TA-NB ALLOY POWDER AND METHOD FOR PRODUCING SAME, AND ANODE ELEMENT FOR SOLID ELECTROLYTIC CAPACITOR

WIPO Patent Application WO/2019/198191

A1

The purpose of the preset invention is to provide: a Ta-Nb alloy powder for a solid electrolytic capacitor that has a high capacity and shows a small leak current even after undergoing a reflow processing; a method for producing the Ta-Nb alloy powder; and an anode element using the alloy powder. A Ta-Nb alloy powder produced by subjecting a Ta-Nb alloy powder, which is produced by a thermal CVD method, contains Nb in an amount of 10 to 80 mass% and has a primary particle diameter of 30 to 200 nm, to an oxidation treatment so as to concentrate the O content relative to the total amount of the particles in a zone surrounded by a point (Nb: 10%, O: 4.5%), a point (Nb: 20%, O: 5.5%), a point (Nb: 40%, O: 7.3%), a point (Nb: 60%, O: 7.5%), a point (Nb: 80%, O: 7.5%), a point (Nb: 80%, O: 6.5%), a point (Nb: 60%, O: 6.0%), a point (Nb: 40%, O: 4.8%), a point (Nb: 20%, O: 3.5%) and a point (Nb: 10%, O: 3.0%), all in mass%, in the relationship with the Nb content. In the Ta-Nb alloy powder, an oxide coating film layer composed of only an amorphous material is provided on the surface of each of the primary particles.

SATOH ISSEI (JP)
MAESHIMA TAKAYUKI (JP)

PCT/JP2018/015321

October 17, 2019

April 12, 2018

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ISHIHARA CHEMICAL CO LTD (JP)

B22F1/00; B22F1/16; H01G9/052

WO2016038711A1	2016-03-17
WO2014199480A1	2014-12-18

JP2002544375A

2002-12-24

KREHL, M. ET AL.: "SINTERING OF PREALLOYED Nb-Ta POWDERS FOR USE IN ELECTROLYTIC CAPACITORS", MOD DEV POWDER METALL, vol. 17, 1985, pages 629 - 640

GINZA MARONIE P.C. (JP)

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