JP2005133141A - Metal based carbon fiber-reinforced composite material, and production method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal based carbon fiber-reinforced composite material as an industrial member having high elasticity, low thermal expansion and excellent heat resistance and applicable to an extreme environment such as aerospace or to ultraprecise industrial machinery such as a semiconductor and a liquid crystal panel, and to provide a production method therefor. <P>SOLUTION: The metal based carbon fiber-reinforced composite material has a sandwich structure in which an isotropic carbon material having a carbon material produced by molding carbon granulates such as a CIP material, an extruded material, a molded material or a short fiber molded body is used as a core material 2, and skin materials 1 composed of carbon fiber are arranged outside the core material. Further, metal in a molten state is press-fitted to the carbon material under high pressure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a metal-based carbon fiber reinforced composite that is an industrial member with excellent elasticity, low thermal expansion, and excellent heat resistance, applicable to extreme environments such as aerospace, or ultra-precision industrial machinery applications such as semiconductors and liquid crystal panels. The present invention relates to a material and a manufacturing method thereof.

  In the outer space where the planetary exploration satellite is placed, the members that make up the planetary exploration satellite are simultaneously exposed to high vacuum, high temperature, and low temperature. In recent years, metal-based carbon fiber reinforced composite materials have been recognized as materials that can satisfy strength, rigidity, and low thermal expansion in such extreme environments.

  As this metal-based carbon fiber reinforced composite material, a carbon fiber having a high elastic modulus and almost no thermal expansion is used as a reinforcing material, and aluminum, copper, magnesium and alloys thereof are used as a base material. (For example, refer to Patent Document 1).

In addition, this metal-based carbon fiber reinforced composite material requires dimensional stability against temperature changes and high elasticity, so it is currently attracting attention for applications such as semiconductor manufacturing equipment, liquid crystal panel manufacturing equipment, and various robot arms. ing.
JP 2002-294359 (2nd page, FIG. 1)

  However, for satellite applications as described above, metal materials, carbon fiber reinforced resin composite materials, etc. are used, but due to drawbacks such as thermal expansion, degassing characteristics under vacuum, and elastic modulus, It was difficult to design.

  In addition, semiconductor manufacturing equipment and liquid crystal panel manufacturing equipment, etc., which are industrial applications as described later, have conventionally been composed of parts mainly made of ceramics such as alumina. In terms of increasing the size and processing capability of the corresponding manufacturing equipment, it is said that it has reached the limit in terms of workability, weight, and strength, and we are trying to replace such constituent materials with metal-based carbon fiber reinforced composite materials. Yes.

As described above, although it is a metal-based carbon fiber reinforced composite material that has recently been attracting attention in terms of performance, its production method has been difficult so far and has not been widely spread.
That is, conventionally, a carbon fiber reinforced carbon composite material (hereinafter abbreviated as C / C material), which is a normal reinforcing material, was impregnated with a metal component by immersing it in a molten metal. Although a high temperature state in which the metal melts is necessary, depending on a metal such as aluminum, a carbon and carbide formation reaction occurs, so that it is difficult to form a homogeneous composite.

  Therefore, the present invention provides a metal-based carbon fiber reinforced composite material that is excellent in high elasticity, low thermal expansion, and heat resistance as compared with conventional materials and has a high degree of freedom in material design according to the purpose, and a method for producing the same. With the goal.

In order to achieve the above object, the present inventor has intensively studied, and as a result, has found that the carbon matrix and the isotropic carbon material are impregnated with a metal matrix in a carbon member having a sandwich structure.
That is, the metal-based carbon fiber reinforced composite material according to claim 1 has a sandwich structure in which the carbon portion has a three-layer structure in which an isotropic carbon material is used as a core material in the center and carbon fibers are arranged on the outside. It is characterized by taking.
A metal-based carbon fiber reinforced composite material according to claim 2 is the metal-based carbon fiber reinforced composite material according to claim 1, wherein the isotropic carbon material is formed by molding carbon powder particles such as a CIP material, an extruded material, a molding material, and a short fiber molded body. It is characterized by being made of carbon material.
A metal-based carbon fiber reinforced composite material according to claim 3 is the composite material according to claim 1 or 2, wherein the carbon fiber is a woven material, a 0/90 degree laminated material, a unidirectional laminated material, a chop material, and a combination thereof. It is characterized by being.
The metal-based carbon fiber reinforced composite material according to claim 4 is characterized in that, in any one of claims 1 to 3, the metal group is aluminum, copper, magnesium, and an alloy thereof.
In the method for producing a metal-based carbon fiber reinforced composite material according to claim 5, a carbon material is produced by molding a carbon powder such as a CIP material, an extruded material, a molding material, and a short fiber molded body. It is a sandwich structure composed of a three-layer structure in which an isotropic carbon material having a central core material and carbon fibers are arranged on the outside, and metal is pressed into the carbon material at a high pressure in a molten state. Features.
The method for producing a metal-based carbon fiber reinforced composite material according to claim 6 is the method according to claim 5, wherein the carbon fiber is a woven material, a 0/90 degree laminated material, a unidirectional laminated material, a chop material, and a combination thereof. It is characterized by being.
The method for producing a metal-based carbon fiber reinforced composite material according to claim 7 is characterized in that, in claim 5 or 6, the metal group uses aluminum, copper, magnesium, and alloys thereof.

According to the present invention, a carbon member having a sandwich structure of carbon fibers and an isotropic carbon material is effectively impregnated with a metal matrix, thereby improving the disadvantages of the conventional metal-based carbon composite material, and having high elasticity and low thermal expansion. It is possible to provide a high-performance metal-based carbon fiber reinforced composite material that is excellent in heat resistance and has a high degree of freedom in material design according to the purpose.
Further, according to this production method, the metal-based carbon fiber reinforced composite material can be easily produced without causing a carbide-forming reaction between the metal and carbon, and thus can be widely spread in the industry.

Next, a metal-based carbon fiber reinforced composite material according to the present embodiment and a manufacturing method thereof will be described.
The metal-based carbon fiber reinforced composite material according to the present embodiment includes a central core material 2 whose carbon part forms the center and a skin material 1 disposed on the outer periphery or the upper and lower surfaces thereof, and is entirely impregnated with metal. ing.

  The core material 2 in the central portion uses various isotropic carbon materials, and the role thereof is as a core material of the whole material and has a role of uniformly impregnating the metal to the material center because it has appropriate pores. . As the isotropic carbon material that can be applied, depending on its production method, any of molding materials, extruded materials, CIP materials, short fiber molding materials, etc. are preferably used, but porosity, density, thermal expansion coefficient, strength From the viewpoint of price and the like, a molding material and an extruded material are more preferable.

  The skin material 1 disposed on the outer side is made of carbon fiber, and a woven material, a 0/90 degree laminated material, a unidirectional material, a chop material, and a combination thereof can be used properly according to the application. In particular, from the viewpoint of performance design of thermal expansion and elastic modulus, the degree of freedom in material performance design is greatly expanded by selecting the outer carbon fiber material compared to conventional C / C materials.

  For example, for applications that give directionality to mechanical properties and thermal expansion, use 0/90 degree laminated materials or unidirectional laminated materials, and use woven materials or chopping materials when isotropic properties are desired. It is desirable.

  As a method of bonding carbon fibers to isotropic carbon, a method of bonding using a resin adhesive such as an epoxy resin or a phenol resin, or a carbon bond using a carbonaceous binder such as tar pitch or self-sintering carbon. A method such as a method or a method of filling in a mold and adhering at the time of metal impregnation is employed.

  As described above, aluminum, copper, magnesium and alloys thereof can be applied to the metal impregnated in the whole, that is, matrix metal, but aluminum is most preferable because of its low melting temperature.

As an impregnation method, an isotropic carbon / carbon fiber composite material placed in a mold container is heated to an impregnation temperature in advance, and separately heated and melted metal is poured therein. At the same time, a pressure of 500 kg or more per 1 cm ² is applied, and the metal is instantaneously pressed between the carbon fibers and inside the isotropic carbon pores.

  With this manufacturing method, a metal-based carbon fiber reinforced composite material can be manufactured without causing a carbide-forming reaction between the metal and carbon. However, the metal impregnation method enables the carbon material portion to be impregnated to be isotropic. This is because it has a sandwich structure of carbonaceous material and carbon fiber.

  The metal-based carbon fiber reinforced composite material and the manufacturing method thereof according to this embodiment and this example have been described above. However, the above-described embodiment and example are examples of the preferred embodiment of the present invention. The present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention.

It is a schematic diagram of the metal-based carbon fiber reinforced composite material according to the present embodiment.

Explanation of symbols

1 Skin material 2 Core material

Claims (7)

  A metal-based carbon fiber reinforced composite material characterized in that the carbon portion has a sandwich structure composed of a three-layer structure in which an isotropic carbon material is a core material in the central portion and carbon fibers are arranged on the outside.   2. The metal according to claim 1, wherein the isotropic carbon material is a carbon material produced by molding carbon powder particles such as a CIP material, an extruded material, a molding material, and a short fiber molded body. Base carbon fiber reinforced composite material.   The metal-based carbon fiber reinforced composite material according to claim 1 or 2, wherein the carbon fiber is a woven material, a 0/90 degree laminated material, a unidirectional laminated material, a chop material and a combination thereof. .   The metal-based carbon fiber reinforced composite material according to any one of claims 1 to 3, wherein the metal group is aluminum, copper, magnesium, or an alloy thereof.   Isotropic carbon material with carbon material produced by molding carbon powder such as CIP material, extruded material, embedding material, short fiber molding, etc., as the core material in the center, and on the outside A method for producing a metal-based carbon fiber reinforced composite material, characterized by having a sandwich structure composed of a three-layer structure in which carbon fibers are arranged, and pressing a metal into the carbon material in a molten state at a high pressure.   6. The metal-based carbon fiber reinforced composite material according to claim 5, wherein the carbon fiber is a woven material, a 0/90 degree laminated material, a unidirectional laminated material, a chop material and a combination thereof. Method.   The method for producing a metal-based carbon fiber reinforced composite material according to claim 5 or 6, wherein the metal group is aluminum, copper, magnesium, or an alloy thereof.

Images