Dowa Mining Co., Ltd.

Japan Aviation Electronics Industry, Limited

Tohoku University

Dowa Electronics Materials Co., Ltd.

Kazuhisa Saito

Kazushi Sano

Seiichi Hisano

Yoshichika Horikawa

Yasuhiko Aihara

Shinichi Konno

Kazuyuki Matsumoto

Hiroshi Akimoto

Kenji Murata

Satoshi Aizawa

Asuka Hosoda

Kenichi Inoue

Akira Nagatomi

Koji Tanoue

Atsushi Muramatsu

Kiyoshi Kanie

Akito Inoue

Akio Sawabe

A production method capable of producing ITO particles without using a solvent with a high boiling point as a solvent used in the producing step by a simple treatment method without through a heating process in an atmosphere which disadvantageously causes sintering among the ITO particles to coarsen the ITO particles. An ITO powder suitable for a coating material for a transparent electroconductive material, being produced by a first step of dissolving salt containing indium and salt containing tin into an organic solvent, then adding to this organic solvent, an organic solvent containing a basic precipitant, to thereby manufacture a mixture of a precursor containing indium and tin, and the organic solvent; and a second step of applying heat treatment to the mixture of the precursor containing indium and tin, and the organic solvent in a pressurizing vessel at 200&#xb0; C. or more and 300&#xb0; C. or less, to generate ITO particles.

Method of producing ITO particles

A method of manufacturing an electronic component with a contact having a terminal section for brazing and a contact section includes steps that construct a contact base member of a material that is poorly wettable, forms a primer plating layer of a material that is poorly wettable to the weld brazing material on the base member, forms a finish plating layer of a material that is highly wettable to the weld brazing material on the primer plating layer, and selectively removes a portion of the finish plating layer to obtain an exposed region of the primer plating layer that serves as an arresting region for arresting the weld brazing material from creeping up and migrating along the highly wettable finish plating layer in brazing the terminal section to the brazing pad of a wiring board.

Method for manufacturing an electronic component

An electronic component is obtained by forming a primer plating layer of a material which is poorly wettable to a weld brazing material on a base member X of a contact having a terminal section for brazing and a contact section , and then forming a finish plating layer of a material which is highly wettable to the weld brazing material on the primer plating layer. An exposed region of the poorly wettable primer plating layer is formed thereafter by selectively removing a portion of the finish plating layer at the terminal section and served as an arresting region for arresting the weld brazing material from creeping up and migrating along the highly wettable plating layer in brazing the terminal section to the brazing pad of a wiring board

Electronic component and a method of manufacturing the same

A ferromagnetic powder containing iron as the principal component and containing more than 5 to 50 at. % Co, 0.1 to 30 at. % Al, 0.1 to 10 at. % of a rare earth element inclusive of Y, 0.05% by weight or less of an element belonging to Group 1 of the Periodic Table, and 0.1% by weight or less (inclusive of 0% by weight) of an element belonging to Group 2 of the Periodic Table, the powder comprising flat acicular particles having a mean major axis length of 0.01 to 0.40 &mgr;m and a crystallite diameter as determined by X-ray diffraction (Dx) of 50 to 250 angstrom, provided that the cross section diameter in the minor axis direction cut perpendicular to the major axis has a larger width and a smaller width, and that this cross section ratio in the minor axis direction, which is a larger width to smaller width ratio, uniformly yields a value of greater than 1, preferably 1.5 or higher, and the powder yielding a &sgr; /Dx ratio of 0.7 or higher, wherein, &sgr; represents the saturation magnetization and Dx represents the crystallite size determined by X-ray diffraction.

Ferromagnetic powder

A powder for use in the lower layer of a coating magnetic recording medium, comprising acicular particles with a mean major axis length in a range of from 0.01 to 0.5 &mgr;m and a mean minor axis length in a range of from 0.01 to 0.05 &mgr;m, provided that the acicular particles are flat acicular particles which, when cut in a direction perpendicular to the major axis, uniformly exhibit a cross section having a larger width to smaller width ratio of greater than 1, and that the quantity of discharged H O at 100&deg; C. is in a range of from 0.1 to 2.0% by weight.

Powder for use in lower layer of coating type magnetic recording medium

Iron oxyhydroxide particles that are composed of acicular particles having an average major axis of 0.01 to 0.5 &mgr;m and containing not less than 0.1 wt. % and not more than 30 wt. % of Al in the iron oxyhydroxide and that release not less than 0.1 wt. % and not more than 2 wt. % of H,O at 100&deg; C. are used as particles of a lower layer of a coating type magnetic recording medium having a multi-layer structure. The acicular particles include ones having two or more branches whose branching direction is skewed toward a two-dimensional orientation.

Particle for lower layer of coating type magnetic recording medium

Particles for lower layer of coating type magnetic recording medium

A coating type magnetic recording medium having a multilayer structure exhibits excellent strength, surface smoothness, and weather resistance is formed on a substrate, and comprises a magnetic layer of magnetic particles dispersed in a resinous binder, and a non-magnetic layer of non-magnetic particles dispersed in a resinous binder. The magnetic particles are composed of acicular ferromagnetic metal particles of Fe containing Co, Al, rare earth elements, periodic table group 1a and 2a elements. The non-magnetic particles are composed of acicular particles of .alpha.-FeOOH.

Coating type magnetic recording medium having a multilayer structure

There is provided an accicular ferromagnetic metal powder with which one can produce magnetic media for high-density recording that are improved in storage stability and magnetic characteristics. The improved ferromagnetic metal powder essentially consists of iron and 50 atm % based on the amount of iron of cobalt and at least one of aluminum and yttrium or any other rare earth element and contains no more than 0.05 wt % of an element of Group Ia of the periodic table (Li, Na, K). The amount of aluminum is in the range of 0.1-30 atm %, the amount of yttrium or any other rare earth element is in the range of and 0.1-10 atm %, each being based on the total quantity of the metal elements present. In either of these cases, the residue of an element of Group IIa of the periodic table (Mg, Ca, Sr, Ba) is preferably 0.1 wt % or less.

Ferromagnetic metal powder

There is provided a metallic magnetic powder with which one can produce magnetic media for high-density recording that are improved in storage stability and magnetic characteristics. The improved ferromagnetic metal powder contains no more than 0.05 wt % of an element of Group Ia of the periodic table. The powder may optionally contain 0.1-30 atm % of aluminum and/or 0.1-10 atm % of Y or any other rare earth element based on the total quantity of the metal elements present. In either of these cases, the residue of an element of Group IIa of the periodic table is preferably 0.1 wt % or less.

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Tokyo, Japan

Kazuhisa Saito