JPS61223103A - Production of amorphous structural body - Google Patents

Abstract

PURPOSE:To produce a three-dimensional amorphous metallic structural body by adding a binder to amorphous metallic powder obtd. by ultra-quick cooling of a molten metal and subjecting the powder to compaction to a desired shape then heating the molding to the glass transition temp. or below in a non- oxidizing atmosphere. CONSTITUTION:The metal or alloy in a molten state is discharged from a nozzle in the non-oxidizing atmosphere where a cryogenic fluid such as liquid air or liquid nitrogen is sprayed to cool ultra-quickly the molten metal or alloy and the pulverous amorphous powder is produced. The metallic powder or metallic oxide powder having the smaller grain size is further added and mixed at <=10wt% to and with such power of the amorphous metal or alloy with a thermosetting resin such as epoxy resin, urea resin or melamine resin as a binder. The mixture is packed into a metallic mold and is molded to a desired three-dimensional green compact molding. The molding is heated at the temp. below the glass transition temp. of the amorphous metal in the non-oxidizing atmosphere of gaseous hydrogen, etc., by which the amorphous metallic structural body having the three-dimensional shape is produced.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing an amorphous structure.

Generally, an amorphous material becomes amorphous when a molten metal is rapidly cooled to a temperature higher than a critical temperature because the regularization of the K-polyatomic arrangement is inhibited. This amorphous material does not have a long-period atomic arrangement like crystalline materials, and is characterized by a lack of regularity like liquid metals, and has poor corrosion resistance, strength, and magnetic properties. It is attracting attention as an excellent material.

Conventionally, methods for manufacturing this amorphous material include, for example, (
1) A splat cooling method in which molten metal is dropped between metal plates arranged in parallel, and the molten metal is quickly cooled by being squeezed between the two metal plates to form an amorphous metal piece. (2) A bath molten metal is dropped between metal plates. (3) Drop rolling method in which the metal is rapidly cooled and rolled between two rolls to create an amorphous metal piece, and (3) molten metal is injected with a nozzle onto the inner wall surface of a rapidly rotating drum to form a linear or amorphous metal piece. Examples include the rotating drum method for producing cancer-like amorphous materials.

However, the above splat cooling method.

The amorphous material obtained by the drop rolling method is in the form of a piece, and the material obtained by the rotating drum method is also flat or linear, so it has a three-dimensional shape. It has not been possible to manufacture structures and it has not been put into practical use despite having excellent properties.

In view of this, the present invention rapidly cools molten metal to form an amorphous powder, adds a binder to this powder of 10% or less by weight, and then compacts the powder into a desired shape, and subsequently forms a glass of the amorphous powder. The object of the present invention is to provide a method for producing a three-dimensional amorphous structure having extremely high AK strength by heating below the transition temperature.

The present invention will be explained in detail below.

The method of the present invention consists of a first step of forming an amorphous powder, and a second step of adding 10 weight percent or less of a binder to this powder, compacting it into a desired shape, and then heating it.

To explain the first step, for example, while the molten metal is flowing down from a nozzle installed in a non-oxidizing atmosphere, the molten metal is made fine by spraying a cryogenic liquid radially from the side of the nozzle. At the same time, it is rapidly solidified to obtain an amorphous powder in which the atomic arrangement is prevented from becoming regular.

The metal in this amorphous state may be any commonly used structural material, magnetic material, etc., and its material is not limited. Examples of cryogenic liquids used to rapidly cool and spray molten metal include liquid air, liquid oxygen, and liquid nitrogen. The particle size of the resulting fine powder can be adjusted. By this rapid cooling, it is possible to obtain an amorphous powder on the order of μm.

Next, the second step of heating the amorphous powder will be described. The amorphous powder to which the binder has been added is filled into a mold and compacted into a desired three-dimensional structure according to a conventional method. Examples of this binder include amorphous powder, which is the main component, metal powder with fine particle size, that is, a large surface area, metal oxide powder, or thermosetting resin such as epoxy resin, urea resin, melamine resin, and phenol resin. It will be done. The reason why the amount of the binder added is limited is because if the amount added exceeds 10% by weight, the properties of the amorphous material will be impaired, and especially when producing a magnetic material, the magnetic properties will be reduced. It is.

The amorphous powder obtained by rapid cooling has a particle size on the order of 1 μm μm, and is compacted without using a binder and heated below the glass transition temperature of the amorphous powder. An amorphous structure having practically sufficient properties can be manufactured.

Furthermore, by adding a binder to the minimum necessary amount, mechanical properties etc. can be improved without impairing the properties of the amorphous material. In particular, magnetic properties etc. can be improved by adding an insulating binder such as a metal oxide or resin.

Next, the compacted powder having the desired shape obtained by the above method is heated to a temperature below the glass transition temperature (crystallization temperature) of the amorphous powder in a non-oxidizing atmosphere such as hydrogen gas, and three-dimensional An amorphous structure having a similar structure can be obtained.

Next, examples of the present invention will be described.

Example 1 A composition consisting of 5i15 atoms, BIO atoms, and the remainder Co was melted and homogenized in a high-frequency induction furnace, and then the molten metal was injected through a nozzle made by A00 with a diameter of 1.0 mm. At the same time, liquid nitrogen is sprayed radially at a pressure of 10 atmospheres from a fluid spray nozzle located 10 degrees below the nozzle to pulverize the molten metal and rapidly solidify it to form an amorphous metal. powder was obtained. When the average particle size of this powder was examined, it was found to be 10 to 13 μm, and it did not show any diffraction peaks and was in an amorphous state.

Next, this amorphous powder (Co-81-B amorphous powder)
85 parts by weight of Co with an average particle size of 0.1 m or less.

After stirring and mixing with 15 parts by weight of powder, molding was performed using a molding method.
Pressure gaff, compacted at 0 tons/d, diameter 10 φ,
A cylindrical green compact with a height of 10 cm was produced. Next, this green compact was heated at 350'CK5 in a dehydrating hydrogen atmosphere with a dew point of -65℃.
A columnar amorphous structure was obtained by heating for a period of time.

Reference Example Only the Co-8i-B amorphous powder used in Example 1 was compacted in the same manner as in Example 1 to produce a prismatic compact. Subsequently, this green compact was heated at 320° C. for 5 hours in a hydrogen atmosphere to obtain a cylindrical amorphous structure.

The hardness of the obtained structures of Example 1 and Reference Example was measured. As a result, the structure of Example 1 exhibited a Vickers hardness of Hv=770, and the structure of Reference Example (Hv
= 780). For comparison purposes, the heating conditions in Example 1 were changed to 850°C.
When the hardness of the structure obtained by crystallizing the powder for 5 hours was measured in the same manner, the hardness was only 173 or less compared to the structure of Example 1, which had an H value of 220.

- Also, the structure of Example 1 was denser than the structure of Reference Example.

Example 2 5 parts by weight of epoxy resin was added as a binder to 95 parts by weight of Co-St-B amorphous powder used in Example 1.
The weight parts were stirred and mixed, and the mixed powder was molded in a mold to obtain a ring-shaped green compact having an outer diameter of 50 φ, an inner diameter of 40 φ, and a height of 101 m. Next, this green compact was heated to 320° C. for 5 hours in a hydrogen stream.

An amorphous structure for a magnet was obtained.

The magnetic properties of the thus obtained structure were investigated and found to be magnetic permeability (μwax) = 58,000 to 6.
5000, coercive force (He) = 0.05~o, os(
o・), and commonly used soft magnetic materials have magnetic permeability of 4.
0,000 or more and coercive force of 0.1 (0.) or less, it was recognized that the magnetic properties were excellent.

As explained above, according to the method for manufacturing an amorphous structure according to the present invention, an amorphous powder is manufactured by rapidly cooling a molten metal, and a binder is added to the amorphous powder, the powder is compacted, and the powder is heated at a predetermined temperature. By heating the material, we can overcome the drawbacks of conventionally only being able to obtain amorphous material in the form of flakes, ridges, or lines, and create an amorphous structure with a strong three-dimensional structure. It is particularly effective in the production of magnetic materials that require excellent magnetic properties and hardness.

In addition, conventionally, with the redenant amorphous material, only a toroidal-shaped magnetic core could be obtained, but the present invention allows the core to be formed into any shape.

Claims (1)

[Claims] The molten metal is rapidly cooled to form an amorphous powder, a binder is added to this amorphous powder in an amount of 10% by weight or less, and then compacted into a desired shape, and then the amorphous powder is heated at a temperature below the glass transition temperature of the amorphous powder. A method for producing an amorphous structure, the method comprising heating.