JP2622779B2 - MnAlC-based composite magnet material and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a composite magnet material in which a MnAlC-based permanent magnet material produced by powder metallurgy and another metal material are concentrically and closely contacted with each other.
In particular, the present invention relates to a composite material containing a magnet material for obtaining a magnetic medium for a magnetic sensor and a method for producing the same.

[0002]

2. Description of the Related Art In order to detect the rotation of a shaft, a disk-shaped permanent magnet is mounted on the shaft, and a sensor having a magnetic semiconductor element or a detection coil, a magnetic switch, and the like facing the permanent magnet is known. When a strong remanence is required as a permanent magnet, for example, a MnAlC-based alloy molded by powder metallurgy is used.

[0003]

The permanent magnets formed by the powder metallurgical means as described above are often processed one by one by a hot press or the like, which is extremely inefficient. Also, since the molded permanent magnet material is extremely brittle,
Since it is difficult to perform joining such as drilling and thread cutting, when attaching this to a shaft or the like, there is no other choice but to use a mounting member with a complicated structure or attach it to the mounting member using an organic adhesive. A problem occurred in the impact resistance.

[0004] Further, even if an austenitic stainless steel such as SUS304 is combined with a MnAlC-based alloy and subjected to warm or hot extrusion to form a composite magnet, the austenitic stainless steel such as SUS304 and the like have a MnAlC-based alloy part. Is simply mechanically joined at the boundary of the joint, so that a joint with high joint strength is required (for example, for high-speed rotation), especially where the reliability of the joint is required Could not be used.

According to the present invention, a metal material which can be easily machined or joined for mounting and a permanent magnet material made by powder metallurgy are systematically integrated with each other, and the individual easily processed metal An object of the present invention is to provide a composite material capable of efficiently cutting out a large number of permanent magnets accompanied by materials.

[0006]

SUMMARY OF THE INVENTION In a composite material according to the present invention, one or more materials are present concentrically and closely together, and adjacent materials are systematically integrated by diffusion. . Here, the above-mentioned material is a combination of a MnAlC-based magnet alloy material and a MnNiCu-based or FeMnNi-based alloy material, and each of these metal materials is solid. In addition, the shape of the above-mentioned material may be a polygonal cylindrical shape and a polygonal prism in addition to the cylindrical shape and the cylindrical shape.

[0007] Such a composite magnet material is manufactured as follows. First, a powder material obtained by a gas atomization method of a MnAlC-based magnet alloy and, if necessary, a rod-shaped or cylindrical solid inserted concentrically in a cylindrical capsule made of a metal having sufficient strength and malleability. Quality MnN
An iCu-based or FeMnNi-based alloy material is filled and sealed to form a billet, which is subjected to warm or hot extrusion to obtain an extruded material having a reduced diameter.

Here, for example, SUS30 is used as a capsule.
When an austenitic metal such as 4 is used, the layer transferred from the capsule is removed as necessary after the extrusion. If the outermost layer of the composite material is a non-permanent magnet material, insert a MnNiCu-based or FeMnNi-based alloy cylinder so as to be in close contact with the inner surface of the capsule, or manufacture the capsule itself with a MnNiCu-based or FeMnNi-based alloy. .

In order to obtain a cylindrical composite magnet material having a through hole at the center, extrusion is performed while forming a central hole with a mandrel using a double cylindrical capsule. In this case, the inner cylinder portion of the capsule is also removed after extrusion using an arbitrary material as described above, or the inner cylinder itself is made of a MnNiCu-based or FeMnNi-based alloy material.

[0010]

In the above-described manufacturing process, the MnAlC-based magnetic alloy powder material filled in the capsule changes into a solid material during extrusion, and adheres to the surface of the MnNiCu-based or FeMnNi-based alloy material to form an alloy diffusion layer. Then, a composite magnet material in which a MnAlC-based magnet alloy and a MnNiCu-based or FeMnNi-based alloy material are concentrically layered can be obtained.

The composite magnet material obtained as described above is cut into a predetermined length, attached to a non-permanent magnet material portion, machined for other purposes, and magnetized to a permanent magnet for use. I do.

Accordingly, a permanent magnet structure having an easily processable metal portion bonded thereto can be efficiently produced from the composite magnet material obtained according to the present invention. Not only can machining such as drilling, cutting, and threading, and joining such as welding and brazing be facilitated, but also the joints such as high-speed rotation because each of the composite materials is joined by metal bonding with alloy diffusion It can also be used for parts where force is applied to the parts and parts where the reliability of joining is required (such as automobiles).

[0013]

EXAMPLE 1 As shown in FIG. 1 (a), a core 12 was placed in the center of a cylindrical capsule 11, and a MnAlC alloy magnet powder material 13 was filled between the core 12 and a lid 14 was provided. Extrusion billet 1
I made 6. The capsule 11 has a MnNiCu alloy (Ni: 18% by weight, Cu: 16% by weight, Mn: ba).
1, thermal expansion coefficient 27.4 × 10 ⁻⁶ / ° C.), FeMnNi alloy (Mn: 20% by weight, Ni: 10% by weight, Fe: b)
al, coefficient of thermal expansion 21.5 × 10 ⁻⁶ / ° C.), SUS304
(Coefficient of thermal expansion: 18.8 × 10 ⁻⁶ / ° C.) and four types of brass (coefficient of thermal expansion: 20.8 × 10 ⁻⁶ / ° C.), 84 mm in outer diameter and 1. 6 mm.
As the powder material 13, Mn: 69.05% by weight, A
1: 29.80% by weight, Ni: 0.7% by weight, C: 0.
MnAlC-based alloy consisting of 45% by weight (coefficient of thermal expansion: 22.
6 × 10 ^-6 / ° C) gas atomized powder with a maximum particle size of 2
Those having a size of 98 μm and an average particle size of about 60 μm were used. FeMnNi-based alloy, MnNi same as capsule material
Four types of materials, a Cu-based alloy, brass, and SUS304, were used, and the diameter was 58 mm.

The above billet 16 is heated to 700 ° C., inserted into a die having an inlet diameter of 85 mm, and subjected to warm extrusion to a diameter of 51 mm (extrusion ratio 2.78) to obtain a cross section as shown in FIG. An extruded material 20 was obtained. In FIG. 1B, 2
1 is an outer layer portion shifted from the capsule 11, and 22 is a core 1
A core portion 23 shifted from 2 is an intermediate layer portion of the magnet material formed by changing the powder material 13 into a solid material. Each of 16 combinations of capsule material and core material has 16
Table 1 shows the quality of the extruded material of each type of sample.

[0015]

[Table 1]

[0016] In Table 1, when the product quality column is marked with a circle, all of a plurality of samples of the same type are uniformly stretched as shown in FIG. At the boundary with the metal region adjacent to the metal layer, a metal layer in which both regions were fused was observed by microscopy, and it was found that the bonding between both regions was extremely strong.

Further, in Table 1, the products having good or bad products are marked with an “x”, and all of a plurality of samples of the same kind were cracked upon cooling after extrusion, and good products could not be obtained. is there.

In Table 1, when the product quality column is marked with a triangle, the extruded material did not crack, but one or both of the core and the capsule were extruded at the time of extrusion. It was squeezed out before the magnet alloy, and a uniform extruded material as shown in FIG. 1 (b) could not be obtained.

In Table 1, when the product quality column is marked with a circle, the extruded material does not crack and a uniform extruded material as shown in FIG. 1 (b) is obtained. According to the above, no alloy layer was found at the boundary between the MnAlC-based magnet alloy region and the metal region adjacent thereto.

The extruded material of the sample 1 was cut into an appropriate size, the outer layer portion 21 was removed by lathing, and a screw hole 24 was easily formed in the core portion 22 to obtain a product 25. Samples 5 and 14 could be processed into similar products.

Example 2 As shown in FIG. 2A, the same FeMnNi as in Example 1 was used.
The same MnAlC magnet alloy powder material 32 as in Example 1 was filled and sealed in a cylindrical capsule 31 made of a series alloy and having a diameter of 84 mm and a thickness of 5 mm, and was extruded in the same manner as in Example 1 into a billet. An outer layer 33 having an outer diameter of 51 mm and a core 34 having a diameter of 43 mm as shown in FIG.
An extruded material 35 was obtained. This was cut to an appropriate size as shown in FIG. 2C, and a thread 36 was cut on the peripheral surface to obtain a product 37. The outer layer 33 of this product 37 was bonded to the core 34 by an alloy layer.

Example 3 As shown in FIG. 3A, the same FeMnNi as in Example 1 was used.
The same MnAlC-based magnet alloy powder material 44 as in Example 1 is filled in a double capsule 43 made of a base alloy and composed of an outer cylinder 41 and an inner cylinder 42, and sealed to obtain a billet. The capsule 43 has an outer diameter of 84 mm, a center hole inner diameter of 50 mm, and an outer cylinder 41.
Was 1.6 mm, and the thickness of the inner cylinder 42 was 4.0 mm.

The above billet is heated to 70 ° C., and the inlet diameter is 8
It is extruded using a hot extruder having a diameter of 5 mm and a mandrel diameter of 21 mm, and as shown in FIG. 3B, the inner layer 44 having an outer diameter of 51 mm, an inner diameter of 22 mm, a thickness of 5 mm, and a middle layer 45 having a thickness of 8 mm. A tubular extruded material 47 comprising an outer layer 46 having a thickness of 1.5 mm was obtained. The inner layer 44, the middle layer 45, and the outer layer 46 were strongly bonded to each other by the alloy layer.

[0024]

As described above, according to the present invention,
Easy-to-work Mn is added to the solid MnAlC magnet alloy part.
Since the NiCu-based alloy or the FeMnNi-based alloy portion is firmly and integrally bonded via the alloy layer by diffusion, it is possible to easily mount, hold, etc. the MnAlC-based magnet by machining it. it can. Moreover, the production method employs a powdering method by gas atomization and a warm or hot extrusion method, both of which have good productivity, and therefore has an advantage of high productivity.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a billet according to a first embodiment of the present invention;
It is an extruded material longitudinal sectional view and an enlarged longitudinal sectional view of a machined product.

FIG. 2 is a longitudinal sectional view of a billet according to a second embodiment of the present invention;
It is an extruded material longitudinal sectional view and a partial longitudinal enlarged side view of a machined product.

FIG. 3 is a vertical sectional view of a billet and a vertical sectional view of an extruded material according to a third embodiment of the present invention.

[Explanation of symbols]

11, 31, 43 Capsule 12 Core 13, 32, 44 Magnet alloy powder material 20, 35, 47 Extruded product 21, 22, 33, 44, 46 FeMnNi alloy material 23, 34, 45 MnAlC magnet material

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H01F 7/02 H01F 7/02 E

Claims (6)

(57) [Claims] A plurality of solid metal materials parallel to a central axis are firmly joined to each other with a diffusion layer interposed between adjacent metal materials, and one of the metal materials is a MnAlC-based material transferred from powder. M is a magnet alloy material, wherein at least one of the other metal materials is a MnNiCu-based alloy material or a FeMnNi-based alloy material, and is joined adjacent to the MnAlC-based magnet alloy material.
nAlC composite magnet material. 2. The MnAlC-based magnet alloy material or F
The eMnNi-based alloy material has a cylindrical shape, and the M
The MnAlC-based composite magnet material according to claim 1, wherein the nAlC-based magnet alloy material is joined. 3. The MnAlC-based magnet alloy material has a cylindrical shape and contains therein the MnAlC-based alloy material or Fe.
The MnAlC-based composite magnet material according to claim 1, wherein the MnNi-based alloy material is joined. 4. A MnNiCu-based alloy or F is contained in a cylindrical capsule made of a metal having sufficient strength and malleability.
a MnAlC-based composite magnet characterized in that a tube or rod made of an eMnNi-based alloy and a powder material of a MnAlC-based magnet alloy by a gas atomization method are concentrically accommodated, and the capsule is sealed and subjected to hot or warm extrusion. Material manufacturing method. 5. The method for producing a MnAlC-based composite magnet material according to claim 4, wherein the metal layer transferred from the capsule existing on the surface of the extruded material obtained by the extrusion processing is removed. 6. A MnNiCu-based alloy or FeMnNi
A powdered material of a MnAlC-based magnet alloy by a gas atomization method is accommodated in a cylindrical capsule made of a base alloy in direct contact with the inner surface of the capsule, and the capsule is sealed and subjected to hot or warm extrusion. MnAl
A method for producing a C-based composite magnet material.