Toyo Tanso Co., Ltd.

Motoki Onishi

Naoto Ohta

Masaki Okada

Kiyoshi Saito

Takeyuki Namiki

Masao Kanda

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.

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Osaka, Japan

Motoki Onishi