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Method for preparing medium-voltage tantalum powder with improved voltage resisting performance

A technology of tantalum powder and medium pressure, which is applied in the preparation of medium-pressure flake tantalum powder and the field of medium-pressure flake tantalum powder, which can solve the problems of difficult preparation and poor electrical performance.

Active Publication Date: 2014-06-25
NINGXIA ORIENT TANTALUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] As mentioned above, although the existing methods of making tantalum powders introduce several high-pressure and medium-pressure tantalum powder processing methods, these methods are only suitable for a small part of medium-pressure tantalum powders.
However, the other medium-pressure tantalum powder is difficult to produce according to the process described above, or leads to poor electrical properties.

Method used

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  • Method for preparing medium-voltage tantalum powder with improved voltage resisting performance
  • Method for preparing medium-voltage tantalum powder with improved voltage resisting performance
  • Method for preparing medium-voltage tantalum powder with improved voltage resisting performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The tantalum powder after sodium reduction is selected as the raw material, and the main parameters are: O: 1800ppm, C: 20ppm, N: 150ppm, Fe: 15ppm. Use absolute ethanol as the ball milling medium, and select 30Kg of steel balls of ф3mm. Make sure that the ball mill bucket, mixing paddle and steel balls are rust-free and clean. The ball-to-material ratio is controlled at 6:1, and 5Kg of weighed tantalum powder is added into the ball mill bucket of the ball mill for ball milling. The ball mill speed is 80 rpm, and the ball milling time is 15 hours. Then filter the alcohol with suction and pickle according to the conventional pickling conditions. Pickling conditions: the first time: pickling with 10%HNO3+0.5%HF for 2 hours, soaking for 2 hours, pouring out the supernatant, the second time: the same as the first time, and the third time with 12%HNO3+0.7 Pickle with %HF+1%H2O2 for 2 hours, soak for 2 hours, finally pour out the supernatant, add enough water to rinse twice...

Embodiment 2

[0059]The tantalum powder after sodium reduction is selected as the raw material, and the main parameters are: O: 1800ppm, C: 20ppm, N: 150ppm, Fe: 15ppm. Use absolute ethanol as the ball milling medium, and select 30Kg of steel balls of ф3mm. Make sure that the ball mill bucket, mixing paddle and steel balls are rust-free and clean. The ball-to-material ratio is controlled at 6:1, and 5Kg of weighed tantalum powder is added into the ball mill bucket of the ball mill for ball milling. The ball mill speed is 80 rpm, and the ball milling time is 15 hours. Then filter the alcohol with suction and pickle according to the conventional pickling conditions. Pickling conditions: the first pass: with 10% HNO 3 + 0.5% HF pickling for 2 hours, soaking for 2 hours, and pouring out the supernatant. Second pass: Same as the first pass. Use 12%HNO for the third pass 3 +0.7%HF+2%H 2 o 2 Pickling for 2 hours, soaking for 2 hours, finally pour out the supernatant, add enough water to rin...

Embodiment 3

[0064] The tantalum powder after sodium reduction is selected as the raw material, and the main parameters are: O: 1800ppm, C: 20ppm, N: 150ppm, Fe: 15ppm. Use absolute ethanol as the ball milling medium, and select 30Kg of steel balls of ф3mm. Make sure that the ball mill bucket, mixing paddle and steel balls are rust-free and clean. The ball-to-material ratio is controlled at 6:1, and 5Kg of weighed tantalum powder is added into the ball mill bucket of the ball mill for ball milling. The ball mill speed is 80 rpm, and the ball milling time is 15 hours. Then filter the alcohol, pickle according to the conventional pickling conditions, pickling conditions: the first pass: use 10% HNO 3 + 0.5% HF pickling for 2 hours, soaking for 2 hours, and pouring out the supernatant. Second pass: Same as the first pass. Use 12%HNO for the third pass 3 +0.7%HF+2%H 2 o 2 Pickling for 2 hours, soaking for 2 hours, finally pour out the supernatant, add enough water to rinse twice, and add...

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Abstract

The invention relates to a method for preparing medium-voltage tantalum powder with the improved voltage resisting performance and tantalum powder prepared with the method. The technical scheme that oxygen reduction is carried out after twice heating treatment, the third heating treatment is carried out and the oxygen reduction is performed finally is introduced to the method for preparing the medium-voltage tantalum powder with the improved voltage resisting performance. The oxygen content is controlled, the particle morphology of the tantalum powder is improved, the breakdown resisting performance of a product is improved, leaked currents are modified, and the method for preparing the medium-voltage tantalum powder with the improved voltage resisting performance is applicable to preparing of the medium-voltage tantalum powder with the specific volume ranging from 15000 micron FV per gram and 50000 micron FV per gram.

Description

technical field [0001] The invention belongs to the production field of capacitor-grade medium-voltage tantalum powder, and in particular relates to a preparation method of medium-voltage flake tantalum powder with improved withstand voltage performance, and the medium-voltage flake tantalum powder prepared by the method. Background technique [0002] Metal tantalum is a valve metal, which can form a dense oxide film on the surface and has the property of unidirectional conductivity. The anode film made of tantalum powder has stable chemical properties (especially in acidic electrolyte), high resistivity (7.5×1010Ω cm), large dielectric constant (27.6), small leakage current, and has a wide operating temperature range (-80~200℃), high reliability, shock resistance and long service life. Tantalum powder is an ideal material for making tantalum capacitors with small size and high reliability. Because tantalum capacitors have many advantages, they are widely used in electroni...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/00
Inventor 杨国启郑爱国李仲香张丽
Owner NINGXIA ORIENT TANTALUM IND
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