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Medium-voltage tantalum powder and preparation method thereof

A technology of tantalum powder and raw powder, which is applied in the field of medium pressure tantalum powder and its preparation, can solve the problems of inability to meet the requirements of high-capacity tantalum powder, simple tantalum powder particle shape and coarse particle size, etc.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Load NaCl60kg into the reduction furnace, then raise the temperature according to the preset program, and add K from the feed port when the temperature reaches 920 °C 2 TaF 7 100Kg. After feeding, the temperature was raised to 930°C, and the holding time was calculated. After keeping warm at 930°C for 1 hour, increase the height of the stirring paddle and continue stirring, cool down to 820°C with blowing air, then start to inject sodium steadily, stir while injecting sodium, and keep the temperature at about 920°C. Wherein, the amount of sodium added to the reduction reaction is 31.5Kg. When the reaction temperature drops rapidly, it can be judged that the reduction reaction is over, and the reduction product is obtained.

[0066] The reduction product is crushed by a jaw crusher, and then washed and pickled to obtain the original tantalum powder. Washing and pickling treatment conditions are: first pass: use 10% HNO 3 + 0.5% HF acid wash for 2 hours, soak for 2 h...

Embodiment 2

[0069] Load 60kg of NaCl into the reduction furnace, then raise the temperature according to the preset program, and add K from the feed port when the temperature reaches 920°C 2 TaF 7 100Kg. After feeding, the temperature was raised to 930°C, and the holding time was calculated. After keeping warm at 930°C for 1 hour, increase the height of the stirring paddle and continue stirring, cool down to 820°C with blowing air, then start to inject sodium steadily, stir while injecting sodium, and keep the temperature at about 920°C. Wherein, the amount of sodium added to the reduction reaction is 31.8Kg. When the reaction temperature drops rapidly, it can be judged that the reduction reaction is over, and the reduction product is obtained.

[0070] The reduction product is crushed by a jaw crusher, and then washed and pickled to obtain the original tantalum powder. Washing and pickling treatment conditions are: first pass: use 10% HNO 3 + 0.5% HF acid wash for 2 hours, soak for ...

Embodiment 3

[0073] Load NaCl60kg into the reduction furnace, then raise the temperature according to the preset program, and add K from the feed port when the temperature reaches 920 °C 2 TaF 7 100Kg. After feeding, the temperature was raised to 930°C, and the holding time was calculated. After keeping warm at 930°C for 1 hour, increase the height of the stirring paddle and continue stirring, cool down to 820°C with blowing air, then start to inject sodium steadily, stir while injecting sodium, and keep the temperature at about 920°C. Wherein, the amount of sodium added to the reduction reaction is 32.0Kg. When the reaction temperature drops rapidly, it can be judged that the reduction reaction is over, and the reduction product is obtained.

[0074] The reduction product is crushed by a jaw crusher, and then washed and pickled to obtain the original tantalum powder. Washing and pickling treatment conditions are: first pass: use 10% HNO 3 + 0.5% HF acid wash for 2 hours, soak for 2 h...

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Abstract

The invention belongs to the field of capacitor-grade tantalum powder and particularly relates to medium-voltage tantalum powder and preparation method thereof. The specific capacitance of the tantalum powder provided by the invention is 5000-8000uFV / G, the breakdown voltage is not smaller than 210V, and the tantalum powder has higher breakdown voltage and improved leak current.

Description

technical field [0001] The invention relates to the field of capacitor-grade tantalum powder, in particular to a medium-voltage tantalum powder and a preparation method thereof. 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 produced anodic film has stable chemical properties (especially stable in acidic electrolyte) and high resistivity (7.5×10 10 Ω·cm), large dielectric constant (27.6), and small leakage current. In addition, it also has the advantages of wide working temperature range (-80 ~ 200 ℃), high reliability, shock resistance and long service life. It 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 electronic equipment such as aviation, aerospace, communications, computers, and mobile phones. [0003] The large-scale productio...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/20H01G9/042
Inventor 杨国启郑爱国李仲香谢群力
Owner NINGXIA ORIENT TANTALUM IND
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