Abstract: An electric double layer capacitor excellent in cycle characteristic with which a high electrostatic capacity is obtained by impression of a low voltage is provided. Carbonization treatment is carried out in which 1 kg of meso carbon micro beads whose particle diameter is 25 ?m is heated in a nitrogen atmosphere at 800° C. for 2 hours, and is cooled to room temperature. The carbide of meso carbon micro beads and sodium hydroxide powder are mixed in a ratio by weight of 1:2.5. Alkali activation treatment is carried out in which the mixture is heated in a helium atmosphere at 600° C. for 1 hour, and the carbide is exposed to sodium vapor. After cooling to room temperature, 8 g of this carbon powder, 1 g of ketchen black 1 g and 1 g of polytetrafluoroethylene are kneaded and rolled into a sheet 0.5 mm thick. The sheet-like carbon material is stamped out 16 mm in diameter to be active carbon layers 3 which form polarizable electrodes 4 in combination with collecting layers 2.

Abstract: A calcined two-layer carbon material is prepared characterized in that edge parts of a core carbon material are particularly or entirely coated with a coat-forming carbon material and that the carbon material is nearly spherical or ellipsoidal, wherein the carbon material has a specific surface area determined by a BET method of 5 m2/g or less.

Abstract: A slurry containing a precursor fiber convertible to carbon fiber and/or a carbon fiber and, based on 100 parts by weight of the fiber, 10 to 300 parts by weight of a thermosetting resin, e.g. phenol resin, is processed into a random web. This web may contain a pitch or an organic granular material. The web is hot-pressed between a pair of belts while curing of the resin is inhibited to prepare a prepreg sheet. This sheet is disposed, leaving a clearance, in a mold having ribs on a molding surface and heated over the melting point of the resin for expansion and complete cure to provide a porous composite sheet equipped with grooves. This porous composite sheet is carbonized or graphitized to produce a porous carbonaceous material for use as a fuel cell electrode material and so on. This porous carbonaceous material has high homogeneity, gas permeability, electrical conductivity, heat conductivity and mechanical strength.

Abstract: A zinc anode can is formed of a zinc based alloy material including 0.004-0.800 wt % of indium, 0.001-0.25 wt % of titanium or 0.002-0.500 wt % of zirconium, without containing significant amounts of harmful substances such as mercury, cadmium, or lead, is provided. A method of manufacturing of such zinc anode can enabling addition of up to 0.800 wt % of indium includes hot rolling of the zinc base alloy in a temperature range of 270-370.degree. C. A manganese dry battery includes a separator on which is coated a paste having 0.1-8 wt % of InCl.sub.3. The separator is disposed on the inner surface of the zinc can. An interior of the separator is filled with a cathode mixture containing conductive carbonaceous material such as manganese dioxide, and acetylene black and electrolyte with a ZnCl.sub.2 concentration of 35-50 wt %. A carbon rod as a collector is inserted into the center of the cathode mixture.

Abstract: A sintered product based on mesocarbon microbeads is prepared by pressure-molding mesocarbon microbeads (MCMB) having an MSP (maximum solubility percent) value of 30 to 38% by volume whereby a body is formed, and sintering the body, wherein MSP represents the percentage volume reduction (volume %) determined by heating a given amount of an MCMB to 350.degree. C. under a pressure load of 10 kgf/cm.sup.2. The quality of a molded MCMB sintered product can be controlled by determining the percentage volume reduction (MSP) of an MCMB by heating it under a given pressure load in a predetermined space using the MSP value so found as an indicator.

Abstract: A carbon fiber reinforced carbon of the present invention is composed of a sintered body comprising precursor carbonaceous fiber and self-sintering carbonaceous powder with the precursor carbonaceous fiber buried therein. Since the precursor carbonaceous fiber working as a reinforcement and the self-sintering carbonaceous powder working as a binder come to have substantially the same physical properties (strength, shrinkage rate and the like), the boudary adhesion between them improves, thereby giving the sintered body high strength and excellent abrasion resistance. When the precursor carbonaceous fiber is subjected to a surface treatment using a viscous material, the wettability of the surface of the precursor carbonaceous fiber increases, thereby further improving the boundary adhesion between the precursor carbonaceous fiber and the self-sintering precursor carbonaceous powder.

Abstract: Disclosed is a sliding member having a predetermined shape and including: a sintered body obtained by sintering a composite body including: preliminary carbonized carbonaceous fiber; inorganic powder or inorganic fiber; and self-sintering carbonaceous powder with the preliminarily carbonized carbonaceous fiber and the inorganic powder or the inorganic fiber buried therein. The sliding member has a high and stable friction coefficient (.mu.), high strength, excellent abrasion resistance, and is manufacturable at a low cost. Further, the friction coefficient (.mu.) and the other properties of the sliding member can be controlled depending on an application of a sliding member by selecting an optimum inorganic powder or inorganic fiber. Particularly, when boron compound powder is selected as the inorganic powder, the friction coefficient (.mu.) of the sliding member can be suppressed to 0.15 or less, and the load at seizure thereof can be improved to 100 kgf/cm.sup.2 or more.

Abstract: Pitch substantially free from primary and secondary QI components and solids comprising secondary QI components are prepared by centrifuging coal tar or coal tar pitch at a high temperature, heat-treating the separated supernatant liquid and centrifuging again the liquid at a high temperature.