JPS591780B2 - Method for manufacturing preliminary metal moldings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a novel unidirectionally oriented sheet-like preliminary metal forming body for use in producing a metal composite material using carbon fiber as a reinforcing material.

Traditionally, metal composite materials using carbon fiber as reinforcement have been considered useful as lightweight materials with various properties.
During the manufacturing stage of composite materials, it is difficult to uniformly and firmly bond and form the base metal and the reinforcing carbon fiber, and when the carbon fiber is composited with the base metal, the carbon fiber is It was difficult to handle because it was placed in metal, making workability poor. In order to solve these difficulties and improve the uniformity of mixing as well as ease of handling, the present inventors conducted research and found that carbon fibers were ion-blasted to coat the base metal around the carbon fibers. It has been found that these problems can be solved by using a unidirectionally oriented sheet-like premetal formed body obtained by forming layers.

That is, the present invention provides a unidirectionally oriented sheet-like premetal molded body, which is characterized in that sheet-like carbon fibers oriented in one direction are subjected to ion blasting to form a base metal layer around the carbon fibers. It is a manufacturing method.

In general, in molded products made of carbon fiber-reinforced metal materials, the reinforcing material has a strong tendency to separate from the base metal when an external force is applied due to poor wettability between the carbon fiber and the metal. This drawback can be eliminated by attaching the base metal in advance.

Also, metals with relatively good wettability tend to cause chemical reactions with carbon fibers, so in order to prevent this, an extremely thin barrier layer of a few tenths of a micrometer or less is formed, and the base metal is attached on top of this. It's a good idea to leave it there. Silicon, titanium, or their carbides are effective as this barrier layer. A preformed body in which carbon fibers subjected to such treatment are arranged in a sheet shape in one direction is laminated in a direction suitable for obtaining the necessary mechanical properties for the desired molded product. gives great advantages in processing.

In the present invention, carbon fibers refer to so-called carbon fibers and graphite fibers in the commonly used sense.

In the present invention, the surface around the carbon fibers is coated with a base metal layer, but in this case titanium is added to the intermediate layer between the carbon fibers and the base metal layer for the purpose of preventing chemical reaction between the base metal and the carbon fibers.
A barrier layer of silicon or a carbide thereof may also be interposed.

The base metal is a metal such as aluminum, magnesium, zinc, titanium, nickel, or copper. In the present invention, sheet-like carbon fibers oriented in one direction are used, and a base metal layer is formed on the surface around the carbon fibers by ion blasting to form the desired sheet-like preliminary metal layer. The body is manufactured. In order to use the preformed body of the present invention to produce a metal composite material, the required number of sheet-like preformed bodies are laminated in any direction, or if necessary, base metal or dissimilar metal is layered between each sheet. After disposing foil or powder of alloy, etc., each metal is fused with each other and heated under pressure so as to be integrated, thereby making it possible to make a composite material with a carbon fiber volume ratio depending on the application.

As described above, according to the present invention, when a composite material is obtained using a sheet-like preform, the composite material can be easily handled and has carbon fibers arranged in any direction and distribution state.

The present invention will be explained below with reference to Examples.

Example 1 Untwisted 3000 filament in vacuum system, diameter 9.2μ
A sheet of 20 carbon fiber bundles oriented in a line and titanium were arranged, and after the system was evacuated to 1×1'4t0rr or less, argon gas was introduced and the argon pressure was increased to 2×1'2t0.
Plasma etching was performed for 5 minutes by applying a voltage of -1.0 KV to the carbon fiber while maintaining the carbon fiber at rr.

After etching, the carbon fiber is heated using a tantalum heater. So 2
Heat to 00°C.

On the other hand, titanium was maintained in a molten state by resistance heating, evaporated, and ionized in a glow discharge region to form a 0.2 μm titanium film on the carbon fiber. Next, aluminum was further coated with ion platein to obtain a preform having a 4 μm aluminum layer.

The carbon fiber volume ratio of this preform is 28% and the thickness is approximately 0.
．． It was wound onto a bobbin as a 37HR sheet.

Five of these sheet-like preforms were alternately laminated at right angles and heated and pressed at a vacuum degree of 2 x 10-5 t0rr) 580°C and 300~/d to sinter the aluminum and create a composite with a carbon fiber volume ratio of 28%. It was used as a material. Example 2 A sheet of 12,000 untwisted filaments and 5 carbon fiber bundles with a diameter of 7μ oriented in a row was placed in a vacuum system at 1×10−4 t0r.
After evacuation to below r, argon gas was introduced and the fiber was heated to -1.
Plasma etching was performed for 1 minute by applying a voltage of 0 KV.

After etching, the carbon fiber is heated to 300°C to evaporate silicon, and after performing ion blasting,
A heat treatment was performed at ℃ for 3 minutes to form a silicon carbide layer at the interface between the carbon fiber and silicon, resulting in a fiber with a diameter of 7.2μ.

Next, the aluminum-magnesium was evaporated by resistance heating and ion blasting was performed to obtain a preform having a 1 μm aluminum-magnesium layer.

This material was wound up as a sheet having a thickness of about 0.2ER. Further, the carbon fiber volume ratio was 60%. Seven sheets of this preformed sheet were laminated in one direction, and 5×10-5t0
rr) 480℃, 800Ky/C? Heat and pressurize at step 11,
A composite material with a carbon fiber volume ratio of 61% was obtained.

In addition, five of these preforms and aluminum foil were alternately laminated at 600°C, 900~/d) Vacuum degree 2 x engineering 0-2t0rr.
By heating and pressurizing the material, a composite material with a carbon fiber volume ratio of 30% could be obtained. Example 3 Carbon fibers and copper were arranged in the same manner as in Example 1, and the copper was evaporated by resistance heating and subjected to ion blasting.

The copper film thickness was 3μ, and the carbon fiber volume ratio was 29%. The thickness of the sheet was approximately 0.3 mm. Four of these preforms were stacked in one direction and
Heat and pressurize at 150~A℃, carbon fiber volume ratio 30
% composite material.

Claims (1)

[Claims] 1. A method for producing a unidirectionally oriented sheet-like premetal molded body, which comprises performing ion plating on sheet-like carbon fibers oriented in one direction to form a base metal layer around the carbon fibers.