High-voltage-resistant flaky tantalum powder, method for producing the same, and capacitor

By using uniformly sized, high-purity metallurgical-grade tantalum powder combined with ball milling and air jet crushing classification processes, flake-shaped tantalum powder suitable for high-voltage tantalum capacitors was prepared, solving the problems of low specific capacity and poor electrical performance of tantalum powder in the prior art, and realizing the preparation of tantalum powder with high capacity and high reliability.

CN122274162APending Publication Date: 2026-06-26CHINA TUNGSTEN RARE METAL NEW MATERIAL (HUNAN) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA TUNGSTEN RARE METAL NEW MATERIAL (HUNAN) CO LTD
Filing Date
2026-05-06
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing tantalum powder preparation processes cannot meet the requirements of high-capacity and high-voltage tantalum capacitors, and have problems such as uneven particle size, high impurity content, and poor electrical performance.

Method used

Using metallurgical-grade tantalum powder with uniform particle size and high purity as raw material, flake tantalum powder is prepared through ball milling and air jet crushing classification processes to remove excessively fine and coarse particles, improve charge distribution, and enhance specific capacity and reliability.

Benefits of technology

The prepared flake tantalum powder has improved specific capacity, reduced leakage current and loss, and increased breakdown voltage, making it suitable for higher operating voltages. The process is simplified and production costs are reduced.

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Abstract

This invention belongs to the technical field of capacitor anode materials, specifically relating to a high-voltage resistant sheet-like tantalum powder, its preparation method, and a capacitor. The raw materials for preparing the high-voltage resistant sheet-like tantalum powder include metallurgical-grade tantalum powder; the loose bulk density of the metallurgical-grade tantalum powder is 1.5 g / cm³. 3 ~4.0g / cm 3 The average Fisher particle size is 2μm~4μm, and the particle size D50 is 10μm~30μm; the aspect ratio of the high-voltage resistant flake tantalum powder is 5~50. The high-voltage resistant flake tantalum powder provided by this invention can improve the specific capacity and reliability of high-voltage resistant flake tantalum powder.
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