Tanaka Kikinzoku Kogyo K.k.

Mabuchi Motor Co., Ltd.

Tohoku University

Tanaka Holdings Co., Ltd

Other

Toshiya Yamamoto

Keiji Nakamura

Takao Asada

Takanobu Miyashita

Osamu Sakaguchi

Masahiro Takahashi

Shin Saito

Isao Shibuya

Tetsuya Nakamura

Kim Kong Tham

Shintaro Hinata

Yasuyuki Goto

Ryousuke Kushibiki

Shuichi Kubota

Yasuhiro Hashimoto

Kiyokazu Kojima

Kiyoshi Higuchi

Kengo Taneichi

Osamu Itoh

Migaku Takahashi

Kunihiro Shima

Kenji Shiraki

Hiroyuki Kusamori

Osamu Matsuzawa

Makoto Takabatake

Kiyoshi Nakama

Kazuyasu Takada

Takemasa Honma

Provided is a sputtering target with which it is possible to form a magnetic thin film having a high coercive force Hc. The sputtering target is a sputtering target that contains metallic Co, metallic Pt, and an oxide, wherein the sputtering target contains no metallic Cr except inevitable impurities, the oxide has BO, and the sputtering target comprises 10 to 50 vol % of the oxide.

Sputtering target

A sputtering target for magnetic recording media capable of producing a magnetic thin film in which the magnetic crystal grains are micronized and the distance between the centers of the grains is reduced while good magnetic properties are maintained. The target including metallic Pt and an oxide, with the balance being metallic Co and inevitable impurities, wherein the Co is contained in a range of 70 at % to 90 at % and the Pt is contained in a range of 10 at % to 30 at % relative to a total of metallic components in the sputtering target for magnetic recording media, the oxide is contained in a range of 26 vol % to 40 vol % relative to a total volume of the sputtering target for magnetic recording media, and the oxide is composed of BOand one or more high-melting-point oxides having a melting point of 1470&#xb0; C. or higher and 2800&#xb0; C. or lower.

Sputtering target for magnetic recording media

Provided is a sputtering target with which it is possible to form a magnetic thin film having a high coercive force Hc and a process for production thereof. The sputtering target is a sputtering target comprising metallic Co, metallic Pt, and an oxide, wherein the sputtering target does not contain metallic Cr, and the oxide is WOand wherein the sputtering target comprises 25 to 50 at % of metallic Co relative to a total of metallic Co and metallic Pt.

Sputtering target and process for production thereof

A sintering method with uniaxial pressing includes: a powder filling step of disposing a spent target in an inner space of a frame jig having the inner space piercing in a uniaxial direction, and filling the inner space with a raw material powder for a target to cover an erosion part side of the spent target with the raw material powder for a target, a cushioning-material disposition step of disposing a deformable cushioning material so that the raw material powder for a target with which the inner space has been filled in the powder filling step is sandwiched between the spent target and the deformable cushioning material; and a sintering step of pressing the raw material powder for a target with which the inner space has been filled and the spent target in the uniaxial direction through the cushioning material and sintering them.

Method for producing regenerated target

A method for manufacturing an electric contact material in which a surface layer portion of an alloy containing 1 to 15 mass % of Cu, 0.01 to 0.7 mass % of Ni, and the remainder of Ag and unavoidable impurities is supplied with an amount of oxygen exceeding the amount of oxygen required for internal oxidation of Cu to form an oxygen concentrated layer.

Method for manufacturing electric contact material, electric contact material, and thermal fuse

A target consisting essentially of a CoCrPt-based metal or a CoCrPtRu-based metal, and one or more metal oxides selected from the group consisting of SiO, CrO, CoO, TiOand TaO, is heated in an upper crucible of a two-level crucible that includes the upper crucible with a through hole formed in a bottom surface, and a lower crucible disposed below the through hole. The target is heated at a temperature of from 1400 to 1790&#xb0; C. if the target does not contain both TiOand TaO. The target is heated at a temperature of from 1400 to 1630&#xb0; C. if the target contains TiObut does not contain TaO. The target is heated at a temperature of from 1400 to 1460&#xb0; C. if the target contains TaO. The metal thereby melted is caused to flow into the lower crucible, so that the metal is separated from the metal oxide.

Method for recovering metal from target and method for manufacturing target

In the method for recovering a metal from a target that contains a metal and a metal oxide, the target contains a sintered body of the metal oxide after being heated under a condition of melting the metal without melting or decomposing the metal oxide. The target is heated in an upper crucible of a two-level crucible that includes the upper crucible with a through hole-formed in a bottom surface thereof, and a lower crucible disposed below the through hole, the size of the through hole being set such that it does not allow the sintered body of the metal oxide contained in the target to pass therethrough, and the melted metal is caused to flow into the lower crucible, so that the metal is separated from the metal oxide.

An object of the present invention is to provide a commutator or brush material for a small electric DC motor which enables a lengthened operating life of a spindle motor for a DVD controlled using a pulse current. A commutator material for a small electric DC motor in accordance with the present invention is characterized by being composed of 6.0 to 10.0 wt % of Cu, 1.0 to 5.0 wt % of ZnO, and a balance of Ag and in that Cu metal particles and ZnO particles are dispersed in an AgCu matrix. A brush material for a small electric DC motor in accordance with the present invention is characterized by being composed of 0.1 to 5.0 wt % of MgO and a balance of Ag and in that MgO particles are dispersed in an Ag matrix, or is characterized by being composed of 5.0 to 15.0 wt % of Ni and a balance of Pt and in that Ni is dissolved in a Pt matrix.

Commutator and brush materials for small electric motor, clad composite material, and small electric DC motor using the same

The invention provides a material for sliding contacts that is suitable for a small-sized DC motor used in recent downsized CD players and is excellent in durability. A material for sliding contacts used in a commutator of a small-sized DC motor that consists essentially of 0.01 to 3.0% Ni by weight, 0.01 to 6.0% ZnO by weight and/or 0.01 to 3.0% MgO by weight, furthermore, in some cases, 0.01 to 5.0% Cu by weight, and the balance Ag, in which Ni metal particles, ZnO particles or MgO particles are dispersed in the matrix of Ag.

Material for sliding contacts, clad composite material and small-sized DC motor using the same

The invention is directed to an electric contact material useful in the fabrication of a vehicle relay of high durability against inductive load to which the relay incorporated in a magnetic clutch of a vehicle air-conditioner is exposed, and also to a relay having remarkable durability as has never been attained for use in vehicles. The invention provides an electric contact material useful in the fabrication of a relay for use in a vehicle, wherein the material contains an Ag&mdash;SnO &mdash;In O alloy which is produced through internal oxidation of an Ag&mdash;Sn&mdash;In&mdash;Ni alloy containing 5.0-10 wt. % (as reduced to metal) Sn and 2.0-5.0 wt. % In, the balance being Ag &lcub;or alternatively, an Ag&mdash;SnO &mdash;In O &mdash;NiO alloy which is produced through internal oxidation of an Ag&mdash;Sn&mdash;In&mdash;Ni alloy containing 5.0-10 wt. % (as reduced to metal) Sn, 2.0-5.0 wt. % In, and 0.01-0.50 wt. % Ni, the balance being Ag&rcub;, and is used in a shielded space.

Shielded-type automotive relay controlling a magnet clutch load of a vehicle air-conditioner

A make-and-break contact material which is less worn out and is able to achieve an increased life compared to a conventional material of Ag&mdash;CdO-based alloy, in an AC general relay used for a resistive load of about 1 to 20A in a range of AC 100V to 250V. In the present invention, the make-and-break contact material of Ag&mdash;Ni-based alloy used for a switching part performing electrical switching through mechanical switching operation is the make-and-break contact material of Ag&mdash;Ni-based alloy with Ni metal particles dispersed therein which is obtained through mixing and stirring 3.1 to 20.0 wt % of Ni powder, a certain amount of Li CO powder corresponding to 0.01 to 0.50 wt % of metal Li as an additive, and a balance being Ag powder to make a mixture with the above described powders uniformly dispersed therein, and through compacting and sintering the above described mixture.

Make break contact material comprising ag-ni based alloy having ni metal particles dispersed and relay using the same

The present invention is aimed at providing a sliding contact material that has an alloy composition containing no harmful substance like Cd, especially excellent contact resistance properties, electrical functions that are good and is not subject to secular change, and abrasion resistance practically bearing comparison with conventional sliding contact materials, and is aimed at lengthening the life of a motor by the use of a sliding contact material having excellent durability as a commutator for a small direct-current motor. The present invention is a sliding contact material of an Ag&mdash;Ni-based alloy that is used in sliding part electrically switching on and off by mechanical sliding action, and the material is a sliding contact material of Ni metal particle-dispersed-type Ag&mdash;Ni-based alloy that is produced in such a method that 0.7 to 3.0 wt. % Ni powder, an additive of Li CO powder corresponding to 0.01 to 0.50 wt. % Li after being converted to metal and the balance of Ag powder are mixed and stirred to form a uniformly dispersed mixture, then the mixture is treated with forming and sintering processes.

Sliding contact material comprising Ag-Ni based alloy having Ni metal particles dispersed and clad composite material, and Dc compact motor using the same

An object of the present invention is to provide a method of producing an Ag&mdash;ZnO electric contact material which can uniformly disperse ZnO micrograms in Ag; which maintains low contact resistance; which exhibits enhanced welding resistance and wear resistance; and which is suitable in view of production costs. The method of producing an Ag&mdash;ZnO electrical contact material comprises casting Ag and Zn at predetermined proportions and subjecting the resultant Ag&mdash;ZnO alloy to internal oxidation so as to disperse ZnO in Ag, the method being characterized in that an Ag&mdash;Zn alloy comprising 5-10 wt. % (as reduced to weight of metal) Zn, the balance being Ag, is formed into chips; the chips are subjected to internal oxidation; the internally oxidized chips are compacted to thereby form billets; the billets are pressed and sintered; and subsequently, the sintered billets are extruded, to thereby yield uniform dispersion, in Ag, of ZnO micrograms.

Method for preparing Ag-ZnO electric contact material and electric contact material produced thereby

An object of the present invention is to provide a material for a sliding contact whose alloy composition does not contain an environmentally detrimental substance such as Cd, which exhibits excellent contact resistance, whose electrical functions are good and free of time-course variation, and which further exhibits excellent wear resistance. The material for a sliding contact assumes the form of an Ag&mdash;Zn&mdash;Pd, Ag&mdash;Zn&mdash;Pd&mdash;Cu, Ag&mdash;Zn&mdash;Pd&mdash;Ni, or Ag&mdash;Zn&mdash;Pd&mdash;Cu&mdash;Ni alloy. In the compositions of these alloys, the Zn content is 0.1-3.0% by weight, the Pd content is 0.1-1.5% by weight, and the balance is Ag. When Cu is contained, the Cu content is 0.1-3.0% by weight. When Ni is contained, the Ni content is 0.01-0.5% by weight. Zn, Pd, and Cu are present in the Ag &agr; phase in the form of solid solution. Ni particles are finely dispersed in the alloys. A composite clad material is formed through use of the material for a sliding contact. A commutator manufactured through use of the composite clad material is incorporated into a small-sized direct current motor used in a household electrical appliance.

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Tsukuba, Japan

Toshiya Yamamoto