JPH0475302B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is directed to the production of amorphous amorphous alloy powder (hereinafter abbreviated as amorphous aluminium powder) having a theoretical density or a density close to it, and a desired thickness. The present invention relates to a method for molding, for example, a plate-shaped three-dimensional molded article (for example, a plate-shaped three-dimensional molded article having a desired thickness is abbreviated as a three-dimensional molded article herein). More specifically, amorphous has excellent physical properties. Although it has chemical properties, it is often obtained in the form of powder and granules because it is produced by intense cooling. However, powder and granular materials are subject to restrictions in the field of use. The present invention is characterized by the excellent physical properties of amorphous amorphous. The present invention relates to a method for forming amorphous amorphous powder into a three-dimensional molded product without impairing its chemical properties.

[Prior art] Methods of placing powder in a container and rolling it are disclosed in Japanese Patent Publication No. 1323-1983, Japanese Patent Publication No. 41521-1987, and Japanese Patent Publication No. 41521-1983.
-58289 and Japanese Unexamined Patent Publication No. 56-45289 are known. In other words, these materials are made by loading the powder into a metal container, heating it as is or after sintering it, then heating it to a high temperature that facilitates sintering of the powder and reduces the deformation resistance of the powder and container, followed by hot rolling and shaping. Therefore, in these methods, even if the strength of the container is very high, it is sufficient and the compact can be obtained efficiently, but in this method, the powder is heated to a high temperature, so has excellent physical properties. It is not suitable because chemical properties may be lost. A method of impact-bonding amorphous alloy powder has also been disclosed (for example, Japan Institute of Metals Lecture Abstracts, October 1984, p. 541).
It uses the impact of bullet collisions and the explosive power of gunpowder, and there are many problems with its industrial use, such as environmental issues and restrictions on the dimensions of the molded product.

[Problems to be Solved by the Invention] The present invention has excellent physical properties due to the characteristics of the microstructure. The purpose is to mold amorphous powder particles with chemical properties into three-dimensional molded products on an industrial scale while maintaining their excellent physical properties.
Patent Application No. 61-294664 was filed by the applicant in December 1986.
This is a patent application filed on April 12th for a method for forming three-dimensional molded objects from powder, foil, and thin wire. That is, Japanese Patent Application No. 61-294664 discloses that after embedding powder, granular material, foil, thin wire, etc. in a metal container with sufficient strength to withstand molding, the metal container is heated to a temperature at which the properties of the embeddings are maintained. This is a method of forming built-in particulate matter, foil, or thin wire into a three-dimensional molded object by forcibly rolling it, and an amorphous powder or granule material is molded into a three-dimensional molded object by this method. This patent application provides a method suitable for industrially implementing the present invention regarding amorphous powder and granules.

[Means for Solving the Problems] The present invention includes a forming process of continuously bending a metal strip into a tubular shape, a welding process of continuously joining the ends of the bent metal band, and a welding process. a filling step of continuously filling the amorphous amorphous alloy powder into a metal tube formed by the method; and a heating step of heating the metal tube containing the amorphous aluminous alloy powder to just below the crystallization temperature of the amorphous amorphous alloy. , a method for forming an amorphous alloy powder comprising a rolling step of rolling the heated body to form a three-dimensional amorphous alloy compact from the amorphous alloy powder contained therein.

FIG. 1 is a diagram showing an example of the forming process, welding process, and filling process of the present invention.

1 is a metal band, which is formed into a tubular shape by forming rolls 2; The metal strip is a metal strip having sufficient strength in the rolling process of the present invention, and for example, austenitic stainless steel is preferred because of its high strength. The ends of the metal strip formed into a tubular shape are welded by a welding machine 3 to form a metal tube. As a welding method, for example, electron beam welding is preferable because it has a small thermal effect on the base metal and produces an excellent welded part. For example, if the metal strip is made of austenitic stainless steel and the welding method is electron beam welding, no heat treatment is required after welding as there is no decrease in toughness, but if necessary, heat treatment appropriate for the welded area should be applied immediately after welding. . In FIG. 1, 4 is an amorphous amorphous powder tank, 5 is a supply pipe, and the amorphous amorphous powder 6 is supplied from the front side of the welded part and filled into the welded metal pipe 7 at the rear face of the welded part. FIG. 1 shows an example of filling the amorphous amorphous granules 6 through the supply pipe 5, and this filling method is preferable because the amorphous granules are not affected by heat from the welding machine 3. .

The packing density of amorphous amorphous powder in a metal tube is
For example, the feed rate from the amorphous powder tank,
The level 6-1 of the amorphous powder in the metal tube is controlled to uniformly fill the entire length of the metal tube. The level 6-1 of the amorphous amorphous powder can be detected from outside the metal tube using, for example, a gamma ray sensor, and if a high packing density is desired, slight vibrations may be applied to the metal tube from the outside.

FIG. 2 is a diagram showing the rolling process of the present invention.

In the present invention, amorphous amorphous powder 6 is placed in a metal tube 7 having a sufficiently large wall thickness and high strength, and rolling is performed together with the metal tube. At this time, the metal tube is plastically deformed as the contents are expanded by rolling down.
The deformation resistance of the metal tube is greater than the deformation resistance of built-in objects. Metal tubes have high strength and malleability, and therefore require a large rolling force during rolling, which results in densification of the amorphous powder particles contained therein.

Since the built-in contents are restrained by the metal tube, they are forcibly bitten into the roll. When the internal components are bitten, pressure is generated that tends to push them back, but the metal tube must have the strength to resist deformation against this pressure. Failure to engage due to the flow of built-in materials is prevented by sealing the end of the metal tube.

Rolling is performed at a temperature just below the crystallization temperature. For example, amorphous Fe79, Si8B13 (at % Fe: 79, Si:
8, B: 13) The powder made from alloy foil is rolled at a temperature just below its crystallization temperature of 520°C. This temperature is lower than normal sintering and hot rolling temperatures. When molded at this temperature, the excellent physical and chemical properties of amorphous amorphous are maintained without loss. However, if kept near the crystallization temperature for a long time, the excellent properties of the built-in material (amorphous alloy) may be lost. Therefore, as a heating means, for example, a hot bath is preferable because it can rapidly heat the material, and it is also desirable to rapidly cool the material after rolling for the same reason.

The amorphous amorphous powder or granule in the present invention refers to an amorphous amorphous powder or granule that is an alloy of a metal and a metalloid, or a metal and a metal, and is mainly produced by a melt quenching method.
In alloys of metals and metalloids, when the metal cools, it becomes Fe,
One or more of Co, Ni, Cr, Mo, V, Nb, Zr, Ti, etc., semimetals are B, Si, C, P, Ge
One or more of the following. In the case of metal-metal alloys, examples of metal combinations include Fe-Ti,
Examples include Fe-Zr and Cu-Ti.

Melt quenching methods include atomization method, cavitation method, which can directly produce amorphous amorphous powder and granules.
There are submerged spraying methods and plasma spraying methods. Amorphous powder or granules can also be obtained by producing ribbons or wires and then pulverizing them with a ball mill or the like.

[Function] In the present invention, amorphous amorphous powder is incorporated into the metal tube. Since the metal tube is a cylindrical container, the packing density of the granular material can be significantly increased by densification compression, which will be described later. The flat shape indicated by the dotted line in FIG. 3A is a shape obtained by compressing the circle indicated by the solid line vertically to a height of 1/2 of the diameter without changing the circumference. In this case, the area of the flat shape is approximately the area of the circle.
68%, this compression reduces the area by about 32%.

The dotted line rectangle in Figure 3B is a solid line square compressed vertically to 1/2 of its height without changing its perimeter, and the rectangle's area is 75% of the square's area.
This compression reduces the area by 25%. In the present invention, prior to rolling, densification compression is performed to compress the metal tube in the vertical direction in order to increase the packing density of the built-in components. Due to this densification and compression, the cross-sectional shape of the metal tube changes from the circular shape shown in Figure 3A to a flattened shape, but at this time the packing density increases (the cross-sectional area decreases).
is a metal container with another shape, for example, a third cross-sectional shape.
It is larger than the square metal container shown in Figure B, and therefore the metal tube of the present invention is larger than other shaped metal containers.
Suitable for increasing the packing density of amorphous amorphous powder during compaction.

Since the metal container of the present invention is a metal tube with a circular cross section and no corners, the cross section is filled with amorphous powder at a uniform density. In addition, since it is a long metal container, for example, densification compression is performed by rolling, which is efficient.Also, since it is a long product, rolling of the built-in amorphous aluminium into a three-dimensional molded product is also highly efficient and yields high. be able to.

In the present invention, since rolling by forced biting is used, shear deformation (rubbing) of powder particles against each other, which cannot occur with conventional hydrostatic pressure powder compacting methods (HIP, CIP, etc.), is avoided. get up. Furthermore, since the container is rolled together with a high-strength metal container, the internal components are subjected to a large rolling force, resulting in large deformation of the particles. As a result, it is possible to obtain a molded article which is extremely excellent in forcible adhesion between the built-in parts. This fact also results in the method of the present invention being able to produce compacts having a density at or close to the theoretical density at a much lower temperature than conventional sintering or hot rolling methods. Amorphous amorphous powder loses its excellent properties when heated, but in the present invention, a compact with high density can be formed at a low temperature, so its excellent physical properties are improved. The chemical properties are maintained even when the product is made into a three-dimensional molded product. In the present invention, the inside of the metal tube may be vacuum-sealed and rolled, but the air inside the metal tube or the inert gas inside the metal tube manufactured under an inert gas atmosphere may be removed by providing gas vent pores. If both ends of the tube are sealed, most of the material will be released outside the tube during densification and compression.

[Example] A SUS304 steel strip with a thickness of 5 mm and a length of 5 m was bent into a tubular shape with an outer diameter of 35 mm and an inner diameter of 25 mm using forming rolls, and the ends of the metal strip were electron beam welded using the method shown in Figure 1. At the time of joining, powder obtained by crushing a strip of amorphous alloy (Fe ₇₉ Si ₈ B ₁₃ ) foil is passed through a supply pipe from the entire surface of the welded part into a stainless steel pipe filled with argon gas at the rear of the welded part. A 5 m long stainless steel pipe containing amorphous amorphous powder was manufactured. After sealing both ends of this stainless steel pipe with pores for gas venting and compacting it by rolling to a thickness of 20 mm, it was immersed in a salt bath maintained at 510°C for 2 minutes, and immediately
It was rolled to a thickness of 11 mm using a step pass. The rolling was carried out using a rolling mill with a roll diameter of about 300 mm at a rolling speed of about 0.1 m/s. After passing through the rolls, the rolled product was immediately cooled with water. After cooling, the stainless steel part was removed and the thickness was approximately 3.5mm.
An amorphous three-dimensional molded product with a width of about 35 mm was taken out. As a result of X-ray diffraction of this three-dimensional molded product, it was found that the amorphous state was maintained.

[Effects of the Invention] According to the present invention, it becomes possible to produce a three-dimensional amorphous molded product on an industrial scale with high efficiency and yield.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the forming process, welding process, and filling process of a metal tube containing amorphous acetate according to the present invention, FIG. It is a figure explaining the effect|action of densification compression of this invention. 1: Metal band, 2: Forming roll, 3: Welding machine, 4: Amorphous amorphous powder tank, 5: Supply pipe,
6: Amorphous amorphous powder, 7: Metal tube, 8: Roll.

Claims (1)

[Claims] 1. A forming process in which a metal strip is continuously bent into a tubular shape, a welding process in which the ends of the bent metal strip are continuously joined, and amorphous alloy powder particles are added to the metal tube formed by welding. a filling step in which the material is continuously filled, a heating step in which the metal tube containing the amorphous amorphous alloy particles is heated to just below the crystallization temperature of the amorphous amorphous alloy, and the amorphous acetate contained in the amorphous acetate by rolling the heating body. A method for forming an amorphous amorphous alloy powder and granules, which comprises a rolling step of turning the alloy powder into an amorphous alloy three-dimensional molded product.