JPS61149447A - Manufacture of fiber reinforced metallic composite body - Google Patents

Abstract

PURPOSE:To obtain a homogeneous fiber reinforced metallic composite body by stirring inorg. fibers and inorg. particles having a smaller average particle size than the diameter of the fibers to separate the fibers and by mixing the fibers with metallic particles. CONSTITUTION:When metallic particles are mixed with inorg. fibers to manufacture a fiber reinforced metallic composite body (FRM), the inorg. fibers are separated beforehand by stirring the fibers and inorg. particles having a smaller average particle size than the diameter of the fibers. Since the inorg. fibers are well separated, they are uniformly mixed with metallic particles in a relatively short period in the following stage without scratching the fibers.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fiber reinforced metal covering (hereinafter abbreviated as FRM).
The present invention relates to a manufacturing method, and particularly to a manufacturing method capable of obtaining a homogeneous fLFRM.

[Technical background of the invention and its problems]

In recent years, FRMs have been developed in which inorganic fibers such as alumina, carbon, silica siliene carbide, and boron fibers are integrated with metal, and are beginning to be used in many industrial fields.

Among them, FRM manufactured using powder metallurgy has many advantages compared to other methods such as infiltration and diffusion bonding.
That is, (2) compared to the infiltration method, there is less damage to the reinforcing fibers during production.

(3) Compared to the diffusion bonding method, the manufacturing process is simple, the cost is low, and mass production is possible.

etc.

However, FRM using powder metallurgy also has the problem that it is difficult to obtain a homogeneous FRM. This is because the fibers used as raw materials are long cylindrical, the metal powder is lumpy, and each has a different density.

This was caused by the fact that the fibers were not opened sufficiently when the raw materials were mixed using a V-type mixer or a mixing mill, and were not uniformly dispersed among the metal powders. Moreover, requiring long mixing times to achieve uniformity also has the disadvantage of damaging the fibers and reducing their value as reinforcing fibers.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and the present invention has been made in consideration of the above points.
It is an object of the present invention to provide a manufacturing method capable of obtaining RM.

[Summary of the invention]

The present invention is a fiber-reinforced metal characterized in that inorganic fibers and inorganic particles having an average particle size smaller than the fiber diameter are added, stirred, and opened, and then metal particles are mixed and sintered to integrate the inorganic fibers. This is a method for manufacturing a subject.

That is, before mixing the metal particles, which are the main components constituting the FRM, and the inorganic fibers, an opening treatment is performed in which inorganic particles having an average particle diameter smaller than the fiber diameter of the inorganic fibers are added and stirred. , the inorganic fibers are sufficiently opened, and the metal particles and inorganic fibers are uniformly mixed in the subsequent process. Furthermore, since the inorganic fibers are sufficiently opened, mixing with the metal particles takes only a relatively short time and there is no risk of damage to the fibers.

In the fiber opening process of the present invention, it is thought that inorganic particles having an average particle size smaller than the fiber diameter are inserted between the fibers to facilitate fiber opening.

If the average particle size is large, there is no difference from mixing with metal particles, and the effect of facilitating fiber opening cannot be obtained.

Inorganic fine particles can be broadly classified into metal fine particles having conductivity and insulating fine particles.

Fine metal particles are electrically conductive and, when mixed with inorganic fibers, discharge static electricity on the surface of the fibers that causes tangles. Therefore, the entanglement between the fibers is weak), making it easier to open the fibers. If it is then mixed with metal particles, a nearly uniformly dispersed mixture will be obtained, and if it is roughly sintered and integrated, a homogeneous FRM with few pores and the like and a high filling rate will be obtained.

Here, it is used in the invention. As metal fine particles, S
i* Fe mFiin *Nig @ Z r *A
There are first grade metal particles and alloy particles. The average particle diameter is preferably 1/3 or less of the fiber diameter. Also, the amount added is 1
0.1 inch (volume ratio) or more of reinforcing fibers is required.

The upper limit of addition amount varies depending on the alloy system. That is, there is no particular restriction when it forms a solid solution with the matrix metal, but when it reacts with the matrix metal to form a brittle intermetallic compound, it is desirable that it be within the solid solubility limit.

In addition, when insulating fine particles are used, that is, as the particle size becomes smaller, the surface area of the particles increases, and the electrostatic energy stored on the surface is 103 to 104 of the gravity.
It reaches twice as much. Therefore, when mixed with inorganic fibers to be used as reinforcing fibers, small inorganic particles adhere to the surface of the fibers.

At this time, the attraction force due to electrostatic energy that was acting between the fibers is neutralized by the particles, so the entanglement between the fibers becomes weaker, making it easier to open the fibers. After this, when mixed with metal particles, an almost uniformly dispersed mixture is obtained.
If they are roughly sintered and integrated, a homogeneous fiber-reinforced metal composite will be obtained.

Here, the insulator fine particles used in the present invention include Mg
O, AJ203.5i02, SiC, Fe20s 1
z02,'rio2,si 3N4BN,C,A7
There are ceramic particles such as N. Particle size is 1/10 of fiber diameter
The following K is preferable. As for the amount added, it is necessary to add at least 0.1 m of reinforcing fiber (body! It's better not to wake up.

Furthermore, the inorganic fibers used in the present invention include SiC, S
i2N4. There are ceramic fibers such as B4C, BeO, B, C, and Al2O3 and their whiskers, and metals that are composited with these include Be, Mg *Zn, AA!
, Ti, Cu, Ni, Fe, Go, Cu.

There are metals such as Ag and their alloys.

In addition, when mixing inorganic fibers and metal particles as in the present invention, in order to reduce damage to the fibers and obtain sufficient uniformity, it is preferable to mix the mixture in a container whose inner wall is made of a material having at least rubber elasticity. It is preferable to do this.

The rubber-like substance used here is effective if it has rubber elasticity, such as synthetic rubber such as silicone rubber or SBH, or natural rubber whose hardness has been adjusted.

Further, such mixing may be carried out by placing the raw materials in a bag-like container having rubber elasticity, and stirring the raw materials by applying vibrational pressure three-dimensionally from the outside and applying emotional motion.

〔Effect of the invention〕

As explained above, according to the present invention, inorganic fibers and metal particles are mixed sufficiently uniformly, so that a homogeneous fiber-reinforced metal composite can be obtained.

[Embodiments of the invention]

Examples of the present invention will be described below (Example-1) SIC whiskers with an average diameter of 0.5 μm and an aspect ratio of about 50 and SiO2 powder with an average diameter of 0.0125 μm were prepared. The fibers were opened in a mold mixer for 1 hour, and then aluminum powder with a particle size of 44 μm or less was added and mixed for 2 hours. This was then placed in a mold and heated at 580°C at 300 Ic in a vacuum.
6 g/ad by heating and pressurizing for 15 minutes.
An stc whisker reinforced aluminum composite was obtained. Test pieces were cut out from these and subjected to bending tests and hardness measurements.

Table 1 shows the results.

(Example-2) StC whiskers with an average diameter of 0.5 μm and an aspect ratio of about 50 and A/ fine particles with an average diameter of 0.1 μm were prepared and filled with argon gas (1 inch per whisker, volume ratio). Perform fiber opening treatment for 1 hour with a V-type mixer, then s
# Add aluminum particles of 325 or less and further 2
A time mixing treatment was performed. This was placed in a mold and heated and pressurized at 560° C. and 300 kLi/cld for 15 minutes in a vacuum to obtain a SIC Cuisca reinforced aluminum composite.

On the other hand, as a comparative example, the same raw materials were used except for the addition of M fine particles.
After mixing with a W mixer for 3 hours, a composite was obtained under the same conditions as in the example.

Test pieces were cut out from these and subjected to bending tests and hardness measurements. Table 1 shows the results.

As is clear from Table 1, the composites according to the examples of the present invention have greater bending strength than the comparative examples, and are homogeneous FRMs with a small standard deviation of hardness.

As explained above, in the manufacturing method of the present invention, as described above, as the opening treatment of the inorganic fibers, F fibers which are homogeneous and have a high filling rate with a small amount of inorganic fibers etc. can be obtained.

(Example-3) Average diameter 0.5μ after the same fiber opening treatment as in Actual Example-2
StC whisker with m1 aspect ratio of about 50 and particle size of 44
Aluminum powder of µm or less was prepared and subjected to content processing. Furthermore, agitation processing was simultaneously performed using an electric stirrer equipped with a silicone rubber tube 2.

After mixing, put into a mold and heat at 580℃ and 300℃ in a vacuum.
A SIC whisker-reinforced aluminum composite was obtained by heating at /Cd for 15 minutes, cutting edge, and pressing.

On the other hand, as a comparative example, these raw materials were mixed using a V-type mixer.
After a time mixing treatment, a composite was obtained under the same conditions as in the example.

From these, test pieces were cut out and subjected to bending tests and hardness measurements. Table 2 shows the results.

As is clear from Table 2 below, it can be seen that the composites according to Examples of the present invention have greater bending strength than Comparative Examples, and are homogeneous FRMs with small standard deviations of hardness.

As explained above, it can be said that the manufacturing method of the present invention is suitable for obtaining a homogeneous fiber-reinforced composite.

Agent: Patent Attorney Noriyuki Chika (1 other person)

Claims (3)

[Claims] (1) A fiber-reinforced metal composite characterized by adding inorganic fibers and inorganic fine particles having an average particle size smaller than the fiber diameter, stirring and opening the fibers, and then mixing with metal particles and sintering them into one piece. How the body is manufactured. (2) The method for producing a fiber-reinforced metal composite according to claim 1, wherein the inorganic fine particles are metal fine particles and have an average particle size of 1/3 or less of the fiber diameter. (3) The method for producing a fiber-reinforced metal composite according to claim 1, wherein the inorganic fine particles are insulating fine particles and have an average particle size of 1/10 or less of the fiber diameter.