JP2008174814A - Amorphous metal molding and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anisotropic amorphous metal molding and its production method. <P>SOLUTION: The amorphous metal molding has a layered structure composed of layers, each of which is composed of a plurality of flat particles, wherein the flat particles are laid in a direction nearly parallel to the thickness direction and have an aspect ratio of 2 or greater. The method for producing the amorphous metal molding is for producing the amorphous metal molding which has a layered structure composed of layers, each of which is composed of a plurality of flat particles, wherein the flat particles are laid in a direction nearly parallel to the thickness direction and have an aspect ratio of 2 or greater; and comprises a step of disposing the amorphous metal powder and a step, subsequent to the former step, of molding the amorphous metal powder, while extending it. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an amorphous metal molded body and a method for producing the same, and more specifically, an amorphous amorphous material having a laminated structure in which predetermined particles are stacked in a layered manner with a predetermined directionality. The present invention relates to a metal molded body and a manufacturing method thereof.

  Conventionally, a molded body of amorphous metal has been obtained by a method of molding a metal powder once amorphized without crystallizing, or a method of quenching directly from a liquid (see Patent Documents 1 and 2).

The amorphous metal molded body obtained in this manner is isotropic in terms of crystallographic and structural characteristics. Therefore, when the magnetic field fluctuates in many directions, it is characterized by relatively little loss. is there.
However, when the magnetic field fluctuation repeats reversal in a uniaxial direction or rotates in the same plane, it cannot always be said that the material characteristics are sufficiently exhibited, and the efficiency is further improved in a specific direction, that is, different. There is a demand for a material having anisotropy.
In view of this, a method has been proposed in which scale-like particles obtained by pulverizing an amorphous metal ribbon are filled into a mold with the plane direction aligned and densified (see Patent Document 3).
Japanese Patent No. 3288571 Japanese Patent No. 3616512 JP 2000-345308 A

  However, in the method for producing an amorphous metal molded body described in Patent Document 3, it is difficult to fill a mold while aligning the orientation of powder obtained by pulverizing a ribbon, There are problems such as the orientation being disturbed by deformation during molding and the loss of the effect when the powders are completely fused together.

  This invention is made | formed in view of the subject which such a prior art has, and the place made into the objective is to provide the amorphous metal molded object which has anisotropy, and its manufacturing method.

  As a result of intensive studies to achieve the above object, the inventors of the present invention are amorphous metal molded bodies having a laminated structure formed by laminating a plurality of flat particles, and the flat particles are: The inventors have found that the object can be achieved by laminating in a direction substantially parallel to the thickness direction and having an aspect ratio of 2 or more, and have completed the present invention.

  That is, the amorphous metal molded body of the present invention is an amorphous metal molded body having a laminated structure in which a plurality of flat particles are stacked in layers, and the flat particles are substantially parallel to the thickness direction. The aspect ratio is 2 or more.

Further, the method for producing an amorphous metal molded body of the present invention is an amorphous metal molded body having a laminated structure in which a plurality of flat particles are stacked in layers, and the flat particles are in the thickness direction. Is an amorphous metal molded body having an aspect ratio of 2 or more, and includes the following steps (A) and (B).
(A) A step of arranging amorphous metal powder (B) A step that is performed after the step (A) and is formed while the amorphous metal powder is extended.

  According to the present invention, there is provided an amorphous metal formed body having a laminated structure formed by laminating a plurality of flat particles, and the flat particles are laminated in a direction substantially parallel to the thickness direction. In addition, since the aspect ratio is 2 or more, an amorphous metal molded body having anisotropy and a method for manufacturing the same can be provided.

Hereinafter, the amorphous metal molded body of the present invention will be described in detail.
As described above, the amorphous metal molded body of the present invention is an amorphous metal molded body having a laminated structure in which a plurality of flat particles are stacked in layers, and the flat particles are substantially in the thickness direction. They are stacked in parallel directions and have an aspect ratio of 2 or more.
By setting it as such a structure, it becomes an amorphous metal molded object which has anisotropy.

Here, the “aspect ratio” is the ratio of the major axis of the flat particles to the thickness of the flat particles.
The aspect ratio will be described in more detail with reference to the drawings.
FIG. 1 is a schematic explanatory view (a) and (b) of rod-like and disc-like flat particles. In the figure, the thickness of the flat particles is indicated by Y, and the major axis of the flat particles is indicated by X.
In the present invention, for the aspect ratio, the structure of the cross section of the amorphous metal compact was observed, the particle shape was observed with a scanning electron microscope (SEM), and the average value was applied.
In addition, such flat particles are easily formed in an amorphous metal molded body by deforming a spherical powder produced by a method such as water atomization or gas atomization through a process such as rolling, pressing, or forging. . The spherical powder is commercially available as a material for shot polishing and has a shape that can be easily manufactured industrially.

Further, an amorphous metal molded body having a laminated structure in which the flat particles as described above are stacked and formed will be described with reference to the drawings.
FIG. 2 is a schematic explanatory view (a) and (b) of an amorphous metal formed body having a laminated structure in which rod-like and disc-like flat particles are stacked in a layered manner. When the magnetic field is reversed in the direction of arrow A inside the amorphous metal molded body as shown in FIG. 5A, the demagnetizing factor can be reduced, the coercive force is small, and the soft magnetic property exhibits excellent permeability. It becomes a molded body.
The amorphous metal molded body as shown in FIG. 5A can be a soft magnetic molded body that can reduce the demagnetizing factor to ½ or less, has a small coercive force, and exhibits excellent magnetic permeability. For example, if the aspect ratio is 5 or more, the demagnetizing factor can be reduced to 1/10 or less, and if the aspect ratio is 10 or more, the demagnetizing factor can be reduced to 1/100 or less. However, if the aspect ratio exceeds 20, the fusion between the flat particles proceeds and the desired effect may not be obtained, so the aspect ratio is preferably 20 or less.
Moreover, such an amorphous metal molded body is obtained, for example, by arranging an amorphous metal powder and molding the amorphous metal powder while extending in a uniaxial direction.

On the other hand, the amorphous metal molded body as shown in FIG. 5B is a soft magnetic molded body that can reduce the demagnetizing coefficient when the magnetic field rotates in the direction of the arrow B, and exhibits excellent magnetic permeability. Become.
The amorphous metal molded body as shown in FIG. 2B is inferior to the amorphous metal molded body as shown in FIG. 1A, but the demagnetizing factor can be reduced and the magnetic permeability is excellent. It becomes a soft magnetic compact. For example, if the aspect ratio is 5 or more, the demagnetizing factor can be reduced to 1/3 or less, and if the aspect ratio is 10 or more, the demagnetizing factor can be reduced to 1/5 or less. For the same reason as described above, the aspect ratio is preferably 20 or less.
Moreover, such an amorphous metal molded body is obtained by, for example, arranging an amorphous metal powder, compressing the amorphous metal powder from a uniaxial direction, and forming it while extending.

In the amorphous metal molded body of the present invention, it is desirable that 50% by volume or more of the amorphous metal molded body is composed of the above-described flat particles, and 80% by volume or more of the amorphous metal molded body is the above-mentioned. It is more desirable to be composed of flat particles.
By setting it as such a structure, it becomes an amorphous metal molded object which has anisotropy.
Specifically, for example, when the aspect ratio of the flat particles is 5 or more, remarkably anisotropy is exhibited when the content is 50% by volume or more, and the aspect ratio of the flat particles is 2 In the case of the above, remarkably anisotropy is exhibited when the content is 80% by volume or more.

Furthermore, in the amorphous metal molded body of the present invention, it is desirable that the above-described flat particles have a coating containing a nonmagnetic material on the whole or a part of the surface thereof.
By setting it as such a structure, progress of fusion | melting of flat particle | grains can be suppressed, and it becomes an amorphous metal molded object which has anisotropy. Moreover, it becomes a soft-magnetic molded object which can reduce a demagnetizing factor more.
Examples of the nonmagnetic material include alumina, silica, and glass.
FIG. 3 is a schematic explanatory view showing an example of a structure in a cross section of the amorphous metal molded body of the present invention. As shown in the figure, the flat particles in the amorphous metal molded body have a coating containing a nonmagnetic material on the surface thereof.

Furthermore, in the amorphous metal molded body of the present invention, it is desirable that the above-mentioned flat particles have a coating containing an insulating material on all or part of the surface thereof.
By adopting such a configuration, it is possible to suppress the progress of fusion between the flat particles, improve the magnetic permeability, and reduce the generation of eddy currents. It becomes a low-loss soft magnetic molded body that can reduce the above.
Examples of the insulating material include oxides such as alumina and silica, and resin materials such as polyimide.

Usually, since the amorphous metal powder before molding is oxidized or contaminated, the amorphous metal powder is densified and molded at a low temperature (for example, less than 600 ° C.) below the crystallization start temperature. The surface is not completely fused, and the amorphous metal particles as described above remain in an identifiable state without etching treatment inside the amorphous metal molded body.
On the other hand, since the surface area of the amorphous metal powder increases and unavoidable fusion occurs when it is excessively deformed during densification molding, a film containing a non-magnetic material or a film containing an insulating material as described above is used. By using the amorphous metal powder which has, it can suppress that flat particle | grains melt | fuse together completely and lose | eliminate a shape effect.

Next, the method for producing an amorphous metal molded body of the present invention will be described in detail.
As described above, the method for producing an amorphous metal molded body according to the present invention is an example of the method for producing the amorphous metal molded body according to the present invention, and includes (A) a step of arranging amorphous metal powder, and (B) the above ( A) is performed after the step, and includes forming the amorphous metal powder while stretching.
By adopting such a production method, an amorphous metal molded body having the above-described anisotropy can be obtained.

Moreover, in the manufacturing method of the amorphous metal molded body of this invention, it is desirable to use the amorphous metal powder whose aspect ratio is 1-1.5 as a main raw material in (A) process.
By adopting such a manufacturing method, the amorphous metal powder before the extension in the step (B) has an isotropic shape. By aligning the directions, the orientation of the flat particles can be easily aligned, and an amorphous metal molded body having anisotropy can be obtained. Moreover, it becomes a soft-magnetic molded object which can reduce a demagnetizing factor more.
Here, the “main raw material” means 50% by volume or more in the volume ratio of the whole amorphous metal powder.
Furthermore, when the volume ratio is 50% by volume, it may be difficult to make the particle shape anisotropic unless the amount of deformation is increased, and a large-scale apparatus is required for the production of large-sized products. The volume ratio of the metal powder is more preferably 80% by volume or more.
If the aspect ratio of the amorphous metal powder is more than 1.5, it may be necessary to consider the orientation, amount, and orientation when supplying the powder.

  In addition, the amorphous metal powder used in the present invention is not particularly limited, but it is preferable to use an amorphous iron-based alloy that has a large saturation magnetization and can secure a wide forming temperature region ΔT (= Tx−Tg). However, Tx shows crystallization start temperature and Tg shows glass transition temperature.

Furthermore, in the method for producing an amorphous metal molded body of the present invention, in the step (B), the amorphous metal powder is stretched uniaxially at a temperature not lower than the glass transition temperature and lower than the crystallization start temperature, Next, it is desirable to cool the glass transition temperature to a temperature of −100 ° C. or lower.
By adopting such a manufacturing method, since the amorphous metal powder is molded in the superplastic region, the flat particles having the aspect ratio as described above can be easily formed, and the anisotropy is reduced. An amorphous metal formed body can be obtained.
In the step (B), for extending the amorphous metal powder, for example, rolling molding or press molding can be applied, but it goes without saying that the present invention is not limited thereto. That is, it can be formed by forging.
In heating the amorphous metal powder, for example, the amorphous metal powder may be supplied by heating, or the temperature of the rolling roll or the mold may be kept at the heating temperature.

  FIG. 4 is an explanatory view showing an outline of an example of a method for producing an amorphous metal molded body of the present invention. As shown in the figure, an amorphous metal powder is placed on a substrate, and the amorphous metal powder is formed while being extended by a rolling roll.

Furthermore, in the method for producing an amorphous metal molded body of the present invention, the step (A) and the step (B) can be repeated twice or more in this order.
By adopting such a manufacturing method, the heating area and the amount of heat input can be reduced. When a large amount of powder is molded at once, the desired deformation does not occur due to friction between the powders, and the molded body. Since progress of crystallization due to insufficient cooling inside can be avoided, a large molded body can be produced with almost no crystallization region.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

(Example 1)
[Production of amorphous metal powder]
First, after weighing a predetermined amount of iron (Fe), gallium (Ga), boron (B), silicon (Si), iron (Fe) -carbon (C) alloy, iron (Fe) -phosphorus (P) alloy, was dissolved in argon (Ar) gas using a high frequency melting furnace, the composition was prepared an ingot of _{Fe 76 Ga 4 P 9.5 C 4} B 4 Si 2.5.
This ingot was dissolved in an Ar atmosphere under reduced pressure (10 ⁻⁵ Pa) and sprayed with Ar gas to perform gas atomization. As a result of X-ray analysis, it was found that the amorphous metal powder was rapidly cooled.
The obtained amorphous metal powder was classified using a sieve so that the particle size was 20 to 300 μm.
Further, the glass transition temperature and the crystallization start temperature of the obtained amorphous metal powder are increased by a differential scanning calorimetry (DSC analysis) at a rate of temperature increase of 10 ° C./min in an Ar gas flow using a platinum crucible. Determined by warming and measuring. As a result, the glass transition temperature was about 460 ° C., and the crystallization start temperature was about 515 ° C. Furthermore, the aspect ratio of the obtained amorphous metal powder was 1.0 to 1.3 (average: 1.1). Since the range of variation between the glass transition temperature and the crystallization start temperature is 10 ° C., about is added before the temperature.

[Production of amorphous metal compact]
Next, 30 g of the obtained amorphous metal powder was preliminarily heated to 500 ° C. Carbon steel plate (plate thickness: 5 mm, width: 80 mm, length: 200 mm, surface treatment: release agent (nitrogen boride (BN)) spray coating Finished) was placed so as to have a thickness of about 5 mm and a width of about 15 mm, then inserted into an electric resistance furnace at 500 ° C. and heated to the target temperature in about 3 minutes.

Next, the heated amorphous metal powder is rolled together with a carbon steel plate by a four-high rolling mill (rolling speed: 30 mm / second, number of passes: 3 times, rolling load at the end: 20 MPa or less), and immediately after the rolling, water-cooled, An amorphous metal molded body of this example was obtained (thickness: about 1 mm, width: about 20 mm, length: about 180 mm).
Here, the roll gap in the roll of the four-high rolling mill was 4.95 mm, and the roll was preheated by blanking only a carbon steel sheet at 500 ° C. 10 times in advance. In addition, a release agent was sufficiently applied to the roll side in advance so that the powder did not burn onto the roll.

  In the obtained amorphous metal molded body, the structure of the cross section parallel to the rolling longitudinal direction was observed with a scanning electron microscope (SEM). For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the longitudinal direction were measured, and the aspect ratio was calculated from the average of these.

Further, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was cut out so that the rolling longitudinal direction was the magnetization direction.
The magnetization of the obtained test piece was measured with a vibrating sample magnetometer (VSM). At that time, the magnetization direction was made to be the rolling longitudinal direction. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Example 2)
[Production of amorphous metal compact]
A carbon steel plate (plate thickness: 5 mm, width: 80 mm, length: 200 mm, surface treatment: release agent (nitrogen boride ( BN)) spray-coated), on which 30 g of the amorphous metal powder obtained in Example 1 is dispersed and placed so that the thickness is about 5 mm and the width is about 15 mm, and then 500 ° C. And heated to the target temperature in about 4 minutes.

Next, the heated amorphous metal powder and the amorphous metal compact are rolled together with the carbon steel plate by a four-stage rolling mill (rolling speed: 30 mm / second, number of passes: 5 times, rolling load at the end: 20 MPa or less), and after rolling Immediately water cooling was performed to obtain an amorphous metal molded body of this example (thickness: about 1.8 mm, width: about 20 mm, length: about 180 mm).
Here, the roll gap in the roll of the four-high rolling mill was 4.85 mm, and the roll was preheated by blank rolling only a 500 ° C. carbon steel sheet 10 times in advance.

  In the obtained amorphous metal molded body, the structure of a cross section parallel to the rolling longitudinal direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the longitudinal direction were measured, and the aspect ratio was calculated from the average of these.

Further, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was cut out so that the rolling longitudinal direction was the magnetization direction. In addition, both sides were wet-polished so that plate | board thickness might be set to 1 mm from the center part.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was made to be the rolling longitudinal direction. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Example 3)
[Production of amorphous metal compact]
Carbon steel plate (plate thickness: 5 mm, width: 80 mm, length: 200 mm, surface treatment: release agent (nitrogen boride (BN)) sprayed in advance to 500 ° C. from 30 g of the amorphous metal powder obtained in Example 1 (Applied) and dispersed so as to have a thickness of about 5 mm and a width of about 15 mm, and then inserted into an electric resistance furnace at 500 ° C. and heated to the target temperature in about 3 minutes.

Next, the heated amorphous metal powder is rolled together with a carbon steel plate by a four-high rolling mill (rolling speed: 30 mm / second, number of passes: 3 times, rolling load at the end: 20 MPa or less), and immediately after the rolling, water-cooled, An amorphous metal molded body was obtained (thickness: about 1 mm, width: about 20 mm, length: about 180 mm).
Here, the roll gap in the roll of the four-high rolling mill was 4.95 mm, and the roll was preheated by blanking only a carbon steel sheet at 500 ° C. 10 times in advance.

Next, a carbon steel plate (plate thickness: 5 mm, width: 80 mm, length: 200 mm, surface treatment: release agent (boration), which was obtained by cutting the length of the obtained amorphous metal molded body to 100 mm and heating it again to 500 ° C. Nitrogen (BN) spray-coated), held for 1 minute, and heated amorphous metal compact with carbon steel plate is rolled by a four-high mill (rolling speed: 30 mm / second, number of passes: 3 times, when finished) (Rolling load: 20 MPa or less), and immediately after the rolling, the product was cooled with water to obtain an amorphous metal molded body of this example (thickness: about 0.7 mm, width: about 20 mm, length: about 140 mm).
Here, the roll gap in the roll of the four-high rolling mill was 4.85 mm, and the roll was preheated by blank rolling only a 500 ° C. carbon steel sheet 10 times in advance.

  In the obtained amorphous metal molded body, the structure of a cross section parallel to the rolling longitudinal direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the longitudinal direction were measured, and the aspect ratio was calculated from the average of these.

Further, in the obtained amorphous metal molded body, a test piece (thickness: about 0.7 mm, diameter: 5 mm) was cut out so that the longitudinal direction of rolling was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was made to be the rolling longitudinal direction. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

Example 4
[Production of amorphous metal compact]
As a press mold, a hard metal mold (molded surface shape is 10 mm square) was prepared.
FIG. 5 is a top view (a) and a half sectional view (b) of a cemented carbide die for press molding. As shown in FIG. 1, the cemented carbide die 10 includes a punch 12, a die 14, and a split die 16. Reference numeral 1 denotes a molded body.
First, the mold was heated to 500 ° C. in an electric resistance furnace, the mold was filled with 0.5 g of the amorphous metal powder obtained in Example 1, held again in the furnace for 1 minute, and heated to 500 ° C. did.
After taking out the mold from the furnace, it was immediately press-formed with a press at a load of 980 MPa, and the same operation was repeated 8 times to obtain an amorphous metal formed body of this example (thickness: about 4 mm).

  In the obtained amorphous metal molded body, the structure of the cross section parallel to the thickness direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the direction parallel to the press surface were measured, and the aspect ratio was calculated from the average of these.

Moreover, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was produced by electric discharge machining and polishing so that the direction parallel to the press surface was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was set to be parallel to the press surface. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Example 5)
[Production of amorphous metal powder]
The amorphous metal powder obtained in Example 1 is coated with 5 mL of polysizaran solution (manufactured by Aquamica) per 10 g, dried with a drier, and held at 100 ° C. for 1 hour to have a silica (SiO ₂ ) coating. An amorphous metal powder was obtained.

[Production of amorphous metal compact]
Except for using the obtained amorphous metal powder with a silica coating, the same operation as the production of the amorphous metal molded body of Example 4 was repeated to obtain the amorphous metal molded body of this example.

  In the obtained amorphous metal molded body, the structure of the cross section parallel to the thickness direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the direction parallel to the press surface were measured, and the aspect ratio was calculated from the average of these.

Moreover, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was produced by electric discharge machining and polishing so that the direction parallel to the press surface was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was set to be parallel to the press surface. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Example 6)
[Production of amorphous metal powder]
The amorphous metal powder obtained in Example 1 was spray-coated with a polyimide varnish, allowed to stand for 1 hour, and then held at 200 ° C. for 2 hours to obtain an amorphous metal powder having a polyimide coating.

[Production of amorphous metal compact]
5 g of the obtained amorphous metal powder with polyimide coating was sandwiched between two carbide discs (plate thickness: 10 mm, diameter: 50 mm) preheated to 460 ° C. and held at 460 ° C. for 3 minutes, and then pressed The amorphous metal molded body of this example was obtained by press molding with a machine at a load of 980 MPa from the top and bottom of the carbide disc.
Here, the initial amorphous metal powder with polyimide coating was placed as uniformly as possible in a range of about 20 mm in diameter in a carbide disc.

  In the obtained amorphous metal molded body, the structure of the cross section parallel to the thickness direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the direction parallel to the press surface were measured, and the aspect ratio was calculated from the average of these.

Further, in the obtained amorphous metal molded body, a test piece (thickness: 0.5 mm, diameter: 5 mm) was cut out so that the direction parallel to the press surface was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was set to be parallel to the press surface. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Example 7)
[Production of amorphous metal compact]
Using the amorphous metal powder with polyimide coating obtained in Example 6 and changing the heating temperature to 460 ° C., the same operation as the production of the amorphous metal molded body of Example 1 was repeated, and the amorphous metal molding of this example was performed. Got the body.

  In the obtained amorphous metal molded body, the structure of a cross section parallel to the rolling longitudinal direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the longitudinal direction were measured, and the aspect ratio was calculated from the average of these.

Further, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was cut out so that the rolling longitudinal direction was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was made to be the rolling longitudinal direction. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Example 8)
[Production of amorphous metal compact]
The amorphous of Example 1 except that the amorphous metal powder obtained in Example 1 and the amorphous metal powder with silica coating obtained in Example 5 were mixed at a weight ratio of 1: 1. The same operation as the production of the metal molded body was repeated to obtain an amorphous metal molded body of this example.

  In the obtained amorphous metal molded body, the structure of a cross section parallel to the rolling longitudinal direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the longitudinal direction were measured, and the aspect ratio was calculated from the average of these.

Further, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was cut out so that the rolling longitudinal direction was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was made to be the rolling longitudinal direction. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Comparative Example 1)
[Production of amorphous metal compact]
5 g of the amorphous metal powder obtained in Example 1 was filled in the mold used in Example 4, and molded by discharge plasma sintering (molding temperature: 500 ° C., molding pressure: 200 MPa). A metal compact was obtained.

  In the obtained amorphous metal molded body, the structure of the cross section parallel to the thickness direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the direction parallel to the press surface were measured, and the aspect ratio was calculated from the average of these.

Moreover, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was produced by electric discharge machining and polishing so that the direction parallel to the press surface was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was set to be parallel to the press surface. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Comparative Example 2)
[Production of amorphous metal powder]
The amorphous metal ingot obtained in Example 1 was melted in an Ar atmosphere under reduced pressure (10 ⁻⁵ Pa), and an amorphous metal ribbon having a thickness of about 0.05 μm was obtained by a quenching ribbon method. Manufactured.
The obtained ribbon was pulverized with a hammer, and an amorphous metal powder having a particle size of 200 μm or less was selected with a sieve.

  Using the amorphous metal powder obtained in Comparative Example 2, the metal mold used in Example 4 was filled and molded by discharge plasma sintering (molding temperature: 500 ° C., molding pressure: 200 MPa). An amorphous metal compact was obtained.

  In the obtained amorphous metal molded body, the structure of the cross section parallel to the thickness direction was observed by SEM. For 30 arbitrary particles, the particle size (minor axis length) in the thickness direction and the particle size (major axis length) in the direction parallel to the press surface were measured, and the aspect ratio was calculated from the average of these.

Moreover, in the obtained amorphous metal molded body, a test piece (thickness: 1 mm, diameter: 5 mm) was produced by electric discharge machining and polishing so that the direction parallel to the press surface was the magnetization direction.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was set to be parallel to the press surface. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.

(Comparative Example 3)
[Production of amorphous metal compact]
The amorphous metal ribbon obtained in Comparative Example 2 was used as the amorphous metal formed body of this example.

The obtained amorphous metal molded body was coated with an epoxy resin on its surface to prevent cracking, and then punched with a press punching machine having an inner diameter of 5 mm to prepare a test piece.
The magnetization of the obtained test piece was measured by VSM. At that time, the magnetization direction was made to be the longitudinal direction of the ribbon. A magnetic field was applied up to 5000 A / m, and the magnetic flux densities B ₁₀ and B ₅₀₀₀ and the maximum permeability were measured. Permeability was expressed in terms of relative permeability μ _r.
Table 1 shows the specifications of the amorphous metal molded body of each of the above examples. Table 2 shows the specifications of the method for producing the amorphous metal molded body of each example.

  From Table 1, the amorphous metal molded bodies having anisotropy of Examples 1 to 8 belonging to the scope of the present invention have a small coercive force and excellent permeability compared to Comparative Examples 1 to 3 outside the present invention. It turns out that it is a soft-magnetic molded object which shows.

It is typical explanatory drawing (a) and (b) of rod-shaped and disk-shaped flat-shaped particle | grains. It is typical explanatory drawing (a) and (b) of the amorphous metal molded object which has the laminated structure formed by laminating | stacking rod-shaped and disk-shaped flat particle | grains in layers. It is typical explanatory drawing which shows an example of the structure | tissue in the cross section of the amorphous metal molded object of this invention. It is explanatory drawing which shows the outline | summary of an example of the manufacturing method of the amorphous metal molded object of this invention. It is the top view (a) and half-sectional view (b) of the superhard metal mold | die for press molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Amorphous metal compact 10 Carbide mold 12 Punch 14 Die 16 Split mold

Claims (9)

An amorphous metal molded body having a laminated structure formed by laminating a plurality of flat particles in layers,
The amorphous metal molded body, wherein the flat particles are laminated in a direction substantially parallel to the thickness direction and have an aspect ratio of 2 or more.   2. The amorphous metal molded body according to claim 1, wherein 50% by volume or more of the amorphous metal molded body is composed of the flat particles.   The amorphous metal formed body according to claim 1 or 2, wherein the flat particles have a coating containing a nonmagnetic material on all or a part of the surface thereof.   The amorphous metal molded body according to any one of claims 1 to 3, wherein the flat particles have a coating containing an insulating material on all or a part of the surface thereof. An amorphous metal molded body having a laminated structure formed by laminating a plurality of flat particles in layers,
The flat particles are laminated in a direction substantially parallel to the thickness direction and have an aspect ratio of 2 or more, which is a method for producing an amorphous metal molded body, comprising the following steps (A) and ( B)
(A) arranging the amorphous metal powder;
(B) a step that is performed after the step (A) and is formed while the amorphous metal powder is stretched;
A method for producing an amorphous metal molded body comprising:   In the said (A) process, the amorphous metal powder whose aspect-ratio is 1-1.5 is used as a main raw material, The manufacturing method of the amorphous metal molded object of Claim 5 characterized by the above-mentioned.   In the step (B), the amorphous metal powder is stretched in a uniaxial direction at a temperature not lower than the glass transition temperature and lower than the crystallization start temperature, and then the glass transition temperature is −100 ° C. or lower. It cools, The manufacturing method of the amorphous metal molded object of Claim 5 or 6 characterized by the above-mentioned.   In the said (B) process, in extending the said amorphous metal powder, rolling shaping | molding or press molding is carried out, The manufacturing method of the amorphous metal molded object as described in any one of Claims 5-7 characterized by the above-mentioned.   The method for producing an amorphous metal molded body according to any one of claims 5 to 8, wherein the step (A) and the step (B) are repeated twice or more in this order.

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