JPH0753626B2 - Carbonaceous composite material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a carbonaceous composite material.

2. Description of the Related Art A metal porous electrode having a three-dimensional skeleton structure is conventionally known. For example, Ni or Zu on the surface of urethane foam
After electroplating with Cu or the like, the urethane foam is burned off to form a foam metal having communication holes to form an electrode.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional foam metal, the cross section of the three-dimensional skeleton remains as a cavity after the urethane foam is burned out.

Since it is composed only of foam metal, it has a drawback that the strength of the skeleton structure becomes small.

Then, this invention aims at providing the carbonaceous composite material which can improve strength compared with the conventional three-dimensional frame | skeleton metal porous body, for example, the composite material used for an electrode etc.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention is a glassy carbon having a crystallite size La (Å) of 300 Å or less and a specific gravity of butanol dipping method of 1.70 g / cc or less. The carbon three-dimensional skeleton structure base material made of consists of communicating holes in the skeleton, and the surface of the carbon three-dimensional skeleton structure base material is covered with a thin film of Cu, Ni or Cr conductive metal. The main point is a carbonaceous composite material.

A substrate with a three-dimensional skeleton structure is composed of glassy carbon that satisfies the specified conditions, and Cu, N is formed in a thin film on the surface of the substrate.
i, Cr conductive metal was coated.

Since the base material is made of glassy carbon and has high strength,
The strength of the composite material can be increased.

Further, even if the thickness of the thin film of the conductive metal is reduced, the problem of strength does not occur.

Example A resin (for example, a furfuryl alcohol polymer) is attached to a porous soft polyester-based urethane foam having a three-dimensional skeleton structure. For example, in the operation of impregnating a urethane foam with a furfuryl alcohol polymer,
It is preferable to impregnate using a centrifugal dewatering device so that dewatering can be performed uniformly without clogging.

After that, the resin is dried and cured at 150 ° C. After that,
950 ° C in a non-oxidizing atmosphere (for example, nitrogen atmosphere)
Bake at. By this firing, the urethane foam is carbonized, the resin becomes glassy carbon, and a base material having a glassy carbon three-dimensional skeleton structure having communication holes in the skeleton is formed.

The above-mentioned steps of impregnation → curing → firing may be repeated a plurality of times, or heating may be performed at about 2300 ° C. while contacting with chlorine gas for purification after firing.

When the crystallite size La (Å) of glassy carbon is larger than 300 Å, the crystallite is too large and the strength is reduced. If the specific gravity of the butanol dipping method is higher than 1.70 g / cc, the production becomes extremely difficult.

Cu, Ni or Cr was formed on the surface of the glassy carbon substrate of the three-dimensional skeleton structure prepared as described above by electrolytic plating.
To form a thin film of and coat the surface of each skeleton.

For example, in the case of Cu, the glassy carbon substrate is boiled and degreased at 60 ° C for 3 minutes, neutralized with 3% HCl, activated with palladium chloride, and then plated at 25 ° C for 15 minutes. .

On the other hand, in the case of Ni, after the same pretreatment as that of Cu was completed, 90 ° C
Plate for 30 minutes.

If the thickness of the thin film is less than 20 μm, the strength of the three-dimensional skeleton structure is not sufficient, and if it exceeds 2 mm, the voids of the three-dimensional skeleton structure are reduced, so 20 μm to 2 mm is preferable.

The thin film may be formed by a method other than the electrolytic plating method (for example, a plasma method, a sputtering method, a non-electrolytic plating method, a CVD method, etc.).

The composite material according to the present invention can also be used as an electromagnetic wave shielding material or a speaker cone material.

EFFECTS OF THE INVENTION According to the present invention, since the carbon three-dimensional skeleton structure substrate made of glassy carbon is provided, the strength of the composite material can be increased.

Moreover, since the carbon three-dimensional skeleton structure base material has communication holes in the skeleton, it is easy to increase the number of voids in the three-dimensional skeleton structure.

Therefore, the composite material according to the present invention can be suitably used as a composite material used for electrodes, electromagnetic wave shields, speaker cones and the like.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatoshi Kasahara 378 Oguni Town, Oguni Town, Nishiokitama District, Yamagata Prefecture Inside the Oguni Factory of Toshiba Ceramics Co., Ltd. (72) Masaaki Kanamori 378 Oguni Town, Oguni Town, Nishiokitama District, Yamagata Prefecture Address Toshiba Ceramics Co., Ltd. Oguni Factory (56) Reference JP-A-58-69786 (JP, A)

Claims (1)

[Claims] 1. A crystallite size La (Å) of 300 Å or less,
Specific gravity of butanol immersion method 1.70 g / cc or less carbon three-dimensional skeleton structure base material consisting of glassy carbon has communication holes in the skeleton, and the surface of the carbon three-dimensional skeleton structure base material Cu, Ni or A carbonaceous composite material characterized by being coated with a thin film of a conductive metal of Cr.