JPS624843A - Production of fiber-reinforced composite metallic material - Google Patents

Abstract

PURPOSE:To produce a composite material thoroughly penetrated with a matrix metal into reinforcing fiber materials in the stage of producing a fiber-reinforced composite metallic material by putting the preheated reinforcing fiber materials into a casting mold having an air permeable partition member in the bottom part, pouring a molten metal for the matrix from above the same, vacuum-evacuating the gas from the lower part and pressurizing the materials. CONSTITUTION:The reinforcing fiber materials 8 such as carbon fibers, alumina fibers or SiC fibers having high strength and high elasticity are preheated and are put into the casting mold 1. The partition member 4 formed of porous ceramics or 150-300 mesh metallic screen is placed in the bottom of the casting mold 1 and is supported from below by a reinforcing plate 5. The melt 9 of the light metal such as Al, Mg or the alloy thereof is poured onto the reinforcing fibers 8 in the casting mold and while the gas in the fibers 8 is sucked and removed from a vacuum discharge port 7, the molten metal 9 is pressurized and solidified by a plunger 10. The light metal which is the matrix metal is thoroughly penetrated into the reinforcing fiber materials 8 and the fiber-reinforced composite metallic material having the excellent reinforcing characteristic by the fiber materials is produced with a good yield.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a fiber-reinforced metal composite material, and more particularly, to a method for reducing as much as possible the portion of the fiber-reinforced material that is not penetrated by matrix metal.

(Conventional technology) In recent years, high-strength materials made of carbon, alumina, silicon carbide, etc.
Fiber-reinforced metal composite material (hereinafter referred to as FRM) is a fiber-reinforced metal composite material (hereinafter referred to as FRM) in which highly elastic fibers are used as a reinforcing material and a light metal such as aluminum or magnesium or an alloy thereof is used as a matrix.

), and the development of metal composite materials using ceramic particles as reinforcement is also becoming more active.

A pressure casting method is a typical method for manufacturing these FRMs. In this method, a fiber reinforced material is charged into a cylindrical mold with a bottom, and after preheating, a molten matrix metal is injected, and then a plunger fitted in the mold is used to pressurize and infiltrate the matrix metal into the fiber reinforced material. After that, it is solidified to obtain the desired FRM.

(Problems to be Solved by the Invention) A problem with this pressure casting method is degassing during pressurization. That is, the air and gas components in the mold interior space are degassed by natural degassing from a minute gap between the mold inner surface and the plunger as the plunger is pushed. If air remains in the charged fiber reinforced material, or if adsorbed gas components of the fiber reinforced material are gasified during high temperature heating when preheating the fiber reinforced material, if these are insufficiently degassed. , the molten matrix metal is not forced into or penetrated into that part. Therefore, the mechanical strength of the FRM after casting becomes defective due to the unpenetrated portion, and the desired mechanical strength cannot be obtained, resulting in a decrease in manufacturing yield and an increase in cost.

The present invention was made in view of the above problem, and is an FR material in which molten matrix metal is pressurized and permeated into a fiber reinforced material.
When manufacturing FRM, no air or gas components remain in the mold space filled with fiber reinforcement, thus producing high quality FRM.
The purpose of the present invention is to provide a manufacturing method that can obtain the following. - (Means for solving the problem) The means characterized by the present invention for achieving the above object are as follows:
In the pressure casting method, a breathable partition member is provided at the bottom of the mold, and the upper part of the fiber reinforced material charged into the mold is sealed with the molten metal, thereby preventing air and gas from the mold interior space occupied by the fiber reinforced material. After or while vacuum degassing the components from the partition member, the molten metal is pressurized and permeated into the fiber reinforcing material.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a mold 1 in the process of manufacturing an FRM to which the present invention is applied. In the same figure, a heater 3 for preheating is provided on the outer periphery of the mold body 2, and a breathable partition member 4 is attached to the lower part of the mold body 2. forming the bottom. The partition member 4 is formed of porous ceramics or a metal screen of 150 to 300 meshes, and is backed up by a reinforcing plate 5 provided directly below it. The reinforcing plate 5 is provided with a large number of degassing holes, which communicate with a vacuum exhaust lower provided in the bottom plate 6.

8 is a fiber reinforcing material charged into the mold 1, 9 is a matrix metal molten metal, and 10 is a plunger for pressurizing the molten metal.

Next, a method for manufacturing an FRM according to the present invention will be explained based on FIG.

The fiber reinforced material 8 whose bulk density has been increased by preforming is charged into the heated mold 1 and heated to 300° C. or more to the melting point of the matrix metal. Preheating to such a temperature range allows the gas components adsorbed on the fiber surface of the fiber reinforcing material 8 to be released, and at the same time improves the wettability of the fiber reinforcing material 8 to the matrix metal molten metal, making it easier for the matrix metal molten metal to penetrate. This is to ensure that. In addition, if the fiber reinforcing material deteriorates due to oxidation due to preheating, it is important to perform the preheating under an inert gas atmosphere.

Next, a matrix metal molten metal is poured into the mold 1. If the molten metal is simply injected into the mold 1, it will not penetrate into the fiber reinforcing material 8 due to its surface tension and will remain thereon.

That is, the fiber reinforced material 8 charged into the mold 1
is surrounded by the bottom surface, peripheral side surface, and matrix metal molten metal 9, and the upper part of the fiber reinforced material 8 is sealed from the atmosphere by the molten metal 9.

When vacuum degassing is performed in such a state, the air and gas components in the internal space of the mold 1 occupied by the fiber reinforced material 8, that is, the air inside the fiber reinforced material 8 and the gas components generated during preheating, are removed from the mold 1.
It passes through the bottom partition member 4, the reinforcing plate 5, and the vacuum evacuation lower part of the bottom plate 6, and is discharged to the outside. After that, plunger 10
By pressurizing the molten metal 9, it is possible to obtain a high-quality composite material in which the fiber reinforcement material and the matrix metal are in good contact with each other. Note that the pressure is not limited to after the air and the like in the mold 1 have been degassed, but the plunger may be applied while the mold 1 is being evacuated and the air and gas components in the mold 1 are being degassed.

The molten matrix metal is pressurized and permeated to the end of the fiber reinforced material, and after solidification and cooling, the bottom plate 6 and reinforcing plate 5 are removed, and the composite material is taken out from the mold by extrusion from the upper part.

Figures 2 and 3 show a mold 1 in another embodiment of the present invention.
FIG. In FIGS. 2 and 3, there are two plungers, an inner plunger 10a and an outer plunger 10b.
It has a heavy structure. By adopting such a structure, preforming of the fiber reinforcing material is not necessary, and the F
RM is easily obtained.

That is, a fiber reinforced material that has not been preformed is charged into the mold 1, and the inner plunger 10a and the outer plunger lob are both pushed down through the holding metal screen 11 as shown in FIG. Compress the fiber reinforcement to the desired bulk density.

When injecting the matrix metal molten metal, only the inner plunger 10a is pulled out and the molten metal is injected into the outer plunger 10b. At this time, the fiber reinforced material 8 is maintained in a compressed state by the outer plunger 10b and the screen 11, and has a desired bulk density. Here, as in the previous embodiment, after vacuum degassing the air and gas components in the mold 1, or while degassing the inner plunger 1.
0a, the molten metal 9 is infiltrated into the fiber reinforced material 8 under pressure, so that a high quality FRM with the desired fiber reinforced material filling rate is obtained.
easily obtained. In addition, there is no need for preforming of the fiber reinforced material, which simplifies equipment costs and manufacturing processes, which is advantageous in terms of manufacturing costs.

Although the above invention has been described in detail with respect to the method for manufacturing FRM, the present invention can be applied to metal composite materials in general using ceramic particles or the like as a reinforcing material.

In addition, when using the mold 1 and plunger 10 shown in FIG.
It is possible to charge the mold 1 with unpreformed fiber reinforcement and preform it to some extent with the plunger 10. At this time, an inorganic binder may also be added.

(Effects of the Invention) As explained above, according to the present invention, a fiber reinforcing material is charged into a mold, then a matrix metal molten metal is poured,
Before pressurizing and infiltrating the reinforcing material, or while pressurizing and infiltrating, the air inside the mold and the gas components generated during preheating are vacuum degassed. In addition, the matrix metal and the fiber reinforcement are better adhered to each other.
It is possible to improve mechanical properties, improve product yield, and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a mold in the process of implementing the method of the present invention, FIGS. 2 and 3 are sectional views of the mold in other steps of implementing the method of the present invention, and FIG. 2 is a preliminary drawing of the fiber reinforced material. The molding state is shown in FIG. 3, and FIG. 3 shows the state in which the molten matrix metal is poured. DESCRIPTION OF SYMBOLS 1... Mold, 4... Partition member, 7... Vacuum exhaust port, 8... Fiber reinforcement material, 9... Matrix metal molten metal, 10... Plunger, 10a... Inner plunger, 10b...Outer plunger. Patent applicant Kobe Steel Corporation Manager Patent attorney Yasu 1) Toshio Figure 3

Claims (1)

[Scope of Claim] A method for manufacturing a metal composite material in which a fiber reinforced material is charged into a mold and preheated, and then a matrix metal molten metal is injected, and the molten metal is pressurized to penetrate into the fiber reinforced material, comprising: A breathable partition member is provided in the mold, the upper part of the fiber reinforced material charged into the mold is sealed with the molten metal, and the air and gas components in the mold interior space occupied by the fiber reinforced material are vacuum degassed through the partition member. A method for producing a fiber-reinforced metal composite material, characterized in that the molten metal is pressurized and permeated into the fiber-reinforced material after or while being vacuum-degassed.