JPS60114540A - Fiber-reinforced composite member and its production - Google Patents

Abstract

PURPOSE:To produce a fiber-reinforced composite member having excellent strength by packing and combining an Al alloy matrix to a precipitation hardening stainless steel fiber molding by a high-pressure solidification casting method then subjecting the fibers and member themselves to a specific heat treatment. CONSTITUTION:Precipitation hardening stainless steel fibers such as SUS 631J1 or the like specified in JIS are heated together with a brazing filler metal to a high temp. to melt the brazing filler metal and to bond diffusibly and partially the fibers to each other thereby forming a molding. The molding is then cooled and subjected to a soln. heat treatment. An Al alloy as the matrix is packed and combined with the above-mentioned fiber molding by a high-pressure solidification casting method. The resulting member is heated to about 450-510 deg.C and is then cooled by which the above-mentioned fiber molding is subjected to a precipitation hardening treatment and at the same time the above-mentioned matrix is subjected to a soln. heat treatment. Such member is again heated to about 170 deg.C and is then air cooled to subject the matrix to an artificial aging treatment by which the strength is improved and the fiber-reinforced composite member is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fiber reinforced composite member and a method for manufacturing the same.

The applicant first forms a fiber molded body by partially diffusion bonding between inorganic fibers such as stainless steel fibers using a copper-based brazing filler metal or by firing, and then uses a light material as a matrix to form a fiber molded body. We have proposed a composite member in which the alloy is filled and composited using high-pressure solidification casting, and the predetermined locations are reinforced with fibers at the same time as the member is cast. According to the above-mentioned high-pressure solidification casting method, it is possible to sufficiently fill and composite the matrix into the fiber molded body, and it can be said that it is an effective means for manufacturing this type of fiber-reinforced composite member.

The inventors of the present invention have thoroughly examined the physical properties of the above-mentioned machine base members.As the fibers are heated to high temperatures during brazing and firing, the fibers themselves are annealed and their strength decreases. It has been found that this tends to affect the strength of composite members.

In view of the above, an object of the present invention is to provide a fiber-reinforced composite member whose strength is improved by using precipitation-hardened stainless steel fibers as reinforcing fibers and subjecting the fibers and the member itself to a specific heat treatment. , a precipitation-hardened stainless steel fiber molded body that has been subjected to precipitation hardening treatment after solution treatment, and aluminum that has been filled and composited by high-pressure solidification casting into the FJ < bottom-off shape body and has been subjected to artificial aging treatment after solution treatment. It is characterized by being composed of an alloy matrix.

An embodiment in which the present invention is applied to a connecting rod for an internal combustion engine will be described below.

<Example> 1st. FIG. 2 shows a connecting rod using an aluminum alloy as a matrix. Reference numeral 1 denotes a frame portion, and an annular small end portion 2 and a semi-annular large end half body 3 are integrally provided at both ends of the frame portion. The frame part 1 is fiber-reinforced by precipitation-hardened stainless steel fiber moldings F arranged in the axial direction.

- The above connecting rod is manufactured by the method described below.

First, precipitation hardening stainless steel fibers (hereinafter referred to as PH
It is called steel fiber. ) is inserted into a heat-resistant glass tube together with a copper-based brazing material, and held at a temperature of 1.1201:' for 15 minutes to melt the brazing material, which partially diffuses and bonds the fibers together to form fibers. Body F is molded, then HKdh
The molded body F is cooled at a cooling rate of 10 C/sec.

The above temperature of 1,120C is the melting point of the copper filter 5 material and the solution temperature of P E @ fibers, so by cooling from this temperature at the above rate, the fiber molded body F is subjected to solution treatment and hardened. do. This fiber molded product F has a bulk density of 2.65 g/cc and has good shape retention.

Next, the fiber molded body F is arranged in the axial direction in the cavity for forming the frame part of the mold, and a connecting rod is cast by a high-pressure solidification casting method using an aluminum alloy (J)S ACBB material) as the matrix M. At the same time, the frame 1
In the step, the fiber molded body F is filled and composited with the matrix M to be reinforced with fibers.

After that, the connecting rod was heated to 500C for 15 hours, then 6
Cool using hot water of 0C or higher. Through this heat treatment, the aluminum alloy serving as the matrix M is subjected to solution treatment, while the pH steel fibers constituting the fiber compact F are subjected to precipitation hardening treatment.

The temperature of the above solution treatment and precipitation hardening treatment is 450 to 510℃.
C is appropriate; below 450C, precipitation hardening of the pH steel fibers is impossible, while above 510C there is a risk of reaction between the aluminum alloy and the pH steel fibers.

After the above treatment, the connecting rod is heated to 170C for 110 hours and then air cooled to perform artificial aging treatment on the aluminum alloy as the matrix M, thereby improving the strength of the aluminum alloy.

Figure 3 shows PH'AA fiber (I) and JIS SUS 27
It shows the elastic proportionality limit of stainless steel fiber (U) expressed by: A is before heat treatment of each fiber, B is after solution treatment, and C is after precipitation hardening treatment. As is clear from Fig. 13, the strength of the PH steel fiber (I) is greatly improved by the above heat treatment compared to the other stainless steel fiber (II), and the strength of the pH steel fiber (I) is improved and the strength of the aluminum alloy solution is improved. Due to the strength improvement through aging and artificial aging treatment, the elastic proportionality limit of the connecting rod rod part 1 is 7.500 when using pH steel fiber, and when using stainless steel fiber (II
) using 5. s o o kg, /yu,:
A dramatic increase was observed compared to .

As described above, according to the present invention, it is possible to provide a fiber-reinforced composite member that is lightweight and has improved strength, and is effective for application to automobile parts such as connecting rods. Furthermore, the combination of the precipitation hardened stainless steel fiber molded body and the aluminum alloy matrix has the manufacturing advantage that precipitation hardening of the fiber molded body and solution treatment of the matrix can be carried out in one step.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of a connecting rod, and FIG. 2 is a vertical sectional view of a connecting rod. -■ line cross-sectional view, FIG. 3 is a graph showing changes in elastic proportionality limit. F...Fiber molded body, M...Matrix (as shown in Figure 2)! ;(No change in i)) Procedural amendment (f
flQ) On February 23, 1980, the Patent Office filed the following document: 1, Indication of small matter, Showa 8, Japanese Patent Application No. 222947, 2, Title of the invention: Fiber & if 1 reinforced composite material and manufacturing method 3, Person making the amendment: Relationship to matter 961゛Applicant name (53Z) Honda Motor Co., Ltd.-14, Agent 〒105 (1st location Higashijet Miyako-ku 'F11 Yoshikou' 4th and 5th R. Tsuno, Nobi) 5. Paper circulation by subject of amendment

Claims (2)

[Claims] (1) Precipitation-hardened stainless steel fiber molded body subjected to precipitation hardening treatment after solution treatment, and N6 tx & 61 molded body filled and composited by high-pressure solidification casting method, and subjected to artificial aging treatment after solution treatment. A fiber-reinforced composite material consisting of aluminum alloy and gold matrix. (2) A process of forming a fiber molded body at high temperature using precipitation hardened stainless pot fibers, a process of completing a solution treatment for the fiber molded body by cooling the fiber molded body, and a step of forming a matrix on the fiber molded body. A process of filling and compounding the aluminum alloy using a high-pressure solidification casting method and simultaneously casting the parts. a step of heating and cooling the member to subject the fiber molded body to a precipitation hardening treatment and at the same time subjecting the matrix to a solution treatment; heating and cooling the member again;
A method for producing a fiber-reinforced composite member comprising a Lux artificial aging treatment process.