Co, Fe, Cu, Zr, Si, B including Co are sealed in a quartz tube 2 by a non-oxidative gaseous P. The materials are then heated to 1,100-1,500 deg.C with a high frequency coil 1 to make homogeneous molten metal 3. The molten metal 3 is blown out onto the surface of a rotating body 7 under high speed rotation through a nozzle 4 by the pressure of the gas P. The molten metal 3 is cooled to solidify to a thin sheet 6. The sheet passes between magnets 5 for magnetization and is thus magnetized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention contains rare earth metals containing a large amount of CG, Fe, C.
u.

The present invention relates to a method for manufacturing a thin plate rare earth metal permanent magnet alloy consisting of Z'r and B.

Rare earth CO magnets containing large amounts of rare earth elements have been
The chemical formula M5 and R2M17 [where R is composed of one or a combination of two or more so-called rare earth metals of the lanthanide series (including Y), and 2M is Co+ or Co, F
This is a magnetic material with large crystal magnetic anisotropy that is mainly composed of an intermetallic compound consisting of one or a combination of two or more of e, Cu, and Zr.

As for its magnetic properties, the Ba-+Sr-ferrite magnetic product (BH) max is extremely high, so rare earth CO
Industrial demand for magnets has increased in recent years.

Its mass production technology has reached the stage of completion.

Currently manufactured Sm Co5 + Sm2 Co, 7
The common manufacturing method is mainly powder metallurgy. After melting (or reducing: Sm2O3→Sm+02), the cast alloy (or powder) is coarsely ground and then finely ground in an organic solvent such as toluene to protect active rare earth metals that are easily oxidized. After making it into a fine powder (2 to 571771), it is dried in a non-oxidizing atmosphere, oriented into an arbitrary shape in a magnetic field, and molded without zero. The freeless body is sintered, solution treated, and special treated in a non-oxidizing atmosphere.

The magnetic properties of rare earth Co magnets have been obtained. The advantages of this powder metallurgy method are: ■ It is very mass-producible. ■ It has a high yield. ■ It is easy to meet various shape requests. On the other hand, it has disadvantages. Difficult to control. ■Similar.

It is easy to catch fire, and disaster prevention needs to be taken into consideration. ■Since the powder is sintered without flames, it is technically difficult to manufacture thin objects of less than 1 mm because of cracking during pressing and cracking during sintering. Examples include.

An object of the present invention is to provide a manufacturing method that improves the above-mentioned drawbacks.

That is, to explain in detail the manufacturing method of the present invention, the present invention is a rare earth metal such as lanthanoid La, ce.
tPr +Na pPmr SmyEu +Gd +T
b, Dy, Ho, Er, Tm, Yb.

One or a combination of two or more rare earth metals containing Lu, Hf, and Y + Co or Co, Fe, Cu
, Zr.

One type of Si pB, or a combination of two or more types, is heated to 1100 to 15 by high frequency melting in a non-oxidizing atmosphere (mainly Ar).
Make a homogeneous molten metal at 00℃, and send it through a nozzle with high speed rotation.
Thin plates are manufactured by blowing liquid onto the surface of a rotating body (roll or drum) and rapidly cooling the liquid.

According to the present invention, the homogeneous molten metal is instantaneously quenched, but at that time, the hot water blows out from the tip of the nozzle, and from the moment it comes into contact with the cooling roll that is rotating at high speed, the roll Solidification begins along the surface. During its solidification,
If a magnetized magnet is placed directly under the roll in the direction of travel, the solidified thin plate will move on top of the magnet so as to cut the lines of magnetic force perpendicularly, creating magnetic anisotropy in the thin plate. It is closed. The obtained thin plate is a homogeneous 2-meter plate that is made by instantaneously quenching the molten metal that has been uniformly molten using high-frequency melting, etc., and is hard and tough, and also has excellent mechanical strength. ing.

Two embodiments of the present invention will be described in detail below.

Referring to Figure 1, 1 is a high frequency coil, 2 is a quartz steel
3 is a molten metal, 4 is a molten liquid outlet, 5 is a magnetizing magnet, 6 is a thin plate magnetized in the thickness direction, 7
is a rotating cooling body or roll rotating at high speed.

The molten metal 3 has a temperature of 1,400 to 1,500°C, and when it is blown onto the roll surface at a pressure of P, it passes through the blow-off port 4 at point A and comes into contact with the roll 70 surface. that time.

The molten metal is cooled and solidified, and the remaining heat is conducted to the surface of the o-lure and continues to cool until it separates from the surface of the roll 7 at point B, reaching a temperature of 300 to 400°C. When it leaves the mouth, the surface of the Lua, the lamina has completely lost its redness;
The temperature can be visually confirmed to be 300 to 400°C.

During cooling from point A to point B, magnetization occurs between the magnets 5, and the thin plate becomes anisotropic in the thickness direction. The roll 7 is a hollow drum as shown in the schematic diagram of Fig. 2.
The hollow part is processed so that a permanent magnet 6 (eg, a ferrite magnet or a rare earth Co magnet) can be placed therein.

Of course, the drum is made of non-magnetic material.

According to the present invention, products with thinner plate thickness can be manufactured compared to conventional rare earth CO magnets.

Next, the present invention will be explained with reference to an example of a method for manufacturing a thin plate permanent magnet powder using two or more types of apparatus.

Example 1 The entire two-roll manufacturing apparatus including a 400 mm diameter hollow, non-magnetic roll was evacuated in a sealed room.

It should be about 10-3 mmHg. After that, it was sealed and pressurized with high-purity Ar gas to about 05 to 1.0 atm, and 35 wt% Sm + 65 wt% Co was placed in the 2 quartz tubes 2.
The alloy is melted by high frequency. After melting, the magnetizing magnet 5 is inserted into the hollow part so as to sandwich the outer peripheral part of the roll 7. Rotate roll 7 at 200 rpm, tip size 0.5 mm x 4 m
The liquid was sprayed onto the surface of the roll 7 from the nozzle 4 of the cylinder. As a result, a thin plate 6 with a thickness of 5 mm, a thickness of 60 μm, and a length of 5 m was obtained. This thin plate was cut into 150 pieces each and vacuum-sealed into two quartz tubes.

After holding it at 600°C for 1 hour, it was slowly cooled to 400°C at 25V for 1 hour, and after holding at 400°C for 1 hour, it was pulled out to a water cooling zone in the furnace and rapidly cooled. Note that an isotropic magnet was obtained in the same manner as above without using the magnetizing magnet 5.

Excellent magnetic properties were obtained compared to conventional isotropic magnets. That is, in the case of the above components, when no magnetizing magnet is used, the residual magnetic flux density Br is 6000 Gauss, and the coercive force lHc is 10,000 Oersted.

Furthermore, by adding anisotropy using the magnetization magnet 5, residual magnetic flux density Br=8000 Gauss, coercive force IHc=
15,000 oersted was also possible.

Example 2 23wt%Sm, 17%Fe y 5%Cup 3
The constituent elements of %Zr p 1 %B + bol + Co were dissolved in the same manner as in Example 1 to produce a thin plate.

The thickness of this sample was approximately 80 μm.

The heat treatment conditions are 700℃ x 1 hour and then 20℃ to 400℃.
After cooling in the furnace at ℃/1 hour and holding at 400℃ for 1 hour.

It was drawn out to a water cooling zone in the furnace and rapidly cooled.

2.000 oersted, further anisotropic, residual magnetic flux density Br = 10,000 Gauss, coercive force tHc
-6,000 oersted was obtained.

The two inventions have been described above regarding Sm-Co magnets.

It goes without saying that the present invention can be similarly applied to other rare earth magnet materials.

As described above, according to the present invention, a thin plate permanent magnet material can be easily manufactured while overcoming the conventional drawbacks.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the state in which the apparatus used for carrying out the method of the present invention is used, and FIG. 2 is a longitudinal sectional view thereof. 1... High frequency coil, 2... Quartz tube, 3...
・Molten metal, 4...Blowout port (nozzle), 5...
Magnetizing magnet, 6... thin plate, 7... roll. Figure 2

Claims (1)

[Claims] 1. Lanthanide La l Ce, a rare earth metal
IPr, Nd + Pm + SmyEu, Gci,
Tb + Dy5Ho, Er, Tm, Yb, Lu
, Hf + and at least one rare earth metal containing Y, and at least one of C09Fe, Cu, Zr+Si, and B containing Co are made into a homogeneous molten metal at 1100 to 1500°C by high frequency melting in a non-oxidizing atmosphere. A method for producing a thin plate permanent magnet material, comprising: blowing it out from a nozzle onto the surface of a rotating body rotating at high speed, and rapidly cooling the liquid to produce a thin plate.