| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method using electric discharge for the purpose of forming a coating film free from a crack. SOLUTION: The surface treatment method using electric discharge is directed for generating a pulse-shaped electric discharge in a working liquid or a gas between a workpiece and an electrode which is prepared from a metal powder or a powder of a compound of a metal, a green powder-compact formed by molding a ceramic powder, a heat-treated powder-compact of the green compact, or a metal, while keeping a gap between them by using a servo mechanism so that the electrode and the workpiece do not come in contact with each other; and forming a coating film made from an electrode material or a reacted substance of the electrode material by the electric discharge energy, on the surface of the workpiece. The surface treatment method includes forming a mottled coating film on the surface to be film-formed of the workpiece on an electrode-projected plane, in which an exposed portion of a base material, at which the surface of the base material of the workpiece is exposed, and an electrode-material coating film portion formed from a material which has been supplied from the electrode coexist. The surface of the coating film thus formed on the surface of the workpiece has no crack formed by heat due to the electric discharge. COPYRIGHT: (C)2010,JPO&INPIT
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