Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1990-10-05
1993-03-02
Lieberman, Paul
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252511, 264 291, 264105, 264118, 264119, 423445, 423448, H01B 104, C01B 3100
Patent
active
051906961
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a carbonaceous material. More particularly, the present invention relates to a process for the preparation of a carbonaceous molded body having a light weight and an excellent elasticity.
BACKGROUND ART
In general, a carbonaceous molded body is prepared by adding a binder to a powder of a carbonaceous material such as graphite or coke, kneading the mixture, molding and curing the mixture, and if necessary, firing and graphitizing the molded and cured body. Since the properties required for the prepared carbonaceous molded body differ according to the intended purpose and use of the molded body, various preparation processes have been adopted, and various proposals have been made on the molding method and the kind of the binder (see, for example, "Guide to Carbon Materials", revised edition, page 135, compiled by the Association of Carbon Materials; Mizushima and Okada, "Carbon Materials", page 55, published by Kyoritsu Shuppan; and Ishikawa and Nagaoki, "New Carbon Technology", page 173, published by Kindai Henshusha).
These conventional carbonaceous molded bodies retain characteristic properties of carbon, such as light weight, high strength, high Young's modulus, electroconductivity, corrosion resistance, heat resistance and slidability. High Young's modulus of the conventional materials is relatively advantageous when a high rigidity is required. However, the conventional materials are defective in that the pliability is poor, and from the viewpoint of safety, a material having a higher strength is now required.
We previously proposed an elastic graphite body having excellent elasticity characteristics as the carbonaceous material (Japanese Patent Laid-Open Publication No. 1-9808). This elastic graphite body has a light weight and a good elasticity, and has excellent characteristics not possessed by the conventional carbonaceous materials.
However, although this carbonaceous material per se has good characteristics, since the material is in the form of a powder or granule, the material cannot be used singly, but the material should be mixed with other material or be used in the state of being packed in a vessel. Furthermore, even if the material is placed in such a restricted state, it is not easy to mold the material while sufficiently utilizing excellent properties possessed inherently by the material.
DISCLOSURE OF THE INVENTION
The present invention has been completed under the above-mentioned background, and it is an object of the present invention to provide a novel carbonaceous molded body having a light weight and an excellent compressive elasticity.
The characteristic feature of the present invention resides in a process for preparing such a carbonaceous molded body without degrading elasticity characteristics possessed inherently by elastic graphite particles as the constituent material.
More specifically, in accordance with the present invention, there is provided a process for the preparation of a carbonaceous molded body, which comprises mixing elastic graphite particles with a binder and molding the mixture to obtain a carbonaceous molded body having a light weight and an excellent elasticity, which has a bulk density lower than 1.0 g/cm.sup.3 and a recovery ratio of at least 50% at a compressibility of 5 to 50%.
Furthermore, in accordance with the present invention, there is provided a process for the preparation of a carbonaceous molded body composed of a carbonaceous or graphitic material, which comprises mixing elastic graphite particles with a binder, molding the mixture and subjecting the molded body to a firing treatment (heat-treatment) and/or a graphitizing treatment to obtain a carbonaceous molded body having a light weight and an excellent elasticity, which is composed of a carbonaceous or graphitic material and has a bulk density lower than 1.0 g/cm.sup.3 and a recovery ratio of at least 50% at a compressibility of 5 to 50%.
BEST MODE FOR CARRYING OUT THE INVENTION
Known elastic graphite materials can be used as the sta
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Fujii Masaki
Minohata Masanori
Koa Oil Company Limited
Lieberman Paul
Swope Bradley A.
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