JPH1025173A - Joining unit of carbon material to metal, its production and plasma counter material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a joining unit of a carbon material to a metal, excellent in heat resistance, thermal conductivity and joining strength, provide a method for producing the joining unit and obtain a plasma counter material. SOLUTION: This joining unit of a carbon material to a metal is obtained by joining a carbon material 2 through a copper alloy-coated layer 1 comprising copper alloy coated carbon material containing copper and titanium to a metal body 3. This method for producing carbon material-metal joining unit comprises superposing a copper alloycoated carbon material having a copper alloy coating layer 1, formed by heating and melting a mixed layer containing copper and titanium or an alloy layer containing copper and titanium on a carbon material, through a copper alloy coated layer to a metal body 2 and then heating the superposed material. This plasma counter material of nuclear fusion device is obtained by using a carbon material-metal joining unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a carbon material-metal bonded body and a plasma facing material using the carbon material-metal bonded body, which are particularly suitable for a plasma facing material of a nuclear fusion device.

[0002]

2. Description of the Related Art Since carbon materials have excellent heat resistance, thermal conductivity and chemical stability, they are extremely useful as various members used at high temperatures. In order to take advantage of these excellent features, and to improve cooling efficiency and reinforce mechanical strength, metallurgically bonded members of carbon materials and metals are used as plasma-facing materials for fusion devices and members for semiconductor manufacturing devices. Etc. are required. As a method of metallurgical joining between a carbon material and a metal, brazing between a carbon material and a metal via a brazing material is generally performed.

However, in the case of mere brazing, there is a problem that both are easily peeled off due to a difference in thermal expansion coefficient between the carbon material and the metal, and reliability such as bonding strength is low. As a method for solving such a problem, for example, Japanese Patent Application Laid-Open No. 5-1862
No. 76 discloses that a carbon fiber reinforced carbon composite material (C / C composite material) having a dense surface and a sparse interior is HIP (Hot Isos).
We propose a material that impregnates a high thermal conductivity material such as copper with a tatic press (hot isostatic press), has a gradient function in which the composition of copper changes gradually, and reduces the difference in thermal expansion. . Further, Japanese Patent Application Laid-Open No. 63-310778 proposes a method of metallizing a bonding surface of a carbon material and then bonding the carbon material to a metal substrate via a stress relaxation layer such as nickel.

[0004] In a plasma facing material or the like of a nuclear fusion device, in order to effectively utilize the heat resistance and chemical stability of a carbon material, a metal is contained on a surface opposite to a bonding surface (plasma facing surface). It is necessary not to be. Also,
In order to take advantage of the joining, it is necessary not to lower the thermal conductivity. In the method disclosed in JP-A-5-186276, the penetration depth of copper by pressure impregnation depends on the pore distribution of the C / C composite. For this reason, strict control of the pore distribution is required in order to make the plasma facing surface contain no metal at all and to have a sufficient copper content in the joint surface. Such a C / C composite material Is difficult to mass produce.

On the other hand, in the method disclosed in Japanese Patent Application Laid-Open No. 63-310778, bonding is performed via a stress relaxation layer, so that bonding is performed on two surfaces, and the bonding process is complicated. Further, since the metallized layer and the carbon material have different coefficients of thermal expansion, peeling may occur from the interface due to thermal stress. In addition, silver brazing material is often used for such joining, but since silver brazing material has a low melting point, when used at high temperatures such as nuclear fusion, heat resistance becomes a problem.
In addition, there is a major problem that the activation of silver when exposed to neutrons deteriorates the brazing material and lowers the bonding strength.

[0006]

The present invention solves these problems. The first aspect of the present invention is to provide a copper alloy-coated carbon material having excellent bonding property with metal, heat resistance and thermal conductivity. Further, the invention according to claim 2 provides a method for producing a copper alloy-coated carbon material excellent in bondability with metal, heat resistance and thermal conductivity relatively easily. The third aspect of the present invention is to provide a plasma facing material which is low in radiation and excellent in bonding property to metal, heat resistance and thermal conductivity.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a carbon material-metal bonded body in which a carbon material and a metal body are bonded via a copper alloy coating layer of a copper alloy coated carbon material containing copper and titanium. The present invention also provides a copper alloy-coated carbon material formed by heating and melting a mixture layer containing copper and titanium or an alloy layer containing copper and titanium on a carbon material to form a copper alloy coating layer. The present invention relates to a method for producing a carbon material-metal bonded body, which is arranged so as to be superposed on a metal body via an interposition and then heated. Further, the present invention relates to a plasma facing material of a nuclear fusion device using the carbon material / metal bonded body.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The carbon material used in the present invention is:
There are generally known isotropic and anisotropic artificial graphite materials, carbon fiber reinforced carbon composite materials (C / C composite materials), and the like, although there is no particular limitation. The copper alloy is preferable because it enters the open pores of the carbon material to improve the adhesive strength, and it is more preferable to use a carbon material having an open porosity of 3% or more. The open porosity P (volume%)
Are: W1: dry weight (g), W2: weight in water (g), W
3: The weight of saturated water (g) is measured and calculated by the following equation (underwater replacement method).

[0009]

(Equation 1)

Further, in order to improve the adhesive strength and reduce the difference in the coefficient of thermal expansion, etc., it is possible to use a carbon material obtained by subjecting a carbon material to holes or grooves. In this case, the ratio of the area of the opening of the hole or groove is 2 to the area of the copper alloy coating.
A range from 0 to 80% is preferred. In mixed powders containing copper and titanium or alloy powders containing copper and titanium (hereinafter referred to as mixed powders or alloy powders), copper is used because of its high thermal conductivity, melting at a relatively low temperature, low cost, etc. At the same time, because copper is generally used for the cooling body, there is an advantage that joining with the cooling body becomes easy. However, melting copper alone does not wet the carbon material and does not adhere to it, so it is necessary to add an active metal that improves wettability and adhesiveness. Uses titanium, which largely reacts with the carbon material to form carbide.

The use of titanium contributes to improvement of copper wettability and adhesion of copper and a carbon material by titanium carbide. on the other hand,
From the point of view of thermal conductivity, there is a tendency to lower the excellent thermal conductivity of copper. Therefore, to increase the thermal conductivity,
It is preferable that the amount of titanium contained in the mixed powder or the alloy powder is only the amount necessary for improving the wettability and bonding, so that the decrease in thermal conductivity is minimized. Specifically, the weight composition of the mixed powder or alloy powder is 98 to 60% by weight of copper and 2 to 2% of titanium in terms of the effect of improving the wettability, adhesion, thermal conductivity, thermal shock resistance, and the like. The content is preferably in the range of 40% by weight, more preferably 96 to 70% by weight of copper and 4 to 30% by weight of titanium. As the metal forming the mixture layer or the alloy layer using the mixed powder or the alloy powder, metals other than copper and titanium may be included to such an extent that the effects of the present invention are not impaired, but the characteristics are excellent and the characteristics are relatively low. From the viewpoint of cost, those made of copper and titanium are preferred.

In the present invention, a copper alloy coating layer obtained by heating and melting a mixture layer containing copper and titanium or an alloy layer containing copper and titanium has excellent bonding properties with a metal body as a cooling body. It is preferable to adopt one of the two structures.
One is a layer structure in which the titanium concentration decreases intermittently or continuously from the interface with the carbon material toward the surface of the copper alloy. The other is that a layer of copper is formed on a layer in which the titanium concentration decreases intermittently or continuously from the interface with the carbon material toward the surface of the copper alloy or on a copper alloy coating layer having a uniform titanium concentration. Layer structure. These scenes are from XMA
(X-ray Micro Analyzer: X-ray surface minute part analyzer) or the like.

In the present invention, the carbon material-to-metal joint is formed by joining a carbon material and a metal body via a copper alloy coating layer of a copper alloy coating carbon material containing copper and titanium. This means that the copper alloy coating layer only needs to be interposed between the carbon material and the metal body, and a copper layer formed on the copper alloy coating layer is inserted between the carbon material and the metal body. Can be interposed. In the present invention, it is preferable to have a layer structure in which a copper layer is further formed on the copper alloy coating layer because the bondability with the metal body is excellent. The thickness of the entire copper alloy coating layer and the copper layer (hereinafter referred to as a metal composite layer) is not particularly limited, but is preferably 0.05 to 3 mm as a whole from the viewpoint of bondability, and 0.1 to 2 mm. It is more preferable in terms of thermal conductivity, workability and the like. The thickness of the metal composite layer does not change even after joining.

[0014] The carbon material-metal bonded body according to the present invention is obtained by obtaining a copper alloy-coated carbon material having the above-mentioned copper alloy-coated layer or metal composite layer formed on a carbon material, and then forming the copper alloy-coated layer or the metal composite layer. It is obtained by arranging and heating a metal body so as to be in contact therewith. Further, as one method of producing the copper alloy-coated carbon material, on the carbon material, two or more layers of a mixture layer containing copper and titanium or an alloy layer containing copper and titanium, or each of the above layers A copper layer is further arranged on the layer, and in the case of the arrangement, when the above-mentioned each layer becomes two or more layers, the mixing ratio of titanium in the total amount of the metal of the mixture of each layer shall be smaller as the upper layer, and these Is heated and melted to form an integral copper alloy coating layer. In this case, the heating and melting may be performed after forming all the layers, or may be performed for each layer. It is preferable to dispose a layer containing only copper not containing titanium as the uppermost layer because the bonding property with the metal body made of copper is good.

In the above method, there are various arrangement methods depending on the type of the mixture containing copper and titanium or the alloy containing copper and titanium arranged in layers. One method is to use a copper alloy foil or a copper alloy plate instead of a mixture containing copper and titanium or an alloy containing copper and titanium. In this case, it can be heated and melted by arranging it on a very thin layer or two or more layers of a carbon material, and optionally arranging a copper powder, a copper foil or a copper plate thereon. When two or more layers of copper alloy foil or copper alloy plate are used, the one in which the proportion of titanium in the total amount of metal in the foil or plate-like copper alloy is lower as the layer is higher is used. The thickness of the copper alloy foil or copper alloy plate as a whole is preferably 0.1 μm to 2 mm from the viewpoint of thermal conductivity,
0.1 μm to 1 mm is more preferable, and 0.1 to 100 μm
Is more preferable. In the case where a layer made of only copper is further provided, the thickness of the copper layer is not particularly limited, but is preferably 0.05 to 3 mm from the viewpoint of bonding properties and the like.

As another method, a mixed powder or an alloy powder can be used as a mixture containing copper and titanium or an alloy containing copper and titanium. Two or more layers may be arranged on a carbon material, and a copper powder, a copper foil or a copper plate may be arranged on the carbon material, and then heated and melted. When two or more layers of the mixed powder or the alloy powder are used, the mixing ratio of the titanium in the total amount of the metal of the mixed powder or the alloy powder is such that the lower the proportion, the higher the layer. When copper and titanium are used as a powder or when an alloy containing copper and titanium is used as a powder, these may be simply mixed and used as a powder, or the alloy powder may be used as it is. It is preferable to use a method in which a paste is formed by adding a binder, a solvent, and the like, and the paste is applied to a carbon material, dried, and then heated and melted, because more uniform coating can be performed.

In the above-mentioned method of using the paste, a known thermosetting resin, thermoplastic resin or the like is used as an organic binder, and there is no particular limitation. Since carbon remaining in the alloy increases, it is preferable to use an organic binder having a low carbonization rate such as an acrylic resin, an epoxy resin, polyvinyl alcohol, methyl cellulose, and ethyl cellulose. Further, the solvent is preferably one having a boiling point of 100 to 200 ° C. from the viewpoint of the stability and workability of the paste. Specifically, an organic solvent such as ethylene glycol or butanol or water is considered in consideration of compatibility with an organic binder. It is more preferable to select and use them. Also in this case, the thickness of the titanium-containing layer to be disposed is preferably 0.1 μm to 2 mm, more preferably 0.1 μm to 1 mm, and more preferably 0.1 μm to 1 mm from the viewpoint of thermal conductivity.
More preferably, it is 00 μm. In the case where a layer made of only copper is further provided, the thickness of the copper layer is not particularly limited, but is preferably 0.05 to 3 mm from the viewpoint of bonding properties and the like.

The mixing ratio of the mixed powder or alloy powder, the organic binder and the solvent is such that the mixed powder or alloy powder is 50 to 90% by weight and the organic binder is 5 to 40% in terms of workability of the paste and densification of the coating layer. % By weight and the solvent is preferably in the range of 5 to 40% by weight, and the mixed powder or alloy powder is 60 to 90% by weight;
More preferably, the content of the organic binder is 5 to 30% by weight and the content of the solvent is 5 to 30% by weight.
More preferably, the content is 90% by weight, the organic binder is 5 to 25% by weight, and the solvent is 5 to 25% by weight.
These components are blended so that the total composition becomes 100% by weight.

Further, as another method of forming the coating layer,
A molded body of a copper alloy foil or a copper alloy plate, which is previously or intermittently or continuously reduced from a layer having a large proportion of titanium to a layer having a small proportion of titanium or a layer having the above-mentioned layered structure or a uniform proportion of titanium A molded body (graded material) including a layer of only copper is further manufactured on the carbon material, and a layer having a large proportion of titanium is disposed on the carbon material with the layer having a large proportion of titanium as a carbon material side, and heated and melted to form an integral coating layer. The method can also be performed. Also in this case, the thickness of the titanium-containing layer of the inclined material is preferably 0.1 μm to 2 mm from the viewpoint of thermal conductivity, and 0.1 μm to 1 mm.
Is more preferable, and further preferably 0.1 to 100 μm. In the case where a layer made of only copper is further provided, the thickness of the copper layer is not particularly limited, but is preferably 0.05 to 3 mm from the viewpoint of bonding properties and the like.

In this method, the gradient material is metal-coated by a method using a copper alloy foil or a copper alloy plate as the mixture containing copper and titanium or a method using a mixed powder or an alloy powder as a mixture containing copper and titanium. Only a layer or an alloy coating layer is first prepared, and this layer is arranged on a carbon material with the layer having a high proportion of titanium as the carbon material side, and heated and melted to form an integral coating layer.

In the heat melting performed by each method, since the copper, titanium, and carbon materials easily react with oxygen, it is preferable that the atmosphere is free of oxygen. Since titanium also reacts with nitrogen, it is preferable that the atmosphere be free of nitrogen. For such a reason, it is preferable to perform the heating and melting in a vacuum or in an inert gas atmosphere other than nitrogen. When performing heat melting in a vacuum, the degree of vacuum is preferably 1 Pa or less, and more preferably 0.1 Pa or less, in order to prevent oxidation.

When the atmosphere is an inert gas other than nitrogen, it is preferable to use a high-purity gas containing a small amount of oxygen, nitrogen and the like, and to use a gas containing 20 ppm or less of oxygen impurities and nitrogen impurities. As the inert gas, argon, helium and the like are preferable. Heat melting temperature is 900 ~
1600 ° C. is preferred because there is no change in the meltability and composition, and 950 ° C. or more is more preferred in view of the meltability,
1050 ° C. or higher is more preferable. An integral coating layer is formed by the above heating and melting. Thus, a coating layer of a copper alloy containing titanium is formed on the carbon material.

The carbon material and the metal body are joined via a copper alloy coating layer of a copper alloy coating carbon material containing copper and titanium. As a joining method, a copper alloy coating surface of the copper alloy coating carbon material is used. After polishing and exposing a flat surface, the one cleaned and cleaned, and after polishing the metal body and exposing a flat surface, washed and cleaned, the copper alloy coated surface comes into contact with the metal body And heat treatment is performed. When a copper layer is formed on the copper alloy coating layer of the copper alloy-coated carbon material, the surface of the copper layer is polished to obtain a flat surface, and then cleaned and cleaned. After the body is polished to make a flat surface, the cleaned and cleaned one is overlaid so that the copper layer is in contact with the metal body, and a heat treatment is performed.

The better the flatness of the copper alloy-coated carbon material and the metal body or the copper layer, the better. In addition, during the heat treatment, the copper alloy-coated carbon material or the copper layer may be merely overlapped with the metal body, but when a load is applied, the copper alloy-coated surface or the copper layer surface and the metal body are in close contact with each other. preferable.
However, if a too large load is applied, the carbon base material of the copper alloy-coated carbon material is broken, or the metal body is significantly deformed. Therefore, the load is preferably 0.01 MPa to 10 MPa,
1 MPa to 10 MPa is more preferable. The temperature of the heat treatment is
In order to avoid melting deformation of the metal body, the temperature is not higher than the melting point of the metal body used, and the temperature at which the composition of the copper alloy of the copper alloy-coated carbon material does not change, that is, when using copper as the metal body, 900 ° C from the melting point of 1083 ° C
-1080 ° C. is preferred, and 95% from the viewpoint of the softening property of the copper alloy.
0 ° C to 1080 ° C is more preferable.

The metal body used in the present invention is not particularly limited, but from the viewpoint of melting point, thermal conductivity and the like, metal body made of a metal such as copper, molybdenum, tungsten, iron, titanium or an alloy thereof. In particular, a metal body made of copper or a copper alloy is more preferable in terms of workability, low cost, and the like.

In the heat treatment for joining the copper alloy-coated carbon material and the metal body, the atmosphere is preferably free of oxygen because the copper, titanium and carbon materials are liable to react with oxygen. Since titanium also reacts with nitrogen, it is preferable that the atmosphere be free of nitrogen. For this reason, the heat treatment is preferably performed in a vacuum or in an inert gas atmosphere other than nitrogen. When performing heat treatment in vacuum,
To prevent oxidation, the degree of vacuum is preferably a high vacuum of 1 Pa or less, and more preferably a high vacuum of 0.1 Pa or less.

When the atmosphere is an inert gas other than nitrogen, it is preferable to use a high-purity gas containing a small amount of oxygen, nitrogen or the like, and to use a gas containing 20 ppm or less of oxygen impurities and nitrogen impurities. As the inert gas, argon, helium and the like are preferable. By the above heat treatment, a carbon material / metal bonded body can be manufactured. The carbon material-metal bonded body obtained as described above can be used as a plasma facing material having high thermal shock resistance, high bonding strength, high reliability, and high thermal conductivity.

The above-mentioned metal body refers to a body that functions to cool the joined copper alloy-coated carbon material. The structure preferably has a structure capable of performing cooling with a liquid such as gas or water in order to increase cooling efficiency.For example, a through hole for flowing a coolant through a block-shaped or plate-shaped metal body is preferably provided. It is preferable to use a structure provided, a structure in which a pipe through which a refrigerant flows is joined to a metal body, or the like. A cross-sectional view of one example is shown in FIG. The carbon material 2 and the copper alloy coating layer 1 are joined. The copper alloy coating layer 1 is joined to the metal body 3 by a heat treatment. A cooling pipe 5 through which a coolant flows is formed in the metal body 3.

[0029]

Next, embodiments of the present invention will be described. Examples 1 to 4 and Comparative Examples 1 and 2 Two-dimensional C / C processed to dimensions of 25 mm × 25 mm × 25 mm
A composite material (manufactured by Hitachi Chemical Co., Ltd., trade name PCC-2S, open porosity 8%) was used as a base material. Copper powder (Fukuda Metal Foil & Powder Co., Ltd.) is used as a material for forming the coating layer.
Electrolytic copper powder) and titanium powder (manufactured by Kojundo Chemical Laboratory, average particle size: 10 μm). These mixed powders were used in the mixing ratio shown in Table 1, and each of the mixed powder and copper powder was used. 6
30% by weight of an alkyd resin (trade name: V901, manufactured by Hitachi Chemical Co., Ltd.) and 10% by weight of butanol were added to 0% by weight and mixed to form a paste. 3 was applied with the mixed powder paste, and in Examples 2 and 4, the mixed powder paste and the copper powder paste were applied in this order so as to have the thickness shown in Table 1, and then in a vacuum atmosphere of 0.1 Pa. And heated and melted at 1300 ° C. and maintained for 1 hour to obtain a copper alloy-coated carbon material. The copper alloy-coated surface of the obtained copper alloy-coated carbon material was polished and cleaned, and the polished and cleaned 25 mm x 25 mm x 25 mm
Is placed on the copper block with the copper alloy coated surface so as to be in contact with the copper alloy, and after applying a load of 2 MPa, it is heated to the temperature shown in Table 1 in a vacuum atmosphere of 0.1 Pa and held for 30 minutes to obtain carbon. A material copper joined body was obtained.

A test piece for measuring thermal conductivity was obtained by cutting to a thickness of 5 mm including the bonding surface of the obtained carbon material copper bonded body, and using TC-7000 manufactured by Vacuum Riko Co., Ltd. The thermal conductivity was measured. Table 1 shows the results. However, in the above test, Comparative Example 1 measured the thermal conductivity of a carbon material not coated with a copper alloy and bonded to a copper block using a titanium-containing silver brazing material. The rate was measured.

Further, with respect to the carbon material copper bonded bodies obtained in the above Examples and Comparative Examples, the bonded body breaking strength was measured at a high temperature (850 ° C.) using a tensile tester. The speed of the crosshead was 0.5 mm / min. The joint breaking strength was calculated from the obtained breaking load by the following equation. Table 1 also shows the results. However, in the above test, Comparative Example 1 measured the breaking strength of a carbon material that did not destroy the copper alloy and was bonded using a copper block and a titanium-containing silver solder, and Comparative Example 2 measured the strength of the substrate alone. . As a result, in the case of joining using the titanium-containing silver brazing material of Comparative Example 1, the brazing material was melted and broken at the joining surface. Moreover, about what joined by using the copper alloy covering which is this invention, and did not use brazing material, Examples 1-4 destroyed inside the base material.

[0032]

(Equation 2) Here, T is the joint breaking strength (MPa), P is the breaking load (N), and A is the cross-sectional area of the sample (mm ² ).

[0033]

[Table 1]

Examples 5 to 8 and Comparative Examples 3 and 4 One-dimensional C / C processed to dimensions of 225 mm × 25 mm × 25 mm
A composite material (HUD-1S, manufactured by Hitachi Chemical Co., Ltd.) was used as a base material. Copper powder (electrolytic copper powder, manufactured by Fukuda Metal Foil Powder Co., Ltd.) and titanium powder (manufactured by Kojundo Chemical Laboratory, average particle size: 10 μm) were used as materials for forming the coating layer.
The powder mixture of each layer was mixed at the compounding ratio shown in Table 2, and then the powder mixture and the copper powder were mixed on the base material, respectively, for Example 5 and Example 7, and Example 6 and Example 8 As for the mixed powder and the copper powder, they were arranged in layers so as to have a predetermined thickness shown in Table 2 in this order, and were pressed and formed into an integrated molded body. After arranging the molded body on the C / C composite with the layer having a large proportion of titanium as the C / C composite side, the molded body was heated to 1200 ° C. in an argon gas atmosphere (oxygen and nitrogen impurities are each 10 ppm or less). After melting and holding for one hour, a copper alloy-coated carbon material was obtained. The copper alloy-coated surface of the obtained copper alloy-coated carbon material was polished and washed, and the polished and washed copper block having a size of 25 mm × 25 mm × 25 mm was overlapped with the copper alloy-coated surface so that the surface of the copper alloy-coated surface was in contact with the copper block. After applying a load of 2 MPa, each was heated to a temperature shown in Table 2 and maintained for 30 minutes in an argon gas (oxygen impurity and nitrogen impurity each being 10 ppm or less) atmosphere to obtain a carbon material copper joined body.

[0035] The obtained carbon material copper joined body was cut so as to have a thickness of 5 mm including the joint surface to obtain a test piece for measuring thermal conductivity, and the thermal conductivity was measured. Table 2 shows the results. However, in the above test, Comparative Example 3 measured the thermal conductivity of a carbon material not coated with a copper alloy and joined to a copper block using a titanium-containing silver brazing material.
Measured the thermal conductivity of the substrate alone.

Further, with respect to the carbon material copper joints obtained in the above Examples and Comparative Examples, the joint breaking strength was measured in the same manner as in Example 1. However, Comparative Example 3 measured the breaking strength of a carbon material not coated with a copper alloy and joined using a copper block and titanium-containing silver solder, and Comparative Example 4 measured the strength of a single substrate. As a result, Comparative Example 3
When the brazing material was joined using the titanium-containing silver brazing material, the brazing material was melted and easily broken at the joining surface. In the copper alloy coating according to the present invention, which was joined without using a brazing material, the copper alloy coating layers of Examples 5 to 8 were softened and fractured at the joint surface.

[0037]

[Table 2]

As shown in Tables 1 and 2, the carbon material-metal bonded body according to the embodiment of the present invention has better heat resistance, better thermal conductivity and better bonding strength than those of the comparative example. Is shown.

[0039]

According to the first aspect of the present invention, there is provided a carbon material-metal bonded body.
It has excellent heat resistance, thermal conductivity and bonding strength, and is useful for plasma facing materials such as nuclear fusion devices. According to the method for manufacturing a carbon material / metal bonded body of the second aspect, a carbon material / metal bonded body excellent in heat resistance, thermal conductivity, and bonding strength can be obtained. The plasma facing material according to claim 3 is excellent in heat resistance, thermal conductivity and bonding strength, and has low radiation. Therefore, it is particularly useful as a plasma facing material for a nuclear fusion device.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a plasma facing material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copper alloy coating layer 2 Carbon material 3 Metal body 4 Joining surface 5 Cooling tube

Claims (3)

[Claims] 1. A carbon material-metal bonded body comprising a carbon material and a metal body, wherein the carbon material is a copper alloy-coated carbon material containing copper and titanium, which is bonded via a copper alloy coating layer. 2. A copper alloy-coated carbon material formed by heating and melting a mixture layer containing copper and titanium or an alloy layer containing copper and titanium on a carbon material to form a copper alloy coating layer, through the copper alloy coating layer. A method for producing a carbon material-metal bonded body, comprising: placing a metal body on a metal body; 3. A plasma facing material for a nuclear fusion device using the carbon-metal bonded article according to claim 1.