US 10,121,597 B2 · Tantalum wire used for anode lead of tantalum capacitor and manufacturing method thereof

Abstract

The present invention relates to a tantalum wire for anode lead of tantalum capacitors, characterized in that the cross section of the tantalum wire is approximate rectangular or regular rectangular. The present invention also relates to a process for manufacturing the tantalum wire, comprising the steps of: providing feedstock tantalum wire; subjecting the feedstock tantalum wire to heat treatment; subjecting the heat treated tantalum wire to surface pretreatment to form an oxide membrane on the surface-pretreated tantalum wire; rolling the surface-pretreated tantalum wire by lubricating with lubricant oil to make the cross section of the rolled tantalum wire being approximate rectangular or regular rectangular; subjecting the tantalum wire to final annealing.

Claims17

Dependent claims

A process for manufacturing a tantalum wire, comprising the steps of:

subjecting a feedstock tantalum wire to a heat treatment to form a heat-treated tantalum wire;
subjecting the heat-treated tantalum wire to a surface pretreatment to form an oxide membrane on the heat-treated tantalum wire to form a surface-pretreated tantalum wire;
rolling the surface-pretreated tantalum wire that is coated with the oxide membrane while lubricating with a lubricant oil to form a rolled tantalum wire with a cross section of the rolled tantalum wire being rectangular with curved corners;
and
annealing the rolled tantalum wire, wherein
the surface pretreatment is performed at a temperature of 500-700° C. in 99% pure oxygen atmosphere for 1 minute to 1 hour.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/882,249Filed 13 Oct 2015 · division

Priority

CN 2009 1 000089420 Jan 2009

Published

US 2016/0035494 A14 Feb 2016

Granted

6 Nov 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

H01G 9/0029
Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their…
B21B 1/18
For rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section: in a continuous process
B22F 3/24
Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted…:…
B22F 5/12
Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product: of wires

Family

PCT/CN2009/000556Parent of this division · filed 21 May 2009

US 2016/0035494 A1Pre-grant publication · published 4 Feb 2016

Application13/145,209Parent of this division

US 2012/0300362 A1Published application

US 10,121,597 B2This patent

From the US filing history. Foreign family members aren’t listed.

Tantalum wire used for anode lead of tantalum capacitor and manufacturing method thereof

Life of this patent

Tantalum wire used for anode lead of tantalum capacitor and manufacturing method thereof

Life of this patent

Abstract

Claims17