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Method for preparing tantalum powder

A technology of tantalum powder and powder, which is applied in the field of rare metal smelting, can solve the problems of complex equipment, difficult capacitors, and high requirements for reduction equipment, and achieve the effect of improving physical properties and uniform grain size

Active Publication Date: 2016-06-15
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

The disadvantage of this method is that it has high requirements on the reduction equipment and the equipment is complicated, so it is necessary to further study the reduction device with good reduction effect and no pollution to the product.
Another obvious drawback of the technology mentioned is that the carbon contaminates the metal powder, making it difficult to use it for the manufacture of capacitors.

Method used

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  • Method for preparing tantalum powder

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Experimental program
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Effect test

Embodiment 1

[0031] Take 130 g of sucrose (equivalent to 0.8 times the stoichiometric amount of the reducing agent required to remove the oxygen content in the tantalum oxide powder) and 630 mL of deionized water and mix evenly. Take 500g of tantalum pentoxide powder (Fsss average particle size: 0.6 μm, SBD bulk density: 0.71g / m3) passed through a 60-mesh sieve, add the above sucrose solution and stir evenly to prepare a mixed solution. Put the mixed solution in a filter press, apply a pressure of 0.15 MP for press filtration, put the filter cake into a hot air drying oven, raise it to 110°C at a rate of 5°C per hour, keep it warm for 30 minutes, then cool it down to 90°C, and keep it warm for 4 hours to dry. After the material is dried, it is crushed and passed through a 70-mesh sieve. Place the obtained powder in a tantalum crucible, then put it in a vacuum furnace, heat up to 1450°C after vacuuming, keep it for 1 hour, then raise the temperature to 1700°C, keep it for 10 minutes, after...

Embodiment 2

[0037] Get 136g of glucose (equivalent to 0.8 times the stoichiometric amount of the reducing agent needed to remove the oxygen content in the tantalum oxide powder) and 640mL of deionized water and mix evenly. Get 500g of tantalum pentoxide powder (Fsss average particle size: 0.5 μm, SBD bulk density: 0.68g / m3) through a 60-mesh sieve 3 ) was added to the above glucose solution and stirred evenly to obtain a mixed solution. Put the mixed solution in a filter press and apply a pressure of 0.1 MP for pressure filtration. The filter cake is put into a hot air drying oven, raised to 110°C at a rate of 5°C per hour, and kept for 30 minutes, then cooled to 80°C, and kept for 4 hours. drying. The dried material is crushed and passed through a 70-mesh sieve. Place the obtained powder in a tantalum crucible, then put the tantalum crucible with the material in a vacuum furnace, heat up to 1450°C after vacuuming, keep it for 1 hour, then raise the temperature to 1700°C, keep it for 10...

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Abstract

The invention provides a method for preparing tantalum powder with the high specific volume. The method includes the following steps that 1, tantalum pentoxide and a carbonaceous reducing agent are taken by weight, dissolved in deionized water and stirred to be even to obtain mixed liquid; the prepared mixed liquid is put into a pressure filter and subjected to filter pressing in a pressing mode to obtain a filter cake; the filter cake is heated, dried, smashed and sieved to obtain precursor powder with tantalum oxide and carbon sources finally; 2, the precursor powder obtained in the step 1 is placed into a vacuum furnace and subjected to carbon reduction under the vacuum to obtain tantalum oxide powder with the low oxygen content; 3, low oxidation state powder of tantalum and mental magnesium powder are mixed and then subjected to a reduction reaction in the atmosphere of inert gas or vacuum to obtain high-oxygen tantalum powder; 4, the high-oxygen tantalum powder and magnesium powder are mixed and deoxidized for the second time to obtain tantalum metal powder suitable for a capacitor; after the step that the tantalum powder is deoxidized through magnesium, magnesium oxide and residual magnesium metal are removed from a reaction product.

Description

technical field [0001] The invention relates to the field of rare metal smelting, relates to the processing technology of tantalum powder, and provides a preparation method of tantalum powder for capacitors, in particular to the preparation of tantalum powder precursor by carbothermal reduction of tantalum pentoxide, followed by doping, Deoxidized to produce tantalum powder suitable for capacitor anode blocks. 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 of the tantalum capacitor made by it has stable chemical properties, high resistivity, large dielectric constant and low leakage current. In addition, tantalum capacitors also have the advantages of wide operating temperature range, high reliability, shock resistance and long service life. Therefore, it is an ideal material for making capacitors with small size and high reliability. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20
CPCB22F9/20
Inventor 陈尚军刘强陈思佳
Owner 炎陵龙翔钽铌新材料有限责任公司