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A kind of manufacturing method of tantalum capacitor that improves the porosity of anode block

A technology of tantalum capacitors and manufacturing methods, which is applied in the direction of capacitors, electrolytic capacitors, circuits, etc., can solve the problems of increased difficulty in production process control, ineffective effects, and deterioration of electrical parameters of tantalum capacitors, so as to achieve easy control, ensure performance indicators, The effect of increasing porosity

Active Publication Date: 2016-03-09
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

The porosity of the tantalum anode block will directly affect the quality of the manganese dioxide coated manganese dioxide in the manufacturing process of the tantalum capacitor, which will directly lead to the deterioration of the electrical parameters of the tantalum capacitor.
Although tantalum electrolytic capacitor manufacturers have improved the binder, increased the proportion of binder, reduced the specific gravity of manganese nitrate solution and added surfactants to ensure product quality, but it made the production process more difficult to control, and the effect was not obvious

Method used

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  • A kind of manufacturing method of tantalum capacitor that improves the porosity of anode block

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Effect test

Embodiment 1

[0014] A method for manufacturing tantalum capacitors that increases the porosity of the anode block, using tantalum powder with a CV value of 150,000 μF.V / g to press into a powder with a weight of 12 mg and a size of 1.0x1.2x1.8mm 3 Taking the tantalum block as an example, it consists of the following steps:

[0015] (1), making a pore-opening agent, including: (a), putting polyvinyl alcohol with a degree of polymerization of 1200 into a glass container and adding deionized water to dissolve; (b), stirring with a magnetic stirrer while heating in a water bath to make The temperature was raised to 90°C until the polyvinyl alcohol was fully dissolved, and then continued to stir for 10 minutes; (c), the solution was filtered and allowed to stand for 24 hours, then put into a drying oven and dried at 100°C for 24 hours to obtain solid polyvinyl alcohol powder, The polyvinyl alcohol powder type cell opener obtained by crushing and screening;

[0016] (2), powder mixing, including...

Embodiment 2

[0020] A method for manufacturing a tantalum capacitor that increases the porosity of the anode block, using tantalum powder with a CV value of 100,000 μF.V / g to press it into a powder with a weight of 18 mg and a size of 0.82x2.0x2.0mm 3 Take the tantalum block as an example, it contains the following steps:

[0021] (1), making a pore-opening agent, including: (a), putting polyvinyl alcohol with a degree of polymerization of 1200 into a glass container and adding deionized water to dissolve; (b), stirring with a magnetic stirrer while heating in a water bath to make The temperature was raised to 90°C until the polyvinyl alcohol was fully dissolved, and then continued to stir for 10 minutes; (c), the solution was filtered and allowed to stand for 24 hours, then put into a drying oven and dried at 100°C for 24 hours to obtain solid polyvinyl alcohol powder, The polyvinyl alcohol powder type cell opener obtained by crushing and screening;

[0022] (2), powder mixing, comprisin...

Embodiment 3

[0026] A method for manufacturing a tantalum capacitor that increases the porosity of an anode block, comprising the following steps:

[0027] (1), making a pore-opening agent, including: (a), putting polyvinyl alcohol with a degree of polymerization of 1200 into a glass container and adding deionized water to dissolve; (b), stirring with a magnetic stirrer while heating in a water bath to make The temperature was raised to 90°C until the polyvinyl alcohol was fully dissolved, and then continued to stir for 10 minutes; (c), the solution was filtered and allowed to stand for 24 hours, then put into a drying oven and dried at 100°C for 24 hours to obtain solid polyvinyl alcohol powder, The polyvinyl alcohol powder type cell opener obtained by crushing and screening;

[0028] (2), powder mixing, comprising: (a), take by weighing 100g of tantalum powder, respectively weigh polyvinyl alcohol powder type pore opening agent and lubricant of 0.4% (that is, 0.4g) of tantalum powder wei...

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Abstract

The invention discloses a tantalum capacitor manufacturing method with the porosity of an anode block improved. The tantalum capacitor manufacturing method includes the following steps that (1) a hole opening agent is prepared, and the polyvinyl alcohol powered hole opening agent obtained through screening is smashed; (2) powder is mixed, wherein the polyvinyl alcohol powered hole opening agent with the weight being 0.1-1% of that of tantalum powder and lubricant with the weight being 0.1-1% of that of the tantalum powder are weighed, and then the tantalum powder is added; (3) compression forming is carried out; (4) degreasing and sintering are carried out, wherein adhesive and stearic acids are removed in a vacuum mode, and holes are formed after the hole opening agent slips out at a medium temperature in the sintering process. The tantalum capacitor manufacturing method with the porosity of the anode block improved has the advantages that the porosity of the anode block is improved through combined utilization of the hole opening agent and the lubricant, and thus the purposes of reducing capacity loss and improving the high frequency characteristic of a tantalum electrolytic capacitor are achieved; when the tantalum anode block is manufactured in a compression mode, the forming quality of the anode block is not affected, the porosity of the anode block is improved after the anode block is sintered, the performance indexes of the tantalum electrolytic capacitor is guaranteed, and the tantalum capacitor manufacturing method is simple in technology control, easy to control and applicable to industrial mass production.

Description

technical field [0001] The invention relates to a method for manufacturing a tantalum capacitor for improving the porosity of an anode block, and belongs to the technical field of tantalum capacitor preparation. Background technique [0002] With the development of tantalum electrolytic capacitors in the direction of miniaturization, thinning and large capacity. The specific capacitance value of tantalum powder, the raw material for tantalum capacitors, is getting higher and higher, and the diameter of tantalum powder particles is getting smaller and smaller. In the process of coating manganese dioxide on tantalum electrolytic capacitors, it becomes more and more difficult for manganese nitrate solution to impregnate tantalum anode blocks. The porosity of the tantalum anode block will directly affect the quality of the coated manganese dioxide in the manufacturing process of the tantalum capacitor, which will directly lead to the deterioration of the electrical parameters o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/052
Inventor 王俊方鸣蒙勇黄艳刘一峰李慧琴张勇
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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