JPS626759A - Production of reinforced composite metal - Google Patents

Abstract

PURPOSE:To produce a reinforced composite metal having an intricate shape and to make mass production with a simple installation by spraying a metal in the form of pulverous particles of a half-molten state into a casting mold and solidifying the same in the presence of a reinforcing material. CONSTITUTION:A melten metal flow control bar 2 is adequately pulled up to eject the molten metal 3 to an outlet 1a for outflow and gaseous argon is passed to a nozzle 4 for spraying so that the metallic particles are ejected therefrom in the form of the pulverous particles. The molten metal 3 sprayed in the above-mentioned manner fall and the solidification on cooling progresses to form the pulverous metallic particles 7 in the half-molten state. The particles 7 fall onto a casting mold 8 on the inside surface of which a release agent is preliminarily coated. The falling particles associate with each other and solidify quickly. The reinforcing material is supplied at the same instant from nozzles 5 for spraying the reinforcing material to the mold 8. The reinforced composite metal uniformly dispersed therein with the reinforcing material is thus produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to fibrous reinforcing materials such as boron fibers, silicon carbide fibers, and alumina fibers, and metals (including alloys).

The present invention relates to a method for manufacturing a fiber-reinforced composite metal by combining a metal with a particulate reinforcing material such as alumina particles, and a method for manufacturing a dispersion-reinforced composite metal by combining a particulate reinforcing material such as alumina particles with a metal.

[Prior Art] Reinforced composite metals (referring to fiber-reinforced composite metals and dispersion-reinforced composite metals), which are made of metal as a base material and composited with fibrous or particulate reinforcement, have properties that cannot be achieved with a single material. Because it has properties such as specific strength, thermal expansion, elasticity, and abrasion resistance, it is attracting attention and being put into practical use as an aircraft material, for example.

These reinforced composite metals are generally more difficult to plastically work than the base metal, so it is desirable to manufacture them in a shape as close to the final product as possible. Therefore, in recent years, there has been a demand for a manufacturing method that can manufacture these reinforced composite metals even in complex shapes.

Among reinforced composite metals, fiber-reinforced composite metals (hereinafter abbreviated as FRM), which are composites of fibrous reinforcing materials, have high deformation resistance and are therefore difficult to plastically work. Conventional FRM manufacturing methods can be broadly classified into liquid phase methods, solid phase methods, and gas phase methods. Liquid-phase methods include high-pressure solidification casting, in which molten metal mixed with reinforcing material is poured into a mold and solidified under high pressure, and fibrous reinforcing material in the form of a sheet is immersed in molten metal, allowing metal to adhere to it. After that, there is a molten metal immersion method that involves molding.

According to these liquid phase methods, it is possible to manufacture even products with complicated shapes. However, in these liquid phase methods, the fibrous reinforcement is in contact with high-temperature molten metal for a long time, so a compound layer is formed at the interface between the fibrous reinforcement and the matrix metal, resulting in a strength lower than that expected theoretically. The disadvantage is that it is also lower. Furthermore, when short fibers are used as the fibrous reinforcing material, there is a difference in specific gravity between the fibrous reinforcing material and the metal, so there is a drawback that the fibrous reinforcing material is not dispersed uniformly and is concentrated. have.

As a solid phase method, there is a method in which a prepreg sheet of fibrous reinforcing material is coated with metal and then diffusion pressure bonded by hot pressing, but it cannot be manufactured into complicated shapes and the manufacturing process is complicated and time-consuming. The disadvantage is that it takes a lot of time.

As the gas phase method, there is a method based on ion blating method. According to the ion blating method, although it is possible to manufacture into complicated shapes, it requires a high vacuum of about 10-s7 orr, so the productivity is low and it is not suitable for industrial mass production.

[Problem to be Solved by the Invention 1] As described above, even with conventional FRM manufacturing methods, such as the in-phase method and the vapor phase method, it is possible to manufacture an FRM with a complicated shape. However, as mentioned above, the solid phase method has the disadvantage that the strength cannot be increased due to the formation of a compound layer at the interface between the reinforcing material and the matrix metal, and the reinforcing material is not uniformly dispersed. However, it had the disadvantage of low productivity and was not suitable for the industrial world.

Furthermore, for dispersion-strengthened composite metals in combination with particulate reinforcing materials, there has been a need for a method for manufacturing dispersion-strengthened composite metals that have complex shapes and in which particulate reinforcing materials are uniformly distributed.

Therefore, an object of the present invention is to provide a method for manufacturing a reinforced composite metal having a complex shape and without the above-mentioned drawbacks.

[Means for Solving the Problems] According to the present invention, in a method for manufacturing a reinforced composite metal in which a reinforced composite metal is formed by combining a reinforcing material and a metal in a mold, the metal is placed in a semi-molten state in the mold. The reinforcing composite metal is formed by spraying it into fine particles and solidifying it in the presence of the reinforcing material.

[Operation] In this invention, the metal is sprayed in the form of fine particles into the mold in a semi-molten state. Therefore, the metal solidifies while maintaining the shape corresponding to the mold. Furthermore, since the metal sprayed in fine particles quickly solidifies in the mold, the coexisting reinforcing material is not exposed to high temperatures in the molten metal for a long time.

[Example] The drawings are schematic configuration diagrams showing one embodiment of the present invention.

The metal groove 13 is held within the crucible 1, and the bottom of the crucible 1 is provided with an outlet 1a for outflow of the metal groove'/a3, which projects downward.

A molten metal flow rate adjusting rod 2 having a conical tip 2a is provided above the opening 1b of the outflow outlet 1a on the crucible 1 side, and the tip 2a is fitted into the frontage 1b. It's located like that. Below the outflow outlet 1a is a spray nozzle 4 for spraying the molten metal 3 in the form of fine particles.
are provided on both sides. Although not shown, an inlet pipe from an argon gas storage tank is provided between the spray nozzle 4 and the outflow outlet 1a so as to generate a flow 1o of argon gas. Further, a mold 8 is installed below the spray nozzle 4. Above the mold 8, reinforcing material dispersion nozzles 5 for dispersing and supplying the reinforcing material into the mold 8 are provided on both sides of the crucible 1.

In order to carry out the present invention using the apparatus configured as described above, first, the molten metal flow m, the adjusting rod 2 are pulled up, and the outflow outlet 1a is pulled up.
A gap is formed between the opening 1b and the tip 2a of the molten metal flow rate adjusting rod 2. From this gap, the molten metal 3 flows downward through the outflow outlet 1a due to its own weight. Therefore, the flow m of the molten metal 3 can be adjusted by adjusting the interval of this gap depending on the extent to which the molten metal flow rate adjusting rod 2 is pulled up. The outflowing molten metal 3 tries to rapidly pass between the pair of spray nozzles 4 due to the action of the argon gas flow 10 flowing between the outflow outlet 1a and the spray nozzle 4, so it becomes fine particles. It becomes sprayed. The molten metal 3 sprayed in this manner is cooled and solidified as it falls, becoming semi-molten metal particles 7. The metal fine particles 7 are intended to fall onto a mold 8 whose inner surface has been coated with a mold release agent in advance, and rapidly solidify while associating with each other to form a lump.

On the other hand, along with the spraying of such fine metal particles 7, the reinforcing material is distributed and supplied onto the mold 8 from the reinforcing material dispersing nozzle 5. The reinforcing material supplied onto the mold 0 is in a state where it is uniformly dispersed and mixed with the metal fine particles 7. Since the metal fine particles 7 rapidly aggregate and solidify, the reinforcing material is placed in the metal in this uniformly dispersed state.

Therefore, by the method of this embodiment, a reinforced composite metal 9 in which the reinforcing material is uniformly dispersed can be manufactured. In addition, since the metal fine particles 7 rapidly aggregate and solidify, the reinforcing material is not exposed to high temperatures in the molten metal for a long time, resulting in a decrease in strength due to the formation of a compound layer at the interface between the reinforcing material and the metal matrix. Not at all. Furthermore, unlike the conventional gas phase method, a high vacuum is not required, so reinforced composite metals having rough shapes can be industrially mass-produced.

Using the equipment shown in the drawing, a mold release agent was applied to the mold, silicon carbide fibers cut into pieces with an average diameter of 2 μm and a length of 1 inch were used as the reinforcing material, aluminum was used as the molten metal, and FRM was made by spraying with argon gas at 5 atm. Manufactured. Obtained FRM
The fiber volume fraction of was about 30%, and the reinforcement was uniformly distributed in the metal matrix. A tensile test sample was cut from the obtained FRM, and a tensile test was conducted at room temperature and 400°C. As a result, it was 52 cm/mm at room temperature and 48 cm at 400'C.
It exhibited a high tensile strength of kg/mm2. Therefore, it was confirmed that the FRM obtained by the manufacturing method of the present invention has high strength.

In addition to the silicon carbide fibrous reinforcing material used in this example, fibrous reinforcing materials such as boron and alumina can be used as the reinforcing material in the manufacturing method of the present invention. As the fibrous reinforcing material, either long fibers or YB woven fibers can be used, and as short fibers, whiskers or cut long fibers are used. Particulate reinforcing materials such as alumina particles can also be used as reinforcing materials.

These particulate reinforcing materials can also be used in combination with fibrous reinforcing materials.

When using a long fiber material, especially a long fiber prebrig sheet, as the mN-shaped reinforcing material, it is impossible to feed it from above the mold as in this example, so the prebrig sheet is placed in the mold in advance. After the brig sheet is installed, metal is sprayed into the mold for manufacturing. In the reinforced composite metal of Prebrig Sea 1 obtained in this way, uniform dispersion of the reinforcing material is not required, and the effect of this invention is mainly due to the formation of a compound layer at the interface between the reinforcing material and the metal matrix. It is used to prevent strength reduction due to non-uniformity. Generally speaking, in such a case, it is also possible to supply another reinforcing material into the mold together with the spraying of the metal fine particles.

The metal used in the manufacturing method of the present invention is not particularly limited, but aluminum, magnesium, nickel, alloys thereof, and the like are preferred from the viewpoint of the properties of the obtained reinforced composite metal.

[Effects of the Invention] In this invention, since the metal is sprayed into the mold in the form of fine particles in a semi-molten state, the metal solidifies while retaining the shape corresponding to the mold. Therefore, reinforced composite metals having complex shapes can be manufactured.

Additionally, since the metal sprayed in fine particles solidifies rapidly within the mold, the reinforcing material is not exposed to high temperatures in the molten metal for long periods of time. Therefore, there is no decrease in strength due to the formation of a compound layer at the interface between the reinforcing material and the metal matrix. Furthermore, since it does not require manufacturing conditions such as high vacuum, it is a manufacturing method that can be industrially mass-produced.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram showing an embodiment of the present invention. In the figure, 3 is a molten metal, 4 is a spray nozzle, 6 is a reinforcing material, 7 is a semi-molten metal fine particle, 8 is a mold, and 9 is a reinforced composite metal.

Claims (7)

[Claims] (1) In a method for manufacturing a reinforced composite metal, in which a reinforced composite metal is formed by combining a reinforcing material and a metal in a mold, the metal is sprayed in the form of fine particles into the mold in a semi-molten state, and the reinforcing material is A method for producing a reinforced composite metal, characterized in that the reinforced composite metal is formed by solidifying in the presence of. (2) The method for manufacturing a reinforced composite metal according to claim 1, characterized in that a fibrous reinforcing material is used as the reinforcing material. (3) The method for manufacturing a reinforced composite metal according to claim 1, characterized in that a particulate reinforcing material is used as the reinforcing material. (4) The method for manufacturing a reinforced composite metal according to claim 2, characterized in that short fibers are used as the fibrous reinforcing material. (5) The method for manufacturing a reinforced composite metal according to claim 2, characterized in that long fibers are used as the fibrous reinforcing material. (6) According to any one of claims 1 to 5, wherein the reinforcing material is distributed and supplied into the mold together with the spraying of the metal in a semi-molten state. A method for manufacturing the reinforced composite metal described. (7) Claim 1, 2 or 5, characterized in that the reinforcing material is placed in the mold in advance, and then the metal is sprayed in a semi-molten state into the mold. A method for producing reinforced composite metals.