Kawasaki Steel Corporation

Kawatetsu Mining Co., Ltd.

Kensuke Matsuki

Masao Yukumoto

Fumio Kogiku

Nobuo Shiga

Seiji Okabe

Hitoshi Ogo

A copper alloy powder for an electrically conductive paste is provided, which is characterized in that the copper alloy powder comprises 80 to 99.9 mass % of Cu and 0.1 to 20 mass % of one or two elements selected from the group consisting of Ta and W and has an average particle size of 0.1 to 1 &#x3bc;m. This copper alloy powder has a higher starting temperature for sintering, higher oxidation resistance and better heat resistance than a copper powder.

Copper alloy powder for electrically conductive paste

A Ni&#x2014;Fe based alloy powder of the present invention contains not less than 90% by a combined mass of Ni and Fe and homogeneously has particles having an average particle diameter from 0.1 to 1 &#x3bc;m, and an average value of mass ratio Fe/(Fe+Ni) from 15% to 25% both inclusive, wherein the ratio of a maximum value X and a minimum value Y of Fe/(Fe+Ni), which are found at individual points in the region ranging from the center of any particle of the alloy powder to locations apart by 0.9 fold of the particle radius therefrom, X/Y is from 1 to 2. By producing a sintered part using this Ni&#x2014;Fe based alloy powder as a raw material powder, it is possible to obtain electronic circuit parts which are homogenous and have high magnetic permeability.

Ni-Fe based alloy powder

An amorphous alloy having a boron content of about 6 to 10 at %, cast into a plate, wherein the plate thickness is about 15 to 25 &mgr;m, and the surface roughness Ra,of the plate is about 0.8 &mgr;m or less.

Low boron amorphous alloy and process for producing same

A wide amorphous alloy thin strip having a width of 70 mm or above and useful as an iron core of electric power transformers, composed of Fe--Si--B--C amorphous alloy. Dispersion of an amorphous structure in the width direction is prevented and deterioration of the strip properties is suppressed by adding Mn or by casting in an atmosphere containing a carbonic acid gas in an amount of about 40 vol % or more to thereby control strip surface roughness to a center line average surface roughness of about 0.7 .mu.m or less.

Wide iron-based amorphous alloy thin strip, and method of making the same

A method and apparatus for manufacturing an amorphous metal ribbon provides the following: jetting a molten metal from a nozzle, which has a slit-shaped opening, to a cooling roll, which rotates at a high speed, so as to form a puddle on the cooling roll; and spreading the puddle for rapid solidification. Additionally, the present invention provides at a position upstream from the puddle in a direction opposite the direction of rotation of the cooling roll, cleaning the surface of the cooling roll by blowing carbon dioxide gas to which ultrasonic vibration is applied.

Method and apparatus for manufacturing amorphous metal ribbon

An iron-based amorphous alloy thin strip for wound transformers has a composition expressed by a chemical formula:

Iron-based amorphous alloy thin strip and transformers made therefrom

A low boron amorphous alloy having excellent soft magnetic characteristics, composed of B: about 6-10 at %, Si: about 10-17 at %, P: about 0.02-2 at % and the balance Fe and incidental impurities. The invention lowers production costs because the content of expensive boron is reduced.

Growing community of inventors

Chiba, Japan

Kensuke Matsuki