Abstract: A slidable component including a wear-resistant coating includes a slidable component, and a wear-resistant coating provided on a slide surface of the slidable component. The wear-resistant coating includes metal particles deposited on the side surface of the slidable component, and containing Ni, Co and Cr, and a first oxide layer covering surfaces of the metal particles, containing an Al oxide as its main component, and containing a Y oxide.

Abstract: A sliding part with a wear resistant coating includes a sliding part, and a wear resistant coating provided on a sliding surface of the sliding part, and made of a cobalt alloy containing chromium and silicon. In the wear resistant coating, oxide particles are dispersed which include an oxide containing chromium and silicon, and have a particle size of 100 ?m or less when a cross section of the wear resistant coating is observed using an optical microscope with a magnification of 100 times.

Abstract: A slidable component including a wear-resistant coating includes a slidable component, and a wear-resistant coating provided on a slide surface of the slidable component. The wear-resistant coating includes metal particles deposited on the side surface of the slidable component, and containing Ni, Co and Cr, and a first oxide layer covering surfaces of the metal particles, containing an Al oxide as its main component, and containing a Y oxide.

Abstract: A sliding part with a wear resistant coating includes a sliding part, and a wear resistant coating provided on a sliding surface of the sliding part, and made of a cobalt alloy containing chromium and silicon. In the wear resistant coating, oxide particles are dispersed which include an oxide containing chromium and silicon, and have a particle size of 100 ?m or less when a cross section of the wear resistant coating is observed using an optical microscope with a magnification of 100 times.

Abstract: Employing a compact molded from powder of metal or the like as an electrode 11, generating pulsed discharges between the electrode 11 and a treating portion Wa of work W in working oil L as a mixture with powder of semiconductor or conductor mixed therein, using discharge energy thereof for locally fusing surface regions of the treating portion Wa of work W, showering molten pieces of electrode material or reactants of the electrode material onto the treating portion Wa of work W, forming a covering film C on the treating portion Wa of work W.

Abstract: A discharge surface treatment electrode used in discharge surface treatment for forming a wear-resistant film on a treatment target surface of a workpiece by use of the discharge energy of electric discharges caused between the electrode and the workpiece, the film being made of a material of an electrode or a substance obtained by a reaction of the material of the electrode with the discharge energy. The discharge surface treatment electrode is formed by: compression-molding a mixed powder into a green compact, the mixed powder being formed from a powder of a Stellite alloy with an average particle size of 3 ?m or less prepared by use of a jet mill and a powder of a metal with an average particle size of 3 ?m or less manufactured through an atomization process or a chemical process; and subjecting the green compact to heat treatment.

Abstract: A cutting instrument has a cutting blade portion formed with a skin made of an electrode material or a reaction product of the electrode material, the electrode material having been molten by pulse discharges induced between the cutting blade portion and an electrode in a machining liquid or gas, having as the electrode one of a mold molded from powder of a kind or powder of a mixture of kinds out of a metal or metals, a metal compound or metal compounds, and a ceramic or ceramics, and a heat-treated mold being the mold as heat-treated.

Abstract: Employing a compact molded from powder of metal or the like as an electrode 11, generating pulsed discharges between the electrode 11 and a treating portion Wa of work W in working oil L as a mixture with powder of semiconductor or conductor mixed therein, using discharge energy thereof for locally fusing surface regions of the treating portion Wa of work W, showering molten pieces of electrode material or reactants of the electrode material onto the treating portion Wa of work W, forming a covering film C on the treating portion Wa of work W.

Abstract: An electrode applicable to discharge surface treatment is produced. This method is comprised of: kneading a composition including an electrically conductive mixed matter including a first powder obtained by at least any process selected from the group consisting of an atomizing method, a reduction method, and a carbonyl method and a second powder obtained by a crushing method, and a binder, the electrically conductive mixed matter including the second powder at a ratio of 10-65 weight %; injecting the kneaded composition into a mold to produce a green body; heating the green body so as to remove the binder from the green body; and sintering the green body excepting the binder.

Abstract: A cutting edge structure for a cutting tool including: a base member having first and second surfaces intersecting each other; and a cutting edge member supported by the base member and having higher hardness than the base member. The cutting edge member includes a coating formed by generating electric discharge between the second surface and a discharge electrode and by depositing a constituent material of the discharge electrode or a reacted substance of the constituent material on the second surface, the discharge electrode being formed by molding powder of metal, powder of a metal compound, powder of a ceramic, or powder of a mixture thereof. An edge of the coating projects from a cross ridge line between the first and second surfaces toward a distal end side of a cutting edge. The cutting edge angle is 10° to 20° inclusive.

Abstract: Generating pulsed discharge between an end surface of an electrode and an end face portion of a metallic plate, to attrite the electrode, to form in the end surface of the electrode a recess conforming to a shape of the end face portion of the metallic plate, having the electrode making a relative movement in a direction perpendicular to a lateral side of the metallic plate, generating pulsed discharge between an internal side face of the electrode recess and a lateral face of the end face portion of the metallic plate, to form an auxiliary coat on the lateral face of the end face portion of the metallic plate, and generating pulsed discharge between a bottom face of the electrode recess and a top face of the end face portion of the metallic plate, to form a cladding layer on the end face portion of the metallic plate.

Abstract: An electrode used in combination with an electric spark machine for surface treatment, is comprised of a mixed powder including a powder of aluminum at a ratio of 5-18 weight % to the total of the mixed powder or a powder of any metal selected from the group consisting of nickel, cobalt, and iron at a ratio of 5-40 weight % to the total of the mixed powder and a powder of titanium hydride, wherein the mixed powder is formed by molding and sintering into a structure so dimensioned as to be incorporated in the electric spark machine as an electrode therefor.

Abstract: A method for closing a hole with a coating is provided. The method comprises attaching the subject body to an electric spark machine as a workpiece; bringing an electrode of a powder including an electrically conductive substance close to the subject body so as to lap the electrode over the hole; applying a voltage between the electrode and the subject body so as to generate electric discharge repetitiously to cause a coating closing the hole to grow from a periphery of the hole; and machining an edge of the hole before applying the voltage, or the coating along the edge of the hole during repetition of applying the voltage, to give a bevel.

Abstract: A discharge surface treatment electrode used in discharge surface treatment for forming a wear-resistant film on a treatment target surface of a workpiece by use of the discharge energy of electric discharges caused between the electrode and the workpiece, the film being made of a material of an electrode or a substance obtained by a reaction of the material of the electrode with the discharge energy. The discharge surface treatment electrode is formed by: compression-molding a mixed powder into a green compact, the mixed powder being formed from a powder of a Stellite alloy with an average particle size of 3 ?m or less prepared by use of a jet mill and a powder of a metal with an average particle size of 3 ?m or less manufactured through an atomization process or a chemical process; and subjecting the green compact to heat treatment.

Abstract: A surface treatment method of a subject body is comprised steps of: packing and pressurizing powder including an electrically conductive material in a mold so as to obtain a plurality of compressed powder bodies; joining the plurality of compressed powder bodies together by arranging the plurality of compressed powder bodies to be mutually in close contact and applying isostatic pressure on the arranged compressed powder bodies; sintering the joined compressed powder bodies so as to obtain a sintered body; and carrying out a discharge surface treatment by bringing the sintered body close to a subject body and generating electric discharge.

Abstract: A cutting instrument (1) has a cutting blade portion (13) formed with a skin (7) made of an electrode material or a reaction product of the electrode material, the electrode material having been molten by pulse discharges induced between the cutting blade portion (13) and an electrode in a machining liquid or gas, having as the electrode one of a mold molded from powder of a kind or powder of a mixture of kinds out of a metal or metals, a metal compound or metal compounds, and a ceramic or ceramics, and a heat-treated mold being the mold as heat-treated.

Abstract: Employing a compact molded from powder of metal or the like as an electrode 11, generating pulsed discharges between the electrode 11 and a treating portion Wa of work W in working oil L as a mixture with powder of semiconductor or conductor mixed therein, using discharge energy thereof for locally fusing surface regions of the treating portion Wa of work W, showering molten pieces of electrode material or reactants of the electrode material onto the treating portion Wa of work W, forming a covering film C on the treating portion Wa of work W.

Abstract: Generating pulsed discharge between an end surface of an electrode 37 and an end face portion of a metallic plate 11, to attrite the electrode 37, to form in the end surface of the electrode 37 a recess 41 conforming to a shape of the end face portion of the metallic plate 11, having the electrode 37 making a relative movement in a direction perpendicular to a lateral side of the metallic plate 11, generating pulsed discharge between an internal side face of the recess 41 of the electrode 37 and a lateral face 11bl (11cl) or 11br (11cr) of the end face portion of the metallic plate 11, to form an auxiliary coat 43 or 45 on the lateral face 11bl (11cl) or 11br (11cr) of the end face portion of the metallic plate 11, and generating pulsed discharge between a bottom face of the recess 41 of the electrode 37 and a top face 11bu (11cu) of the end face portion of the metallic plate 11, to form a cladding layer 47 on the end face portion of the metallic plate 11.