Preparation and characterization of porous and electrically conducting carbon-clay composites |
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| Authors: | Takaki Kanbara Takakazu Yamamoto Hiroyuki Ikawa Tomohiko Tagawa Hisao Imai |
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| Affiliation: | (1) Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 227 Yokohama, Japan;(2) Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152 Tokyo, Japan;(3) Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 227 Yokohama, Japan |
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| Abstract: | Porous and electrically conducting carbon-clay composites were prepared by firing mixtures of carbon powder (0 to 20 wt%) and clay minerals. They showed porosity of 50 to 65% and had high mechanical strength (compressive strength = 130 to 400 kg cm–2) as well as high resistance against thermal oxidation in air. Their electrical conductivity,  , increased with increasing carbon content levelling off at about 20 wt% of carbon content to give a value of about 2 S cm–1. Formation of carbon chains is considered to be responsible for the electrical conduction in the composite, and a model to correlate the electrical conductivity with the carbon content has been proposed by modifying a model previously proposed by Scarisbrick. |
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