JPH0364579B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to fiber-reinforced metals using continuous fibers supplied as fiber bundles made of multifilaments such as carbon fibers, carbon silicon fibers, and alumina fibers. Concerning the manufacturing method of composite materials.

[Conventional technology]

One of the manufacturing methods for this type of composite material is a wire-shaped intermediate called an infiltrated wire preform (a fiber bundle is passed through a molten matrix metal to impregnate the inside of the fiber bundle with molten metal). There is a method of heating and pressurizing a laminate of materials to form a composite.

[Problem that the invention seeks to solve]

In the above-mentioned method, there are two methods: a solid-phase press method in which the heating temperature is below the solidus line of the matrix metal, and a liquid-phase press method in which the heating temperature is conducted at a solidus-liquid phase coexistence region or a liquid phase region above the solidus line of the matrix metal.

In the former case, since the heating temperature is relatively low, the interfacial reaction between the fibers and the matrix metal during molding is suppressed and there is little material deterioration, but in order to achieve composite formation, high pressure is required, which increases equipment costs and manufacturing costs. In addition to being expensive, the bonding strength between the individual wire preforms is low, resulting in a low strength in the direction perpendicular to the fiber direction of the composite material.

Further, in the latter case, a liquid phase of the matrix is generated, so that the bonding strength between individual wire preforms is increased, and composite molding is possible in a low-pressure process, which is advantageous in terms of equipment costs and manufacturing costs. However, the interfacial reaction between the liquid phase of the generated matrix and the fibers tends to cause fiber deterioration and the formation of a brittle phase at the interface, resulting in insufficient mechanical properties in the fiber direction of the resulting composite material. Cheap.

[Means for solving problems]

The present invention involves filling the voids of a laminate in which wire preforms are arranged and filled with powder of a metal or alloy having a solidus line lower than the solidus line of the matrix metal of the preforms, or Foils of metals or alloys having a solidus lower than the solidus of the matrix metal of the preform are then laminated alternately at a temperature between the solidus of the matrix metal of the preform and the solidus of the added metal or alloy. This is a method for manufacturing fiber-reinforced metal composite materials, which is characterized by pressurizing the fiber-reinforced metal composite material.

[Effect]

According to the above method, no liquid phase is generated in the matrix of the preform during composite molding, so interfacial reactions between the fibers and the matrix can be prevented, and a liquid phase is generated in the added metal or alloy, so the bond between the preforms is strong. Therefore, the mechanical properties of the obtained composite material are excellent.

〔Example〕

Example 1 As shown in Fig. 1, powder of Al-10%Si-40%Cu alloy 2 was filled into the voids of a unidirectional laminate of silicon carbide/aluminum wire preform 1, and the powder was placed in a vacuum. The material was heated to 550° C. and pressurized at 100 kg/cm ² to form a flat composite material. In this case, the wire preform 1 is manufactured by infiltrating a bundle of precursor fired silicon carbide fibers with industrial pure aluminum (1050).
0.5mm, fiber content volume percentage 35%, tensile strength 110~120
Kg/ ^mm2 was used.

The tensile strength of the obtained composite material in the fiber alignment direction is
105Kg/mm ² , the tensile strength in the direction perpendicular to the fiber is 12
It was Kg/ ^mm2 .

On the other hand, when only wire preform 1 was composite molded without applying Al-Si-Cu alloy powder 2, a flat plate-like unidirectional product was obtained at a molding temperature of 550℃ and a molding pressure of 400Kg/ ^cm2. The tensile strength of the reinforced composite material in the direction of fiber orientation was 105 Kg/mm ² , but the tensile strength in the direction perpendicular to the fibers was at most 1.5 Kg/mm ² . In this case, the melting point of pure aluminum is 660℃, Al−10
The solidus line of the %Si-40%Cu alloy is about 520°C and the liquidus line is about 585°C.

Example 2 As shown in FIG. 2, a unidirectional laminate of a carbon fiber/aluminum wire preform 3 and an Al-
9.8%Si-1.5%Mg metal foil 4 (thickness 25μm) was filled alternately, heated to 575℃ in vacuum, and heated to 150℃.
A flat plate-shaped composite material was molded by applying pressure at Kg/cm ² .

The preform 3 used in this case was a wire-shaped bundle of high elastic modulus PAN-based carbon fibers that had undergone the necessary surface treatment and was then impregnated with molten aluminum alloy 6061, with a diameter of 0.5 mm. ,
A fiber content volume ratio of 50% and a tensile strength of 140 to 150 Kg/mm ² were used.

The tensile strength of the obtained composite material in the fiber alignment direction is
135Kg/mm ² , tensile strength in the direction perpendicular to the fibers is 8Kg/
It was warm in ^mm2 .

On the other hand, when only the wire preform was composite molded without applying the Al-9.8%Si-1.5%Mg alloy foil 4, the molding temperature was 575℃ and the molding pressure was 500Kg/cm ²
The tensile strength in the fiber direction of the flat plate-shaped unidirectionally reinforced composite material obtained was 135 Kg/mm ² , but the tensile strength in the direction perpendicular to the fibers was at most 1.5 Kg/mm ² .
Here, the solidus line of aluminum alloy 6061 is about 580℃, the liquidus line is about 650℃, and the aluminum alloy 6061 has a solidus line of about 580℃ and a liquidus line of about 650℃
The solidus line of −1.5% Mg alloy is approximately 560℃, and the liquidus line is approximately
It is 590℃.

〔Effect of the invention〕

As shown in the above-mentioned Example 2, even if the forming temperature is below the solidus line of the metal matrix of the wire preform, by using the method of the present invention, it is possible to form a material perpendicular to the fiber arrangement without impairing the tensile properties in the fiber direction. A composite material with high tensile strength in the direction can be obtained.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are diagrams for explaining an embodiment of the present invention.

Claims (1)

[Claims] 1. The voids of the laminate in which the wire preforms are arranged and filled are filled with powder of a metal or alloy having a solidus line lower than the solidus line of the matrix metal of the preforms, or the arrangement layer of the wire preforms and the matrix of the preforms are Alternating layers of metal or alloy foils having a solidus lower than the solidus of the metal are then heated at a temperature between the solidus of the preform matrix metal and the added metal or alloy. A method for producing a fiber-reinforced metal composite material characterized by pressing.