A preparation method of capacitor grade tantalum powder with high nitrogen content, tantalum powder and tantalum capacitor prepared therefrom

A technology of tantalum powder and powder, which is applied in the field of high specific capacitance capacitor grade tantalum powder and high specific capacitance capacitor production, can solve the problems of low effectiveness, inability to accurately control the amount of nitrogen doping, and inability to obtain high nitrogen content tantalum powder, etc., to achieve The effect of high specific volume, high nitrogen content and accurate control of nitrogen doping amount

Active Publication Date: 2016-12-28
NINGXIA ORIENT TANTALUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nitrogen doping method has low effectiveness, cannot obtain tantalum powder with high nitrogen content, and cannot accurately control the amount of nitrogen doping, so a nitrogen doping process for tantalum powder with good effect and strong controllability is still needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] H with a concentration of 50 g / l and an acidity of 0.9 mol / l 2 TaF 7 Add the solution into the stripping tank, and blow off with compressed air for 6 hours. The purpose of stripping is to dissolve the dissolved in H 2 TaF 7 Part of the organic gas phase in the solution floats to the upper layer of the solution in the stripping tank and is taken away, which can effectively reduce the carbon content in the final potassium fluorotantalate. The stripped H 2 TaF 7 Add 1000l of the solution into the synthesis tank, where the effective volume of the synthesis tank is 1300l.

[0054] Add about 54.6 kg of potassium nitrate in this embodiment (that is, N1 is 0, and N2 is 1.2). Then open the stirring paddle, add 53 liters of HF to adjust the acidity to 1.55mol / l. Inject steam for heat preservation, and the heat preservation time is 20 minutes. After the heat preservation finishes, the synthetic liquid is put into a cooling tank for cooling and crystallization, and the cool...

Embodiment 2

[0057] H with a concentration of 50 g / l and an acidity of 0.9 mol / l 2 TaF 7 Add the solution into the stripping tank, and blow off with compressed air for 6 hours. The stripped H 2 TaF 7 Add 1000l of the solution into the synthesis tank for synthesis, where the effective volume of the synthesis tank is 1300l.

[0058] Add about 38.2Kg of potassium nitrate and 12Kg of KCl (that is, N1 is 0.36, and N2 is 0.84) in this embodiment. Then turn on the stirring paddle, add 53 liters of HF to adjust the acidity to 1.55mol / l, feed steam to keep warm for 30min, after the keep warm, put the synthesis liquid into the cooling tank for cooling and crystallization, the cooling time is 24h. After cooling and crystallization, put the crystals into a centrifuge, add pure water to wash the crystals, and centrifuge to separate the separated liquid and the mother liquor. Crystallize after separation, and then carry out 2 times of drying. The first time uses a far-infrared dryer with a drying t...

Embodiment 3

[0061] H with a concentration of 50 g / l and an acidity of 0.9 mol / l 2 TaF 7 Add the solution into the stripping tank, and blow off with compressed air for 6 hours. The stripped H 2 TaF 7 Add 1000l of the solution into the synthesis tank for synthesis, where the effective volume of the synthesis tank is 1300l.

[0062] Add about 27.3Kg of potassium nitrate and 20Kg of KCl (that is, N1 is 0.6, and N2 is 0.6) in this embodiment. Then turn on the stirring paddle, add 53 liters of HF to adjust the acidity to 1.55mol / l, feed steam to keep warm for 30min, after the keep warm, put the synthesis liquid into the cooling tank for cooling and crystallization, the cooling time is 24h. After cooling and crystallization, put the crystals into a centrifuge, add pure water to wash the crystals, and centrifuge to separate the separated liquid and the mother liquor. Crystallize after separation, and then carry out 2 times of drying. The first time uses a far-infrared dryer with a drying tem...

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Abstract

A method of adding part nitrogen-containing salts in the synthetic process of potassium fluotantalate is provided. Since the procedure of nitrogen doping is conducted during the synthetic process of potassium fluotantalate, the nitrogen content that is more uniform than those obtained from other methods is obtained, and moreover, nitrogen is doped at the early stage, so primary particles are directly affected and accordingly become finer, the specific volume of tantalum powder is higher, and smaller leakage current and loss are realized. The method improves the qualified rate of capacitor products.

Description

technical field [0001] The invention relates to the field of high specific capacitance capacitor grade tantalum powder and high specific capacitance capacitor production. 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 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. [0003] Tantalum capacitors are electronic devices that use tantalum as a metal anode to directly form a dielectric oxide film on the surface of tantalum through anodic oxidation. The specific surface ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 郑爱国杨国启郭涛王治道任萍
Owner NINGXIA ORIENT TANTALUM IND
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