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Method for sintering anode block of tantalum capacitor

A sintering method and technology of tantalum anode blocks, which are applied in the direction of fixed capacitor electrodes, fixed capacitor parts, capacitors, etc., can solve the problems of high price, uneven shrinkage, etc., achieve short process, avoid difficult exhaust, and excellent performance Effect

Active Publication Date: 2012-06-27
TAIKE TECH SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of tantalum powder is expensive, and the use of binder can reduce the waste products produced after pressing and sintering, such as dropped corners and edges, cracking and delamination or distortion, uneven shrinkage, etc.

Method used

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  • Method for sintering anode block of tantalum capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 The sintering method of the tantalum capacitor anode block is suitable for the degreasing and sintering preparation of the tantalum anode block, which is carried out by putting the tantalum anode block formed by pressing the tantalum powder mixed with the binder into a drying furnace filled with a degreasing solvent. The closed low-temperature solvent catalyzes wet dewaxing, then vacuum drying, and then vacuum sintering.

[0026] The specific sintering method is as follows:

[0027] First, mix tantalum powder with a specific volume of about 50KμF·V / g and binder paraffin (including paraffins with different melting points) and press it into a tantalum anode block, then put the tantalum anode block into a stainless steel furnace and inject gasoline for immersion. Sealed and heated to 80°C for solvent-catalyzed dewaxing. The above-mentioned dewaxing treatment process is repeated several times. Transfer the dewaxed tantalum anode block into a vacuum water bath ov...

Embodiment 2

[0028] Example 2 The sintering method of the tantalum capacitor anode block is suitable for the degreasing and sintering preparation of the tantalum anode block, which is carried out by putting the tantalum anode block formed by pressing the tantalum powder mixed with the binder into a drying furnace filled with a degreasing solvent. The closed low-temperature solvent catalyzes wet dewaxing, then vacuum drying, and then vacuum sintering.

[0029] The specific sintering method is as follows:

[0030] Mix tantalum powder with a specific volume of about 70KμF·V / g and binder camphor and press it into a tantalum anode block, then put the tantalum anode block into a stainless steel furnace and inject trichloroethane for immersion. Sealed and heated to 75°C for solvent-catalyzed dewaxing. The above-mentioned dewaxing treatment process is repeated several times. Transfer the dewaxed tantalum anode block into a vacuum water bath oven, adjust the water bath temperature to 70°C, vacuum...

Embodiment 3

[0031] Example 3 The sintering method of the tantalum capacitor anode block is suitable for the degreasing and sintering preparation of the tantalum anode block, which is carried out by putting the tantalum anode block formed by pressing the tantalum powder mixed with the binder into a drying furnace filled with a degreasing solvent. The closed low-temperature solvent catalyzes wet dewaxing, then vacuum drying, and then vacuum sintering.

[0032] The specific sintering method is as follows:

[0033] Mix tantalum powder with a specific volume of about 80KμF·V / g and binder glycerin and press it into a tantalum anode block, then put the tantalum anode block into a stainless steel furnace and inject alcohol for immersion. Sealed and heated to 65°C for solvent-catalyzed dewaxing. The dewaxing treatment was repeated several times in the following sequence. Transfer the dewaxed tantalum anode block into a vacuum water bath oven, adjust the temperature of the water bath to 80°C, vac...

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PUM

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Abstract

A method for sintering an anode block of a tantalum capacitor is characterized by including: placing tantalum anode block pressed by tantalum powder mixed with adhesive in a drying furnace filled with degreased solvent, performing airtight low-temperature solvent catalysis wet dewaxing, drying in vacuum and then performing vacuum sintering. The tantalum anode block obtained through the method maintains high specific surface area and high porosity, so that the tantalum anode block is high in specific capacity and low in leakage current, carbon content and oxygen content of the anode block can respectively drop to 0.005%-0.010% and 0.18% to 0.65%.

Description

technical field [0001] The invention relates to a preparation technology of a tantalum anode block, in particular to a method for sintering a tantalum anode block after wet dewaxing. Background technique [0002] In recent years, with the rapid development of personal computers, mobile phones, and the automobile industry, tantalum capacitors and electronic products are required to be miniaturized and miniaturized. the trend of. However, due to the fine particles, large specific surface area and strong activity of high specific volume tantalum powder, it is easy to cause serious capacitance loss after high temperature sintering, and at low sintering temperature, the shrinkage rate of tantalum anode block is small, the sintering density is low, and the porosity is low. High, the number of open holes is also large, but the refining reaction of impurities is not fully carried out, and the electrical indicators such as voltage resistance and leakage current of tantalum powder wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16
CPCB22F3/10H01G4/008B22F2998/10B22F2999/00H01G9/052H01G13/04B22F2201/20B22F1/10B22F3/02
Inventor 林耀民
Owner TAIKE TECH SUZHOU
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