Patent ID: 7641945

Claim:
An electrical-discharge surface-treatment method for forming a coat on a surface of a workpiece using a pulse electrical discharge between an electrode and the workpiece, the method comprising: forming the coat with a material constituting the electrode or a substance that is generated by a reaction of the material due to the pulse electrical discharge, wherein: the electrode is a green compact electrode which is formed with a powder comprising a metallic powder or a metallic compound powder, the powder having an average grain diameter of 1 micrometer or less and containing a metallic material, the coat contains the metallic material as a result of the reaction generated under conditions of a width of a current pulse for the pulse electrical discharge in a range of 8 microseconds to 50 microseconds and a peak of the current pulse in a range of 2 amperes to 30 amperes, and the metallic material is as likely or less likely to be carbonized than at least one of Co, Fe, and Ni.