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A kind of production method of high pressure resistant sheet-shaped tantalum powder

A production method and high-voltage-resistant technology, used in transportation and packaging, electrolytic capacitors, capacitors, etc., can solve the problems of low breakdown voltage, poor voltage resistance and reliability, and achieve high breakdown voltage, good burn resistance, short time effect

Active Publication Date: 2021-09-03
江门富祥电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spherical tantalum powder has a large specific surface area and a relatively high specific volume, but its corresponding breakdown voltage is relatively low, and its withstand voltage and reliability are poor, so it is difficult to work under high voltage

Method used

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  • A kind of production method of high pressure resistant sheet-shaped tantalum powder
  • A kind of production method of high pressure resistant sheet-shaped tantalum powder
  • A kind of production method of high pressure resistant sheet-shaped tantalum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use atomized spherical tantalum powder, see SEM figure 2 , wet sieve 1200 mesh, take the undersieve, and carry out planetary ball milling after the classified powder is dried, with analytical pure anhydrous ethanol as the ball milling medium, ball milling time 60min, ball milling ball material ratio is 5:1, ball milling speed is 100r / min. Ball milled powder with HNO 3 and HF mixed acid (concentration of 69% HNO 3 Solution, HF solution with a concentration of 40% is prepared by adding water, HNO 3 Solution, HF solution and water (volume ratio is 20:1:60) pickling to remove metal impurities, drying and sieving to obtain sheet-shaped raw powder. The physical properties and chemical impurity content of the flake-shaped raw powder are shown in Table 1, and SEM is shown in image 3 .

[0041] The above-mentioned sheet-shaped raw powder is subjected to water agglomeration granulation, and the amount of agglomerated water is 18%. After the dough is formed, it is dried a...

Embodiment 2

[0049] Select atomized spherical tantalum powder, wet sieve 1500 mesh, take the undersieve, and carry out planetary ball milling after the classified powder is dried, with analytical pure anhydrous ethanol as the ball milling medium, ball milling time is 180min, and the ball-to-material ratio of ball milling is 4: 1. The ball milling speed is 100r / min. Ball milled powder with HNO 3 and HF mixed acid (concentration of 69% HNO 3 Solution, HF solution with a concentration of 40% is prepared by adding water, HNO 3 Solution, HF solution and water volume ratio is 20:1:60) pickling to remove metal impurities, drying and sieving to obtain sheet-shaped raw powder 2. The physical properties and chemical impurity content of the sheet-shaped raw powder are shown in Table 3.

[0050] The above-mentioned sheet-shaped raw powder is subjected to water agglomeration granulation, and the amount of agglomerated water is 18%. After the dough is formed, it is dried and sieved. at 10 -3 Heate...

Embodiment 3

[0057] Select atomized spherical tantalum powder, wet sieve 1000 mesh, take the undersieve, and carry out planetary ball milling after the classified powder is dried, with analytical pure anhydrous ethanol as the ball milling medium, ball milling time is 30min, and the ball-to-material ratio of ball milling is 8: 1. The ball milling speed is 100r / min. Ball milled powder with HNO 3 and HF mixed acid (concentration of 69% HNO 3 Solution, HF solution with a concentration of 40% is prepared by adding water, HNO 3 Solution, HF solution and water (volume ratio is 20:1:60) pickling to remove metal impurities, drying and sieving to obtain sheet-shaped raw powder 3. The physical properties and chemical impurity content of the sheet-shaped raw powder are shown in Table 5.

[0058] The above-mentioned sheet-shaped raw powder is subjected to water agglomeration granulation, and the amount of agglomerated water is 18%. After the dough is formed, it is dried and sieved. at 10 -3 Heate...

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Abstract

The invention provides a production method of high-pressure-resistant sheet-shaped tantalum powder. The steps of the present invention include: selecting suitable raw powder, grading the raw powder, and screening out the desired raw powder, and the obtained powder is ball milled, pickled, water-agglomerated, heat-treated, and deoxidized to obtain a finished sheet-shaped powder. Compared with other disclosed tantalum flake production processes, the present invention does not use a hydrogenation process, and the ball milling time is short and the process flow is short. The tantalum powder provided by the invention has rounded flake edges, uniform particle size distribution, good fire resistance, small leakage current, high breakdown voltage and can work at a higher 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 sheet-shaped tantalum powder and a preparation method thereof. The high-voltage resistant tantalum powder provided by the invention has a flake shape, round particle edges, uniform particle size distribution, good fire resistance, small leakage current, high breakdown voltage, and can work at higher voltages. Background technique [0002] At present, most tantalum powders are chemically reduced potassium fluorotantalate (K 2 TaF 7 ) prepared. Using this process, the surface area of ​​the powder is given by K 2 TaF 7 Determined by the ratio of diluted salt. The produced agglomerated tantalum powder can be used in a wide range of anode production conditions. Spherical tantalum powder has a large specific surface area and a relatively high specific volume, but its corresponding breakdown voltage is rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00B22F9/14B22F9/08H01G9/042
CPCB22F9/04B22F9/14B22F9/082H01G9/042B22F2009/043B22F1/068B22F1/142B22F1/145B22F1/148
Inventor 王帆郑浩宇朱德忠廖志刚
Owner 江门富祥电子材料有限公司
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