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High-voltage tantalum powder and preparation method thereof

A technology of tantalum powder and powder electricity is applied in the field of high-pressure tantalum powder and its preparation, which can solve the problems of low specific volume, simple tantalum powder particle shape, and inability to meet the requirements of high-capacity tantalum powder.

Active Publication Date: 2014-12-17
NINGXIA ORIENT TANTALUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tantalum powder electrolyzed by the traditional process has a simple particle shape, coarse particles, and low specific volume, which cannot meet the requirements of the electronics industry for high-capacity tantalum powder.
The carbothermic reduction of tantalum oxide, the hydrogen reduction of tantalum pentachloride and thermite reduction have not yet been used in industrial production.

Method used

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  • High-voltage tantalum powder and preparation method thereof
  • High-voltage tantalum powder and preparation method thereof
  • High-voltage tantalum powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Using high-purity tantalum ingots with a purity of 4N as raw materials, hydrogenation is carried out first. Hydrogenation process conditions: put high-purity tantalum ingots into a cleaned stainless steel crucible, then hoist them into the reaction bomb, and evacuate to 1×10 2 Below Pa, then filled with hydrogen to 1.0×10 5 Pa. Heat to raise the temperature, when the temperature rises to 800°C, keep the temperature for 3 hours. Pay close attention to the internal pressure of the bomb during the heating process, and it must not exceed 2.0×10 5 Pa, in order to prevent excessive pressure from cracking the hose and causing hydrogen leakage. After the heat preservation is over, power off and cool down for hydrogenation, and hydrogen will be replenished in time during the cooling process until the tantalum ingot no longer absorbs hydrogen. Then take out the hydrogenated tantalum ingot and put it into a mill and sieve machine for grinding and sieving to make powder. The ave...

Embodiment 2

[0092] Using high-purity tantalum ingots with a purity of 4N as raw materials, hydrogenation is carried out first. Hydrogenation process conditions: put high-purity tantalum ingots into a cleaned stainless steel crucible, then hoist them into the reaction bomb, and evacuate to 1×10 2 Below Pa, then filled with hydrogen to 1.0×10 5 Pa. Heat to raise the temperature, when the temperature rises to 800°C, keep the temperature for 3 hours. Pay close attention to the internal pressure of the bomb during the heating process, and it must not exceed 2.0×10 5 Pa, in order to prevent excessive pressure from cracking the hose and causing hydrogen leakage. After the heat preservation is over, power off and cool down for hydrogenation, and hydrogen will be replenished in time during the cooling process until the tantalum ingot no longer absorbs hydrogen. Then take out the hydrogenated tantalum ingot and put it into a mill and sieve machine for grinding and sieving to make powder. The ave...

Embodiment 3

[0101]Using high-purity tantalum ingots with a purity of 4N as raw materials, hydrogenation is carried out first. Hydrogenation process conditions: put high-purity tantalum ingots into a cleaned stainless steel crucible, then hoist them into the reaction bomb, and evacuate to 1×10 2 Below Pa, then filled with hydrogen to 1.0×10 5 Pa. Heat to raise the temperature, and when the temperature rises to 850°C, keep the temperature for 3 hours. Pay close attention to the internal pressure of the bomb during the heating process, and it must not exceed 2.0×10 5 Pa, in order to prevent excessive pressure from cracking the hose and causing hydrogen leakage. After the heat preservation is over, power off and cool down for hydrogenation, and hydrogen will be replenished in time during the cooling process until the tantalum ingot no longer absorbs hydrogen. Then take out the hydrogenated tantalum ingot and put it into a mill and sieve machine for grinding and sieving to make powder. The ...

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Abstract

The invention belongs to the field of preparation of capacitor-level high-voltage tantalum powder and particularly relates to high-voltage tantalum powder and a preparation method thereof. The tantalum powder provided by the invention is spherical or ball-like tantalum powder, is round in corner angle, uniform in particle size distribution, relatively small in leakage current and high in breakdown voltage, and can be applied under a relatively high voltage.

Description

technical field [0001] The invention belongs to the field of capacitor-grade high-voltage tantalum powder production, and in particular relates to a high-voltage resistant tantalum powder and a preparation method thereof. The particle shape of the high-voltage resistant tantalum powder provided by the invention is basically spherical or quasi-spherical, with rounded edges and corners, uniform particle size distribution, small leakage current, high breakdown voltage, and can work at higher voltages. 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 stable in acidic electrolyte) and high resistivity (7.5×10 10 Ω·cm), large dielectric constant (27.6), small leakage current, and also has the advantages of wide working temperature range (-80~200℃), high reliability, shock resistance an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/20B22F9/04H01G9/042
Inventor 杨国启郑爱国马跃忠谢群力
Owner NINGXIA ORIENT TANTALUM IND
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