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A method for manufacturing tantalum capacitors that improves the fluidity of tantalum powder during the preparation process

A technology of preparation process and manufacturing method, applied in capacitor electrodes, capacitor parts and other directions, can solve the problems of increasing tantalum block powder weight deviation, increasing production process control difficulty, production cost, and molding difficulty, etc. properties, meeting processing requirements, and the effect of pressing uniform density

Active Publication Date: 2015-09-23
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

For example, organic solvents are used to dissolve stearic acid, camphor, acrylic acid and other binders and improve the fluidity of tantalum powder by stirring. It has a certain effect on tantalum powder with a specific volume below 50000μF.V / g, but when the specific volume of tantalum powder is greater than When the flow rate is 70000μF.V / g, the improvement of fluidity is not obvious, the difficulty of forming is increased, the deviation of powder weight of tantalum block is increased, and the difficulty of controlling the production process and the production cost are increased.

Method used

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  • A method for manufacturing tantalum capacitors that improves the fluidity of tantalum powder during the preparation process
  • A method for manufacturing tantalum capacitors that improves the fluidity of tantalum powder during the preparation process
  • A method for manufacturing tantalum capacitors that improves the fluidity of tantalum powder during the preparation process

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Effect test

Embodiment 1

[0014] A method for manufacturing tantalum capacitors that improves the fluidity of tantalum powder during the preparation process. Taking tantalum powder with a CV value of 150,000 μF.V / g to press and form a tantalum block with a powder weight of 8 mg and a size of 0.75×1.0×1.4mm as an example, It consists of the following steps:

[0015] (1) Preparation of water-based adhesive solution: Weigh 100g of tantalum powder, weigh 7% of the weight of tantalum powder (i.e. 7g) of polyethylene glycol into a glass container, add deionized water and stir with a magnetic stirrer for 10 Minutes, let polyethylene glycol fully dissolve, obtain concentration and be the polyethylene glycol solution of 5%;

[0016] (2) Powder mixing: Put the tantalum powder into the polyethylene glycol solution, stir it evenly with a stainless steel rod and add deionized water, stir for 10 minutes, let the tantalum powder disperse evenly in the solution, so that the outer layer of the tantalum powder particles...

Embodiment 2

[0022] A method for manufacturing a tantalum capacitor that improves the fluidity of tantalum powder during the preparation process, comprising the following steps:

[0023] (1) Preparation of water-based adhesive solution: Weigh 5-15% polyethylene glycol by weight of tantalum powder into a glass container, add deionized water and stir for 10-15 minutes with a magnetic stirrer, let the polyethylene glycol The alcohol is fully dissolved to obtain a polyethylene glycol solution with a concentration of 2 to 8%;

[0024] (2) Powder mixing: Put the tantalum powder into the polyethylene glycol solution, stir evenly with a stainless steel rod and add deionized water, stir for 10-15 minutes, let the tantalum powder disperse evenly in the solution, so that the tantalum powder particles layer can form a uniform adhesive layer;

[0025] (3) Spray drying: Pour the tantalum powder mixture into the feeder of the spray drying granulator, the feeding pressure is 5-10Mpa, the air heating temp...

Embodiment 3

[0030] A method for manufacturing a tantalum capacitor that improves the fluidity of tantalum powder during the preparation process, comprising the following steps:

[0031] (1) Preparation of water-based adhesive solution: Weigh 5-15% polyethylene glycol by weight of tantalum powder into a glass container, add deionized water and stir for 10-15 minutes with a magnetic stirrer, let the polyethylene glycol The alcohol is fully dissolved to obtain a polyethylene glycol solution with a concentration of 2 to 8%;

[0032] (2) Powder mixing: Put the tantalum powder into the polyethylene glycol solution, stir evenly with a stainless steel rod and add deionized water, stir for 10-15 minutes, let the tantalum powder disperse evenly in the solution, so that the tantalum powder particles layer can form a uniform adhesive layer;

[0033] (3) Spray drying: Pour the tantalum powder mixture into the feeder of the spray drying granulator, the feeding pressure is 5-10Mpa, the air heating temp...

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Abstract

The invention discloses a tantalum capacitor manufacturing method for improving flowability of tantalum powder in the preparation process. The method includes the steps: (1) preparing aqueous binder solution; (2) mixing the powder; (3) spray drying: pouring tantalum powder mixed liquor into a feeder of a spray drying granulator and performing secondary granulation to obtain near-spherical tantalum powder; (4) performing compression molding; (5) removing binders: boiling and washing a tantalum anode block in deionized water at the temperature of 40-60 DEG C, repeatedly cleaning the tantalum anode block for 2-3 times, taking out the tantalum anode block and drying the tantalum anode block in a drying box at the temperature of 80-90 DEG C for 30-60 minutes. The tantalum capacitor manufacturing method has the advantages that the flowability of the tantalum powder in the preparation process is improved by the aid of the water-soluble binders through secondary granulation in spray drying, the tantalum powder with a high specific volume is uniform in pressed density in the tantalum block molding process, the machining requirement of uniform weight of the tantalum block is met, currently used organic solvents are replaced, industrial pollution is decreased, and the method is suitable for industrial mass production.

Description

technical field [0001] The invention relates to a method for manufacturing a tantalum capacitor that improves the fluidity of tantalum powder during the preparation process, and belongs to the technical field of tantalum capacitor preparation. Background technique [0002] With the development of miniaturization and thinning of electronic complete machine products, complete machine manufacturers also require tantalum capacitors to be small in size and large in 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. Although it has been processed by the tantalum powder manufacturer's agglomeration process, the fluidity of tantalum powder still cannot meet the requirements of tantalum powder. capacitor manufacturer's requirements. For this reason, many tantalum capacitor manufacturers have carried out a lot of research on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02B22F1/00H01G9/04
Inventor 王俊冯建华蒙勇黄艳彭丹刘一峰李慧琴
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD