JPS6199692A - Fiber reinforced metallic composite material - Google Patents

Abstract

PURPOSE:To obtain the light inexpensive titled composite superior in mechanical strength, by applying electroless and electrolytic platings to surface of aromatic polyamide fiber as reinforcing material, if necessary, further forming metallic layer thereon to obtain prepreg and using it to compose the titled body. CONSTITUTION:Relatively inexpensive aromatic polyamide fiber having high tensile strength and toughness is used as reinforcing material, electroless plating, next electrolytic plating are applied to the surface to form matrix metallic layer bonded mechanically and strongly with said fiber and prepreg is obtd. Prepreg can be obtd. by forming metallic layer having plural layers by further forming metallic layer on said metallic layer by some means. Said prepreg is hot pressed to obtain the titled body. Metallic layer of said plural layers is favorable to compose of metal having relatively high m.p. as inner layer, and metal having relatively low m.p. of <=500 deg.C as outer layer. In hot pressing, joining of the outermost layer by heating without deforming inner metallic layer is favorable.

Description

[Detailed description of the invention] [Industrial application field] Lightweight and excellent mechanical strength t'Rm reinforcement using aromatic polyamide fiber as a reinforcing material and a single metal or alloy as a matrix This is related to the four-fold complex (hereinafter referred to as the abdominal complex).

[Conventional technology and problems]

The reinforcing fibers used in fiber-reinforced metals are generally inorganic fibers such as alumina fibers, carbon fibers, and boron fibers, and the matrix metals used to bond the fibers to form composites include aluminum and copper. , nickel, etc. are often used.

This is because the purpose is to improve mechanical strength at relatively high temperatures, and the manufacturing method is hot pressing under vacuum.
There are some types of zoni that are expensive to manufacture.

[Means for solving problems]

The present invention uses relatively inexpensive organic aromatic polyamide orange fibers as a reinforcing material in place of the conventional non-woven fibers.

Aromatic polyamide fiber has a specific gravity of 1.44 and a tensile strength of 30.
0 kg/- and has strong toughness. Furthermore, the tensile strength is relatively unaffected by flaws on the fiber surface, a property not found in other inorganic fibers.

In addition, in terms of heat resistance, 180'O can maintain room temperature properties even for long periods of time, and 200 to 250° for short periods of time.
It has excellent properties such that its characteristics do not change significantly even at temperatures of C.

However, there is no good adhesive for aromatic polyamide fibers to take advantage of their excellent mechanical strength and heat resistance.

The present invention uses a relatively low melting point metal as a matrix for aromatic polyamide fibers to provide a relatively inexpensive composite, although its use is limited to temperatures below about 200°C. This problem was solved by first forming a conductive film on the polyamide fibers used as the 48 edge material by electroless plating, and then forming a sufficient metal layer as a matrix by electroplating.

[Summary of the invention]

The present invention is a method of forming a matrix metal for aromatic polyamide fibers by forming a layer of metal with few defects that has a strong mechanical bond with the fibers by electroless plating and electroplating on the surface of the fibers. It is something to do.

Furthermore, in order to facilitate the fabrication of the fiber composite without impairing the mechanical bond with the gold aA 7F5 fiber formed in contact with the fiber surface, R'1. The metal layer made in contact with the L&fiber by L-screen plating and electroplating is used as the inner layer, and the metal layer is formed on the outside by dissimilar gold vS by air plating, electroless plating, hot-dip plating, thermal spraying, etc.

The outer layer metal has a melting point lower than that of the inner layer metal, and a metal with a melting point of 500°0 or less that has good wettability with the inner layer metal is selected.

The outer layer metal of the prepreg thus produced is joined by a method such as hot pressing to form a composite. In this case, the inner layer gold v1 retains the aromatic polyamide fibers.
It plays the role of providing a sufficient mechanical bond between the fibers of the outer layer metal and the fibers of the outer metal layer.

Although it is possible to make a composite using a matrix of Class I S metals formed by electroless plating and electroplating, the multi-layer gold silk matrix described above is easier to work with, and the properties of the composite are is also better.

In addition to the above-mentioned double structure of inner and outer layers,
Due to the coefficient of thermal expansion, a multi-layer structure with two additional inner metal layers is also meaningful.

〔Example〕

First, the manufacturing of prepreg will be explained step by step.

For example, Kevlar 49 (diameter approximately 21 μm), which is an aromatic polyamide fiber manufactured by Devon, is immersed in a methyl ethyl ketone solution to thoroughly degrease the fiber surface.

The fibers are dispersed and spread and immersed in an electroless nickel plating solution. By penetrating the electroless nickel plating solution between the fibers, a highly adhesive and conductive nickel film is created that completely covers the fiber surface. The plating thickness by electroless plating is at least 0.3 μm or more.

Then, approximately 2
Create a μm thick nickel plating layer. by this,
A nickel inner layer with a melting point of 1726° C., which provides sufficient mechanical bonding, is formed on the surface of the Kevlar 49 fiber.

Next, on the outside, a layer of tin with a melting point of 232°0, which has good wettability with nickel and does not impair the properties of the Kevlar 49 fiber during the composite fabrication process, is applied.

A prepreg is formed as an outer layer by plating to a thickness of 2 to 3 μm.

The proportions of each component in the thus completed prepreg are as follows in terms of volume ratio:

Kevlar 49...42-44% Nickel...22-25 Tin...
・・・・・・・・・・・・32～35chi Figure 1 is a 150x micrograph of the cross section of the prepreg formed by the above method, and clearly observes the state of the gold 6 film layer. Therefore, both the nickel layer and the tin layer are about 8 μm thick, with the center being Kevlar fiber, the outer layer being nickel IH1, the outermost layer being tin layer, and gold? All i5/8 are formed into one concentric circle.

Next, the procedure for poor coalescence will be explained. FIG. 2 is a side sectional view of the mold, in which the prepreg 3 described above is layered in the mold 1 in which the heater 1a is embedded.
While heating from the shaft 21, pressure is applied from the pressure shaft 21 to form the product.

Molding (i pressure 6okq/at (1 temperature 210~220'
The mixture is heated and pressurized for 30 to 60 minutes in a reducing atmosphere with O to form a composite.

FIG. 3 is a micrograph of a cross section of a fiber-reinforced metal composite according to the present invention, which was formed by heating and pressing the prepreg shown in FIG. 1, and the magnification was 400 times. 49? It can be seen that although nickel was formed mainly from fibers, it was joined by tin to form a composite.

〔Effect of the invention〕

According to the present invention, it is possible to manufacture the product by using aromatic polyamide fibers manufactured by Organic Trading Co., Ltd., which are cheaper than conventional fibers, as a reinforcing material and using gold, which has a relatively low melting point, as a matrix. It is possible to provide a fiber-reinforced metal composite with low cost and high integrity.

[Brief explanation of the drawing]

Fig. 1 is a microscopic photograph of the cross section of the prepreg of -:AL5 example of the present invention, Fig. 2 is a cross section of the mold of this actual example, and Fig. 3 is a cross-sectional view of the fabric of the present invention. Reinforced gold plate; This is a microscopic photograph of the cross section of the composite.] Molding mold, la, heater, 2, heating RF shaft, 3
...Prepreg. Qi permission? "1 person Toyo M Kikyo] 4 Co., Ltd. Representative Doi D Procedural amendment (spontaneous) May 1985 1988 Patent Application No. 221827 2, Title of invention Fiber reinforced metal composite 3, Relationship with the case of the person making the amendment Postal code of the patent applicant 104 Column 5 of the detailed explanation of the invention in the specification, Contents of the amendment

Claims (3)

[Claims] (1) In the fiber-reinforced metal composite, the reinforcing material is aromatic polyamide fiber, the surface of the aromatic polyamide fiber is subjected to electroless plating followed by electroplating, and if necessary, a metal layer is further applied thereon by some means. By forming
A fiber-reinforced metal composite characterized by using prepreg formed with multiple metal layers. (2) Use a prepreg having a multi-layer structure in which the inner layer is made of a metal with a relatively high melting point in contact with the surface of the aromatic polyamide fiber, and the outer layer is made of a metal with a relatively low melting point of 500°C or less. A fiber-reinforced metal composite according to claim (1). (3) Fiber reinforcement according to claim (1), characterized in that among the plurality of metal layers, the outermost layer is thermally bonded without deforming the inner metal layer in contact with the surface of the aromatic polyamide fiber. metal composite.