CN100382215C - Non solid electrolyte tantalum capacitor - Google Patents
Non solid electrolyte tantalum capacitor Download PDFInfo
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- CN100382215C CN100382215C CNB2004100792967A CN200410079296A CN100382215C CN 100382215 C CN100382215 C CN 100382215C CN B2004100792967 A CNB2004100792967 A CN B2004100792967A CN 200410079296 A CN200410079296 A CN 200410079296A CN 100382215 C CN100382215 C CN 100382215C
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- tantalum capacitor
- silver
- solid electrolytic
- pure water
- coating
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Abstract
The present invention relates to a non-solid electrolytic tantalum capacitor which comprises a tantalum anode, a dielectric layer, an electrolytic solution and a silver casing. The non-solid electrolytic tantalum capacitor is characterized in that the contact surface of the inner wall of the silver casing and the electrolytic solution is a carbon layer with the thickness of 3 to 5 mu m; the coating technology of the non-solid electrolytic tantalum capacitor comprises: (a) an HNO3 water solution is injected in the silver casing in the volume ratio of 1:1 and is etched for 20 to 40 minutes at room temperature, a residual solution is poured out, and then the HNO3 water solution is cleaned by pure water and then is dried at 100 to 150 DEG C; (b) colloidal graphite with the mass concentration of 4 to 10% is taken, is agitated until the colloid particles of the colloidal graphite are uniformly dispersed in water, and then is filled the silver casing; the colloidal graphite is solidified at the temperature of 135 to 145 DEG C, is cleaned by pure water and is finally dried. The non-solid electrolytic tantalum capacitor is coated by the electric-conduction colloidal graphite so as to cause the non-solid electrolytic tantalum capacitor to be completely in accord with the requirements of acting as a cathode lead-out material of the tantalum capacitor. The non-solid electrolytic tantalum capacitor has the advantages of favorable electric conductivity, proper porosity and very strong temperature impacting resistance.
Description
Technical field
The present invention relates to the coated technique of non-solid tantalum electrolytic capacitor carbon-coating.
Background technology
Traditional non-solid tantalum electrolytic capacitor in metal shell (being generally silver-colored shell), deceive with sulfuric acid corrosion or platinum plating improve cathode area, the increase capacity is drawn, as pass through plating or the densification of chemical plating one deck, cavernous Pt at silver-colored shell inwall, can reach the H in the absorption electrolyte
+The purpose of particle and the silver-colored shell cathode area of increase, but, big when the capacitor rated capacitance, when CV value is selected in the design of anode fuse greater than 10000 μ FV/g for use, owing to tantalum fuse porosity is little, capacitance after the assembling is drawn the problem that still exists, and makes that the capacitor temperature characterisitic is relatively poor.
Summary of the invention
The purpose of this invention is to provide a kind of condenser capacity that can improve and draw the coated technique of the non-solid tantalum electrolytic capacitor carbon-coating of the tangent value that reduces the wastage.
Technical scheme of the present invention is as follows:
A kind of coated technique of non-solid tantalum electrolytic capacitor carbon-coating is characterized in that: the coated technique of described carbon-coating comprises the following steps
(a) with volume ratio be 1: 1 HNO
3The aqueous solution injects in the silver-colored shell, at room temperature corrodes after 20～40 minutes to pour out raffinate, cleans up with pure water, then 100～150 ℃ of oven dry down;
(b) getting mass concentration is 4～10% aquadag, is stirred to the graphite colloidal particle and is dispersed in the water, injects then in the silver-colored shell, solidifies under 135～145 ℃ temperature, boils with pure water afterwards and washes, and oven dry at last gets final product.
Wherein the aquadag carbon content 10～22%, granularity 1～3 μ m, resistivity 145～220 Ω cm, proportion 1.0～1.15g/cm3.
The present invention adopts the electrically conductive graphite breast as the coating in the non-solid tantalum electrolytic capacitor, aquadag is a graphite ultra micro ion, can form well-balanced during coating, impartial film, easy orientation became coating structure closely when it formed coating, and the bonding force of coating self is very strong, can be because of washing does not cause the coating attenuation, because the complete crystallization of graphite, heatproof obviously improves, meet the requirement of drawing material as the tantalum capacitor negative electrode fully, have good electrical conductivity, an amount of porosity effectively increases and draws 20 times of areas, the hydrogen that energy adsorption capacitance device produces when work, reduce electric double layer, densification and strong adhesion have very strong heatproof degree impact capacity.
The properties of product such as the following table that adopt technical solution of the present invention to make: (4 kinds of specifications are respectively got 12)
The properties of product such as the following table that adopt traditional platinum plating technology to make: (4 kinds of specifications are respectively got 12)
Can find out that by the contrast of the data in the above form using technical scheme of the present invention can effectively improve the non-solid tantalum electrolytic capacitor capacity draws, tangent value reduces the wastage.
Embodiment
Example 1:
The coated technique of carbon-coating comprises the following steps
(a) with volume ratio be 1: 1 HNO
3The aqueous solution injects in the silver-colored shell, at room temperature corrodes after 20 minutes to pour out raffinate, cleans up with pure water, then 100 ℃ of oven dry down;
(b) getting mass concentration is 4% aquadag, is stirred to the graphite colloidal particle and is dispersed in the water, injects then in the silver-colored shell, solidifies under 135 ℃ temperature, boils with pure water afterwards and washes, and oven dry at last gets final product.
The aquadag carbon content of using in the step (b) 10% (weight) wherein, granularity 1 μ m, resistivity 145 Ω cm, proportion 1.0g/cm
3
By above-mentioned technology can be the carbon-coating of 3 μ m at silver-colored shell inwall and the contacted surface formation of electrolyte thickness.
Example 2:
The coated technique of carbon-coating comprises the following steps
(a) with volume ratio be 1: 1 HNO
3The aqueous solution injects in the silver-colored shell, at room temperature corrodes after 30 minutes to pour out raffinate, cleans up with pure water, then 125 ℃ of oven dry down;
(b) getting mass concentration is 7% aquadag, is stirred to the graphite colloidal particle and is dispersed in the water, injects then in the silver-colored shell, solidifies under 140 ℃ temperature, boils with pure water afterwards and washes, and oven dry at last gets final product.
The aquadag carbon content of using in the step (b) 12% (weight) wherein, granularity 2 μ m, resistivity 185 Ω cm, proportion 1.1g/cm
3
By above-mentioned technology can be the carbon-coating of 4 μ m at silver-colored shell inwall and the contacted surface formation of electrolyte thickness.
Example 3:
The coated technique of carbon-coating comprises the following steps
(a) with volume ratio be 1: 1 HNO
3The aqueous solution injects in the silver-colored shell, at room temperature corrodes after 40 minutes to pour out raffinate, cleans up with pure water, then 150 ℃ of oven dry down;
(b) getting mass concentration is 10% aquadag, is stirred to the graphite colloidal particle and is dispersed in the water, injects then in the silver-colored shell, solidifies under 145 ℃ temperature, boils with pure water afterwards and washes, and oven dry at last gets final product.
The aquadag carbon content of using in the step (b) 22% (weight) wherein, granularity 3 μ m, resistivity 220 Ω cm, proportion 1.15g/cm
3
By above-mentioned technology can be the carbon-coating of 5 μ m at silver-colored shell inwall and the contacted surface formation of electrolyte thickness.
Example 4:
The coated technique of carbon-coating comprises the following steps
(a) with volume ratio be 1: 1 HNO
3The aqueous solution injects in the silver-colored shell, at room temperature corrodes after 30 minutes to pour out raffinate, cleans up with pure water, then 135 ℃ of oven dry down;
(b) getting mass concentration is 4% aquadag, is stirred to the graphite colloidal particle and is dispersed in the water, injects then in the silver-colored shell, solidifies under 135 ℃ temperature, boils with pure water afterwards and washes 2 times, each 15 minutes, places at last to dry under 120 ℃ of temperature to get final product.
The aquadag carbon content of using in the step (b) 15% (weight) wherein, granularity 3 μ m, resistivity 155 Ω cm, proportion 1.15g/cm
3
By above-mentioned technology can be the carbon-coating of 5 μ m at silver-colored shell inwall and the contacted surface formation of electrolyte thickness.
The carbon content of using among the present invention 10～22% (weight), granularity 1～3 μ m, resistivity 145～220 Ω cm, the electrically conductive graphite breast of proportion 1.0～1.15g/cm3 can directly buy or preparation voluntarily.
Claims (2)
1. the coated technique of a non-solid tantalum electrolytic capacitor carbon-coating, it is characterized in that: the coated technique of described carbon-coating comprises the following steps
(a) with volume ratio be 1: 1 HNO
3The aqueous solution injects in the silver-colored shell, at room temperature corrodes after 20～40 minutes to pour out raffinate, cleans up with pure water, then 100～150 ℃ of oven dry down;
(b) getting mass concentration is 4～10% aquadag, is stirred to the graphite colloidal particle and is dispersed in the water, injects then in the silver-colored shell, solidifies under 135～145 ℃ temperature, boils with pure water afterwards and washes, and oven dry at last gets final product.
2. the coated technique of non-solid tantalum electrolytic capacitor carbon-coating as claimed in claim 1 is characterized in that: described aquadag carbon content 10～22%, granularity 1～3 μ m, resistivity 145～220 Ω cm, proportion 1.0～1.15g/cm3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100792967A CN100382215C (en) | 2004-09-28 | 2004-09-28 | Non solid electrolyte tantalum capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100792967A CN100382215C (en) | 2004-09-28 | 2004-09-28 | Non solid electrolyte tantalum capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588594A CN1588594A (en) | 2005-03-02 |
| CN100382215C true CN100382215C (en) | 2008-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100792967A Expired - Fee Related CN100382215C (en) | 2004-09-28 | 2004-09-28 | Non solid electrolyte tantalum capacitor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339849B (en) * | 2008-08-08 | 2012-02-08 | 株洲宏达电子有限公司 | Non solid electrolyte all tantalum capacitor and preparation thereof |
| CN103390506B (en) * | 2013-07-30 | 2016-04-27 | 株洲宏达电子股份有限公司 | A kind of microminiature non-solid tantalum electrolytic capacitor and manufacture method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030359C (en) * | 1992-09-25 | 1995-11-22 | 艾夫克斯公司 | Mass production method for the manufacture of surface mount solid state capacitor and resulting capacitor |
| CN1035702C (en) * | 1992-05-27 | 1997-08-20 | 卡伯特公司 | Extruded capacitor electrode and method of making same |
-
2004
- 2004-09-28 CN CNB2004100792967A patent/CN100382215C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035702C (en) * | 1992-05-27 | 1997-08-20 | 卡伯特公司 | Extruded capacitor electrode and method of making same |
| CN1030359C (en) * | 1992-09-25 | 1995-11-22 | 艾夫克斯公司 | Mass production method for the manufacture of surface mount solid state capacitor and resulting capacitor |
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| Publication number | Publication date |
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| CN1588594A (en) | 2005-03-02 |
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Granted publication date: 20080416 Termination date: 20120928 |