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Spherical tantalum powder as well as preparation method and application thereof

A technology of tantalum powder and spherical shape, which is applied in the field of spherical tantalum powder. It can solve the problems affecting the performance of capacitor tantalum powder, the process parameters are not adjusted well, and the particle size is uncontrollable, so as to achieve high purity, shorten the process flow, and reduce The effect of pollution sources

Pending Publication Date: 2021-10-29
炎陵龙翔钽铌新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, due to reasons such as unsuitable equipment or poorly adjusted process parameters, the produced tantalum powder often has shortcomings such as irregular particle shape and uncontrollable particle size, which affects the performance of capacitor tantalum powder

Method used

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  • Spherical tantalum powder as well as preparation method and application thereof
  • Spherical tantalum powder as well as preparation method and application thereof
  • Spherical tantalum powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Weigh the FTa-1 tantalum powder in the non-ferrous metal industry standard (YS / T 259-2012 tantalum powder for metallurgy) and mix it in a mixer; put the mixed raw tantalum powder in a press, and press it into powdered tantalum powder Bar compact; place the powdered tantalum billet in a vacuum of 3.2x10 -3 In the vacuum graphite furnace of Pa, raise the temperature of the vacuum graphite furnace to 1800°C with an increment of 100°C / h, keep it warm for 2.5h, and then cool to room temperature to obtain sintered tantalum bars;

[0042] Put the tantalum sintered strip in the melting furnace for the first electron beam melting. The parameters of the first electron beam melting are: the vacuum degree of the melting furnace is 5x10 -3 Pa, the voltage is 20KV, the current is 5A, the feed rate is 19kg / h, and the cooling time is 3h to melt to obtain a tantalum ingot with a diameter of 110mm;

[0043] Put the tantalum ingot in the melting furnace for the second electron beam meltin...

Embodiment 2

[0060] Weigh the FTa-1 tantalum powder in the non-ferrous metal industry standard (YS / T 259-2012 tantalum powder for metallurgy) and mix it in a mixer; put the mixed raw tantalum powder in a press, and press it into powdered tantalum powder Bar compact; place the powdered tantalum billet in a vacuum of 3.8x10 -3 In the vacuum graphite furnace of Pa, raise the temperature of the vacuum graphite furnace to 1900°C with an increment of 100°C / h, keep it warm for 2.5h, and then cool to room temperature to obtain sintered tantalum bars;

[0061] Put the tantalum sintered strip in the melting furnace for the first electron beam melting. The parameters of the first electron beam melting are: the vacuum degree of the melting furnace is 5x10 -3 Pa, the voltage is 22KV, the current is 7A, the feed rate is 22kg / h, and the cooling time is 4h for smelting to obtain a tantalum ingot with a diameter of 110mm;

[0062] Put the tantalum ingot in the melting furnace for the second electron beam ...

Embodiment 3

[0079] Weigh the FTa-1 tantalum powder in the non-ferrous metal industry standard (YS / T 259-2012 tantalum powder for metallurgy) and mix it in a mixer; put the mixed raw tantalum powder in a press, and press it into powdered tantalum powder Bar compact; place the powdered tantalum billet in a vacuum of 3.5x10 -3 In the vacuum graphite furnace of Pa, raise the temperature of the vacuum graphite furnace to 1850°C at an increment of 100°C / h, keep it warm for 2.5h, and then cool to room temperature to obtain sintered tantalum bars;

[0080] Put the tantalum sintered strip in the melting furnace for the first electron beam melting. The parameters of the first electron beam melting are: the vacuum degree of the melting furnace is 5x10 -3 Pa, the voltage is 21KV, the current is 6A, the feed rate is 21kg / h, the cooling time is 3.5h, and the tantalum ingot with a diameter of 110mm is obtained by melting;

[0081] Put the tantalum ingot in the melting furnace for the second electron be...

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Abstract

The invention discloses spherical tantalum powder and a preparation method and application thereof, and relates to the field of metal powder preparation. The preparation method comprises the steps of raw material weighing, briquette preparation, tantalum strip sintering, primary electron beam smelting, secondary electron beam smelting, hydrogenation, tantalum ingot smashing, dehydrogenation, hydraulic classification, drying, heating treatment and mixing, an oxygen content of the prepared spherical tantalum powder is smaller than or equal to 150 ppm, a carbon content is less than or equal to 20 ppm, an iron content is less than or equal to 10 ppm, and the electrical property is that a working voltage of a liquid tantalum capacitor is 75-150 V; a specific capacitance CV of an anode of the capacitor is 2000-4000 [mu] FV / g; and a leakage current is less than or equal to 4.5 * 10 <-4 > [mu] A / [mu] FV, and a breakdown voltage is greater than or equal to 350 V. The tantalum powder has proper particles and pore size distribution and impregnation characteristics, a conductive polymer can enter the anode more easily, more charges are led out, and the capacitance of the anode is higher. And meanwhile, in the anode forming process, an oxidation film grows more uniformly, the leakage current is smaller, and the breakdown voltage is higher.

Description

technical field [0001] The invention relates to the field of metal powders, in particular to a spherical tantalum powder, its preparation method and application. Background technique [0002] Tantalum powder is mainly used in the manufacture of high reliability solid electrolytic capacitors. In terms of material classification, tantalum powder specially used to make capacitors is called capacitor grade tantalum powder. Tantalum powder can be divided into high-voltage tantalum powder (working voltage above 35V) and medium-low voltage high specific volume tantalum powder (working voltage below 25V) according to its different operating voltage. When the button metal powder is used as the anode material of the electrolytic capacitor, the finer the powder, the larger the specific surface area and the higher the specific volume. [0003] There are many specific requirements for tantalum powder used in the preparation of solid electrolytic capacitors. These powders must have a su...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/02B22F3/10B22F9/02B22F9/04C22B9/22C22B34/24H01G9/042H01G9/15
CPCB22F9/04B22F3/02B22F3/1007C22B9/228C22B34/24B22F9/023H01G9/15H01G9/042B22F2009/043Y02P10/25
Inventor 陈尚军蒋泽中蒋任翔
Owner 炎陵龙翔钽铌新材料有限责任公司
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