Patent ID: 8658005

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 formed by compression-molding and heating a powder comprising a metallic powder or a metallic compound powder, the electrode is formed by the powder and a base powder, each having an average grain diameter of 3 micrometers or less, the powder is 40% volume or more of a metallic material, the coat contains the metallic powder or the metallic compound powder as a result of the reaction generated under conditions of a width of a current pulse for the pulse electrical discharge less than or equal to 70 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.