JPS58204603A - Manufacture of waveguide - Google Patents

Abstract

PURPOSE:To obtain easily a waveguide made of plastics reinforced with fiber with high quality, by using a core bar for the forming, made of an alloy having a low melting point applied with a metallic plating. CONSTITUTION:In manufacturing the waveguide made of plastic FRP reinforced with fiber, the core bar for the forming made of the alloy 4 having a low melting point is used. This core bar is applied with the metallic plating such as a copper film 2 and a gold film 3, and a cloth 5 made of carbon fibers is laminated on this plated surface while impregnating an epoxy resin. After it is heated and cured at a temperature below the melting point of the alloy 4, the alloy 4 only is heated and molten to obtain the waveguide made of the FRP having the copper film 2 and the gold film 3 at the inside surface of the waveguide. Thus, the waveguide made of FRP with high quality where the metal and the FRP are adhered strongly is obtained easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a waveguide made of fiber-reinforced gelastec (hereinafter abbreviated as FRP).

Traditionally, waveguides used for aviation and space applications are known to be lightweight, so light metal j! 14 models have been widely used. However, FRP has specific strength.

Recently, FRP waveguides have been actively developed due to their excellent specific stiffness and low coefficient of thermal expansion. In such an FRP waveguide,
Even if we use a material with excellent air conductivity, such as Shishi*Sen, as a reinforcing material for FRP, it is difficult to satisfy the electrical requirements for a waveguide.
! Therefore, it is necessary to form (metallize) a layer of conductive material such as gold, steel, or silver on the inner surface of FRP.

The following four methods can be considered as methods for metalizing an FRP waveguide.

■ Electroless plating method: Electroless plating directly on FRP (
(Usually copper) 1-How to do it.

■ Vapor phase plating method: A method of directly vapor depositing metal on FRP, ion grating, or sputtering. ■ Metal foil adhesion method: Gluing metal foil to FRP with an adhesive or attaching metal foil to a core metal for molding. After pasting, FRP
'fr Lamination method: ■ Metal surface transfer method... Aluminum is used as the core metal.

One possible method is to plate this core metal with copper or gold, layer it with FRP, and then dissolve the aluminum in an alkaline solution.

However, in the upper Me electroless plating and vapor phase plating methods, the peel strength (90° T-shaped peel method) is 0.5 k.
It has the disadvantage that only an extremely weak adhesive strength of less than g/cm can be obtained. In addition, with the gold@foil adhesion method, when attaching metal foil to a waveguide with a complex shape, there is no seam in the metal foil, making it difficult to attach VC, and it is possible to apply it uniformly without creating wrinkles. It is very difficult to paste. Furthermore, when using the metal surface transfer method described above, the FRP may be attacked by the alkaline solution when the aluminum of the core metal is dissolved with an alkaline solution, or the alkaline solution may permeate the FRP surface through pinholes on the plated surface of the core metal. However, there is a drawback that there is a risk of peeling between the plated surface and the FRP surface. For these reasons, it is currently not possible to obtain a four-wave plate made of FRP that can sufficiently withstand the harsh environmental conditions of aviation, space, and the like.

This invention aims to eliminate the drawbacks of the conventional manufacturing method as described above, and when manufacturing an FRP waveguide, a laminated FRP is used as a core metal for forming the waveguide. '
A low melting point alloy with a melting point that will not cause RP to be significantly deformed or decomposed during melting of the core metal, preferably an alloy with a melting point of 200 to 250°C, is used, and the core metal of this low melting point alloy is further heated with electricity. Plated with highly conductive metals such as copper, gold, and silver, and coated with glass fiber and carbon fiber on this metal plating surface.

FRP is made by laminating fibers such as aramid fibers impregnated with thermosetting resin and hardening them by heating and pressurizing them at a temperature below the melting point of the low melting point alloy, and by heating and melting only the low melting point alloy of the core metal. To provide a method for manufacturing an FRP waveguide that is fully satisfactory both electrically and in terms of adhesion strength between the metal and the FRP by leaving the metal plated surface on the inner surface of the waveguide. It is an object.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a waveguide made of carbon fiber reinforced plastic (hereinafter abbreviated as CFRP) obtained by a manufacturing method according to an embodiment of the present invention.
A gold film 3 is also provided as a protective film for preventing corrosion of copper. Figure 2 shows that after processing the low melting point alloy (melting point 120°C) 4 used in this example to match the inner shape of the waveguide,
FIG. 2 is a schematic cross-sectional view of a core metal plated with copper 2 and gold 3. FIG. .

To manufacture a CFRP waveguide, first, as shown in FIG. 3, a cloth 5 made of carbon fiber is laminated on the core metal shown in FIG. 2 while being impregnated with an epoxy resin 6.

Next, as shown in FIG. 4, the entire surface of the wooden piece is covered with a vacuum bag molding film 7, placed on a molding plate 8, the periphery of the film 7 is sealed with a sealing material 9, and the film 7 is placed in a vacuum. It is then placed in an autoclay 7'IO and heated to about 100°C and pressurized to harden it. After hardening, it is taken out of the autoclave and placed in a constant temperature bath 11 as shown in Figure 5, where only the low melting point alloy 4 of the core bar is completely melted in an atmosphere of about 130°C, and the inner surface of the CFRPIO is heated as shown in Figure 1. A waveguide in which the copper film 2 and gold film 3 are left is obtained.

As mentioned above, the FRP 4V tube manufactured by the manufacturing method of the embodiment of the present invention has a metallized layer bonded with the epoxy resin used for FRP molding, so it cannot be used with the electroless plating method of the conventional manufacturing method. Unlike the vapor phase plating method, which attaches Gold Unlike the chemical gold transfer method, deterioration of FRP due to chemicals,
There is no fear of deterioration between the RP and metallized layers, and extremely high quality and reliable FRP waveguide gold films can be manufactured. Further, in the above embodiments, a linear rectangular waveguide was explained, but the present invention can be applied to a branched waveguide, a twisted waveguide, a circular waveguide, and a combination of circular and rectangular waveguides. It is possible to easily manufacture waveguides with such extremely complicated shapes, and it is a very effective manufacturing method for waveguides with shapes such as this in which the metal core cannot be removed from the mold.

As explained above, according to the method for manufacturing a waveguide of the present invention, the metal and FRP can be brought into close contact with each other electrically as well.

It is possible to easily manufacture a high-quality and highly reliable FRP waveguide with a sufficiently satisfactory adhesion strength even if the shape is complex.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a waveguide obtained by a manufacturing method according to an embodiment of the present invention, FIG. 2 is a schematic vertical cross-sectional view of a core metal made of a low melting point alloy plated with copper and gold, Figure 3 is a schematic vertical cross-sectional view showing a state in which FRP is molded onto the core metal, and Figure 4 is FRP? f- A schematic cross-sectional view showing the state in which the FRP waveguide is heated and pressurized and hardened after being laminated and placed in an autoclave eC. Figure 5 shows the state in which the low melting point alloy of the core metal is heated and melted. It is a schematic cross-sectional view. 1... CFRP, 2... Copper film, 3... Gold film, 4...
-・Low melting point alloy of core bar, 5...Carbon fiber cloth, 6...
Epoxy resin. 7... Vacuum back molding film, 8... Molding machine,
9...Sealing material, 10...Autoclave, 11.
・・Thermostat O
Shin Kuzuno - Fig. 1 Fig. 2 Fig. 3 Fig. 4 Haku

Claims (1)

[Claims] In manufacturing the waveguide V made of finely reinforced glass, a low melting point alloy with a low melting point is used as the core metal for forming the waveguide,
Furthermore, a metal is plated on a core metal of a low melting point alloy, and on this metal plated surface, aiI-free or organic fibers impregnated with resin are laminated, and heated and pressed at a temperature below the melting point of the low melting point alloy.
A waveguide characterized in that, after being hardened by heating, only the low melting point alloy of the core metal is heated and melted to leave the metal tinted surface on the inner surface of the fiber-reinforced glass waveguide to form a waveguide. manufacturing method.