JPH036338A - Manufacture of composite material - Google Patents

Abstract

PURPOSE:To reduce the quantity of reinforcing fiber or the like and to increase the strength in a desired place by forming a recessed part or a blank space on a formed body of an inorganic material and infiltrating the grains dispersed in matrix metal into the recessed part or the blank space. CONSTITUTION:A recessed part 10a or a blank space is formed on the surface of a formed body 1 formed by short fiber, long fiber or the like of an inorganic material. The formed body 1 is heated and is set into a die 2. The dispersion molten metal 9 of nonmetallic or high m.p. metallic grains (such as SiC grains 8) in which Al alloy or the like is regulated as matrix metal is poured into the die 2. Pressure is applied by a pressuring punch 4 to infiltrate the molten metal 9 into the formed body 1. In the stage of pressurizing, the matrix metal is infiltrated into the fiber in the formed body 1 and the grains 8 are infiltrated into the recessed part 10a or the blank space, by which a composite place can be formed.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method for manufacturing a fiber reinforced composite material.

(Prior Art) Recently, special mechanical properties are required in parts of various components and members of automobiles, aircraft, etc., so the specific strength, abrasion resistance, heat resistance, etc. of such members, etc. As a means to improve the performance, an attempt has been made to construct such a member kf+ from a fiber-reinforced composite material with a light alloy such as an aluminum alloy as a matrix using various inorganic fibers.

That is, FIG. 4 is a cross-sectional view showing the manufacturing method of the above-mentioned composite abrasive material.
After preheating at 00°C, the molten metal 3 is placed in the mold 2 and becomes a matrix of aluminum alloy, etc.
and pressurize the molten metal 3 with a pressure punch 4 etc.
The pressurized state is maintained until the molten 7-trix metal is completely solidified, and the aluminum alloy is infiltrated into the molded body.

It has also been done to obtain a composite material by adding particles of a non-metal or high melting point metal to a molten matrix metal, stirring the mixture in a molten or semi-molten state, and then applying pressure.

(Problems to be Solved by the Invention) However, in products that use molded bodies as described above, the cost increases because short fibers and long fibers for reinforcing are usually expensive, and reinforcing is not required in non-composite areas. There are also problems such as not being able to increase the hardness. In addition, in those using particles of non-metallic materials, there are problems such as the inability to collect particles at a high density in a specific location, making it impossible to strengthen a specific location.

In view of these points, an object of the present invention is to provide a method for manufacturing a composite material that can reduce the amount of expensive short fibers, whiskers, etc., and increase the strength etc. of desired parts. do.

[Structure of the invention]

(Means for Solving the Problems) The present invention involves forming recesses or voids in a molded body made of short fibers, long fibers, etc. made of an inorganic material, and dispersing particles in a matrix metal in the recesses or voids. It is characterized by infiltrating particles of a non-metal or a high-melting point metal.

(Function) When a molten matrix metal is infiltrated into a molded body under pressure, the matrix metal penetrates into the molded body made of fibers, but the particles dispersed within the matrix metal have difficulty in penetrating, and the molding It tends to remain in front of the body.

However, since recesses or voids are formed in the molded product, particles enter the recesses or voids, and the surface portion of the molded product is reinforced by both the fibers and the particles.

Moreover, the dispersion of the particles becomes gradually denser as it approaches the boundary with the molded body, resulting in a graded material whose hardness and Young's modulus gradually decrease from the molded body part, resulting in large thermal stress at the boundary during heat treatment, etc. will no longer occur.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a schematic diagram of the present invention, showing a state during pressurization.

That is, the diameter is 0.1 to 1.0 μm and the length is 10 to 10 μm.
A molded body 1 is formed with whiskers made of an inorganic material such as 0 μm SiC or S 1 3 N 4 using water glass or the like as a binder.
After heating to 0° C. and setting in the mold 2, SiC particles 8 made of Aρ alloy as a mixed metal and molten metal 9 of the dispersion alloy are poured into the mold 2 and poured into the molten metal in the same manner as before. Pressurization/
500 to 1.0 with a wrench. A pressure of 000 kgf/c paddle is applied to impregnate the molten metal into the molded body.

By the way, on the surface of the molded body 1, there are marks shown in FIG. 2(a),
As shown in (b), a groove-shaped recess 10a or a circular recess 10b is formed, and the mold is placed so that the groove-shaped recess 10a or circular recess 10b faces the molten metal injection side (upward in the figure). Sesoto within 2. Moreover, the molded body 1 is a second
As shown in Figure (C), the fiber bundles 11 are arranged so that their axes are aligned with each other.
The fiber bundles 11 are formed in one row so that there are spaces between each fiber bundle 11, and set in the mold 2 so that the axis of the fiber bundles 11 faces upward and downward.

During the pressurization by the pressure punch 4, the matrix metal impregnates into the fibers of the molded body 1, and
The SiC particles 8 enter into the recesses 10a and 10b of the molded body 1 or into the spaces between the fiber bundles 11, and this portion becomes a composite area of both fibers and particles, and is reinforced by both the fibers and particles.

FIG. 3 is a schematic enlarged view of the boundary between the molded body portion and the particle-dispersed alloy portion in FIG. 1, and reference numeral 8 in the figure represents SiC.

By the way, the SiC particles 8 dispersed in the molten metal of the A and Q alloys are not penetrated by the whisker compacts during the above-mentioned pressurizing process, so the particles are dispersed on the side of the particle-dispersed alloy near the boundary of the compacts. Depending on the thickness of the molded body, the particles become gradually more densely dispersed toward the molded body, and the particles above that point become normally dispersed. Therefore, it becomes a graded material whose hardness and Young's modulus gradually decrease from the molded body portion.

In the above embodiments, SiC particles were used as the particles, but the particles may be of other non-metals or high melting point metals.

〔Effect of the invention〕

As explained above, in the present invention, inorganic particles are allowed to enter the recesses or voids formed in the molded body, so the amount of long and short fibers forming the molded body is reduced accordingly, reducing costs. can do. In addition, it is also possible to mix particles with different properties from fibers, such as by mixing hBN particles with good lubricity into a hard SiC whisker molded body, or by mixing hard SiC particles into a soft carbon fiber bundle.
It is also possible to assume that the characteristics have changed.

10b...Circular recess,

Claims (1)

[Claims] A recess or cavity is formed in a molded body made of short fibers, long fibers, etc. made of an inorganic material, and particles of a nonmetal or high-melting point metal dispersed in a matrix metal are infiltrated into the recess or cavity. A method for manufacturing a composite material, characterized by: