Toyo Tanso Co., Ltd.

Doryokuro Kakunenryo Kaihatsu Jigyodan

Masaki Okada

Naoto Ohta

Takahiro Morishita

Tadashi Maruyama

Kiyoshi Saito

Hironori Orikasa

Makoto Tatsumi

Masao Kanda

Motoki Onishi

Katuhide Nagaoka

Takeyuki Namiki

A porous carbon that has an extremely high specific surface area while being crystalline, and a method of manufacturing the porous carbon are provided. A porous carbon has mesoporesand a carbonaceous wallconstituting an outer wall of the mesopores, wherein the carbonaceous wallhas a portion forming a layered structure. The porous carbon is fabricated by mixing a polyamic acid resinas a carbon precursor with magnesium oxide 2 as template particles; heat-treating the mixture in a nitrogen atmosphere at 1000&#xb0; C. for 1 hour to cause the polyamic acid resin to undergo heat decomposition; washing the resultant sample with a sulfuric acid solution at a concentration of 1 mol/L to dissolve MgO away; and heat-treating the noncrystalline porous carbon in a nitrogen atmosphere at 2500&#xb0; C.

Porous carbon and method of manufacturing same

An object is to provide a graphite-copper composite electrode material that is capable of reducing electrode wear to a practically usable level and to provide an electrical discharge machining electrode using the material. A graphite-copper composite electrode material includes a substrate comprising a graphite material and having pores, and copper impregnated in the pores of the substrate, the electrode material having an electrical resistivity of 2.5 &#x3bc;&#x3a9;m or less, preferably 1.5 &#x3bc;&#x3a9;m or less, more preferably 1.0 &#x3bc;&#x3a9;m or less. It is desirable that the substrate comprising the graphite material have an anisotropy ratio of 1.2 or less. It is desirable that an impregnation rate &#x3c6; of the copper in the electrode material is 13% or greater. It is desirable that the substrate comprising the graphite material have a bulk density of from 1.40 Mg/mto 1.85 Mg/m.

Graphite-copper composite electrode material and electrical discharge machining electrode using the material

A function ally gradient composite material containing copper and carbon as main components and having a predetermined shape, in which the composition ratio of the copper to the carbon in the material continuously varies in at least one predetermined direction. The material is manufactured, for example, by impregnating carbon felt with a resin and thermo-compressively molding the impregnated felt (step S101), carbonizing the resin by baking (step S102) to provide a preformed carbon material (step S104). Pyrolytic carbon is thereafter deposited in the preformed carbon material by the CVI method (step S105) to provide a carbon material having the bulk density varying in a predetermined direction (step S107). After the wettability of the carbon material against copper is improved by siliconization (step S108), pores of the carbon material are impregnated with copper (step S109) to obtain a functionally gradient composite material of copper and carbon.

Copper-carbon composite material with graded function and method for

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Kanonji, Japan

Masaki Okada