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A Method for Avoiding Out-of-tolerance Loss Tangent of Tantalum Capacitors

A loss tangent, tantalum capacitor technology, applied in the direction of capacitors, electrolytic capacitors, capacitor electrodes, etc., can solve the problems of increasing the ratio of active power to reactive power, increasing loss tangent value, and worse reliability. The effect of reducing the amount of gas, increasing the forming voltage, preventing excessive densification

Active Publication Date: 2017-08-25
CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The electrical properties of capacitors prepared in the prior art deteriorate significantly after the long-life test, especially the loss tangent value increases sharply, which makes the ratio of active power to reactive power of the product larger, and the temperature rise of the product is severe under long-term work, and the reliability becomes lower. Difference

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  • A Method for Avoiding Out-of-tolerance Loss Tangent of Tantalum Capacitors
  • A Method for Avoiding Out-of-tolerance Loss Tangent of Tantalum Capacitors

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Embodiment 1

[0020] A method to avoid the out-of-tolerance loss tangent value of tantalum capacitors, taking CA90 type 60V560μF as an example, it includes the following steps:

[0021] (1), adjust the aspect ratio of the anode substrate, the pressing density, and the sintering temperature;

[0022] The specific adjustment method is: adjust the aspect ratio of the anode substrate to 1.5, that is, L / d=1.5; where L is the length of the sintered substrate, and d is the diameter of the sintered substrate. Adjusting the aspect ratio of the anode matrix can increase the effective area between the positive and negative electrodes of the capacitor, improve the utilization rate of the cathode material, ensure the full extraction of the anode capacity, and reduce the loss tangent of the product.

[0023] In order to ensure the porosity and wettability of the anode block, the pressing density can be adjusted appropriately. Pressed density D 1 1.12D 0 , where D 0 is the nominal pressed density, and...

Embodiment 2

[0032] A method to avoid the out-of-tolerance loss tangent value of tantalum capacitors, taking CA90 type 75V470μF as an example, it includes the following steps:

[0033] (1) Adjust the aspect ratio, compaction density and sintering temperature of the anode substrate;

[0034] The specific adjustment method is: adjust the aspect ratio of the anode substrate to 1.75, that is, L / d=1.75; where L is the length of the sintered substrate, and d is the diameter of the sintered substrate. Adjusting the aspect ratio of the anode matrix can increase the effective area between the positive and negative electrodes of the capacitor, improve the utilization rate of the cathode material, ensure the full extraction of the anode capacity, and reduce the loss tangent of the product.

[0035] In order to ensure the porosity and wettability of the anode block, the pressing density can be adjusted appropriately. Pressed density D 1 The specific adjustment is 1.05D 0 , where D 0 is the nominal...

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Abstract

The invention discloses a method for avoiding the out-of-tolerance loss tangent value of a tantalum capacitor, which comprises the following steps: (1), adjusting the length-to-diameter ratio of the anode substrate, pressing density, and sintering temperature; (2), appropriately increasing the forming voltage; ( 3) Optimize the formula of working electrolyte and adjust the dosage of working electrolyte. The beneficial effects of the present invention are: lowering the sintering temperature, reducing the area of ​​the sintering neck after the anode substrate is sintered, and preventing excessive densification of the particles; increasing the formation voltage, reducing the amount of gas released during the repair process of the oxide dielectric film; determining the sealing of the product The minimum buffer space required inside the cavity. It ensures that the tantalum capacitor can work stably after the 2000h long-life test, and the electrical performance parameters, especially the loss tangent, meet the technical index requirements, which fills the gap in the technology of tantalum capacitors in this field.

Description

technical field [0001] The invention relates to a method for avoiding out-of-tolerance loss tangent value of a tantalum capacitor, in particular to a method for avoiding out-of-tolerance loss tangent value of a capacitor after a long service life, and belongs to the technical field of electrolytic capacitor manufacturing. Background technique [0002] As a common electronic component, tantalum electrolytic capacitors have the functions of storing electricity, charging and discharging, and are mainly used in filtering, energy storage and conversion, marking bypass, coupling and decoupling, and as time constant components. [0003] The electrical properties of capacitors prepared in the prior art deteriorate significantly after the long-life test, especially the loss tangent value increases sharply, which makes the ratio of active power to reactive power of the product larger, and the temperature rise of the product is severe under long-term work, and the reliability becomes lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/145H01G9/04H01G9/052H01G9/035
Inventor 鄢波阳元江张选红杨槐香吴著刚高智红
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD