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Tantalum Wire Used for Anode Lead of Tantalum Capacitor and Manufacturing Method Thereof

a technology of tantalum capacitors and anodes, which is applied in capacitor manufacture, electrolytic capacitor manufacturing, feed-through capacitors, etc., can solve the problems of excessive leakage current of tantalum capacitors, low contact strength, and decrement of the specific capacity of tantalum capacitors

Inactive Publication Date: 2012-11-29
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]As to one or more problems existing in the prior art, the present invention provides a special-shaped tantalum

Problems solved by technology

If the sintering temperature is too high, the porosity of tantalum powder is reduced largely, and thereby decreasing the specific capacity of tantalum capacitors.
However, if conventional circular anode lead is used on low-temperature sintered tantalum capacitors, the following problems will arise, the anode lead made with circular tantalum wire has small contact area with tantalum anode pellet due to its relative small surface area, thereby leading to low contact strength and excessive leakage current of tantalum capacitor, even leading to the shedding of the tantalum wire from the anode pellet which will result the failure of the tantalum capacitor.
With further development of miniaturization of tantalum capacitors, the problem of low pullout strength of lead wire of tantalum capacitors has more and more disadvantageous effect on the electronic properties and reliability of tantalum capacitors.
The reasons are as follows, none of the manufacturers can produce special-shaped tantalum wires whose chemical purity, surface finish, mechanical properties and electronic properties can meet the requirements of tantalum capacitors.
In many cases, it is the surface finish, mechanical properties and / or electronic properties cannot meet the strict requirements of tantalum capacitors.

Method used

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  • Tantalum Wire Used for Anode Lead of Tantalum Capacitor and Manufacturing Method Thereof
  • Tantalum Wire Used for Anode Lead of Tantalum Capacitor and Manufacturing Method Thereof

Examples

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example 1

[0041]Circular tantalum wire having a diameter of 0.97 mm was wound in a spool with the diameter of 300 mm, and placed into annealing furnace. The furnace was evacuated with vacuum pump. When the vacuum degree in the furnace reached to 5.0×10−2 Pa, the furnace was electrically heated to a temperature of 1380° C., hold for 60 minutes. After the heating was stopped, the furnace was naturally cooled. When the furnace was cooled to 180° C., in order to accelerate cooling and increase efficiency, inert gas such as argon could be introduced into the furnace.

[0042]The annealed circular tantalum wire was subjected to surface pretreatment in a muffle furnace. The annealed circular tantalum wire was placed in a muffle furnace. After 99% high purity oxygen was introduced into the furnace, the furnace was heated to 600° C. and hold for 10 minutes, so that the circular tantalum wire was subjected to surface pretreatment. The pretreated circular tantalum wire was straightened and wound on a tray....

example 2

[0046]Feedstock (circular tantalum wire) has the diameter of 0.78 mm, and three passes rolling was conducted. The rest steps were the same as described in Example 1. The dimension of each pass was changed as follows:

φ0.78−0.43×1.19−0.27×1.22−0.23×1.24

example 3

[0047]Feedstock (circular tantalum wire) has the diameter of 0.65 mm, and three passes rolling was conducted. The rest steps were the same as described in Example 1. The dimension of each pass was changed as follows:

φ0.65−0.37×1.09−0.20×1.11−0.15×1.12

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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.

Description

TECHNICAL FIELD[0001]The present invention relates to tantalum wire used for tantalum capacitor and manufacturing method thereof.BACKGROUND ART[0002]Tantalum capacitors have been widely used in fields of telecommunication, computer, automobile, household appliance, aerospace et al. Tantalum electrolytic capacitors manufactured with tantalum powder as an anode and tantalum wire as anode lead have the advantages of small volume, large electric capacity, high degree of chip type, good reliability, and long service life, and therefore can operate normally under extreme conditions under which many other capacitors (such as ceramic, aluminum sheet capacitors, etc.) cannot operate.[0003]As to tantalum wire for anode lead of tantalum capacitors, it is required to have high chemical purity, good surface finish and precise dimensions, with its mechanical properties and electronic properties satisfying the strict demands on capacitors. For example, the specific demands on surface finish of tan...

Claims

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Application Information

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IPC IPC(8): H01G4/35H01R43/16
CPCH01G9/012Y10T29/49204H01G9/048B22F3/24B22F5/12C22C1/045H01G9/052B22F2998/10B22F2999/00B21B1/16B22F3/02B22F2003/248B22F3/18B22F2201/03H01G9/12H01G13/00H01G9/0029B21B1/18
Inventor ZHAO, BINGDU, LINGHUIXIE, YONGXUWAN, QUINFENGWANG, HUIFENGQIU, GUOHUA
Owner NINGXIA ORIENT TANTALUM IND