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Method for synthesizing tantalum carbide superfine powder through molten salt assisted magnesiothermic reduction

A technology of ultra-fine powder and tantalum carbide, which is applied in the field of synthesizing tantalum carbide ultra-fine powder by molten salt-assisted magnesium thermal reduction, can solve problems such as no retrieval, and achieve the effects of reducing synthesis temperature, high purity and low preparation temperature

Inactive Publication Date: 2016-04-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are no documents or published invention patents on the low-temperature preparation of tantalum carbide ultrafine powder using molten salt as the medium, tantalum oxide and carbon black as raw materials, and Mg powder as the reducing agent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Press Ta 2 o 5 The molar ratio of powder: Mg powder: carbon black is 1:6:2, and the mixture is uniformly mixed to obtain the mixture 1; the molten salt NaC, KCl, and KF are weighed and mixed according to the molar ratio of 1:1:0.1 to obtain the salt mixture. 2; Mix the mixture 1 and the salt mixture 2 according to the mass ratio of 1:3 and mix them evenly to obtain the mixed powder 3; place the mixed powder 3 in a graphite crucible to add a cover, then put the crucible into a tube furnace, Under a flowing argon atmosphere, the temperature was raised to 1150°C at a heating rate of 3°C / min, kept for 6 hours, cooled to room temperature, and then taken out; the product was placed in a 2mol / L hydrochloric acid solution with magnetic stirring for 4h, and then washed with deionized water Remove the molten salt, separate the tantalum carbide powder from the solution with a centrifuge (8000 rpm), and dry at 110°C for 8 hours to obtain an ultrafine TaC powder with a particle siz...

Embodiment 2

[0024] Press Ta 2 o 5 The molar ratio of powder: Mg powder: carbon black is 1:5.5:2, and the mixture is uniformly mixed to obtain the mixture 1; the molten salt NaCl, KCl, and KF are weighed and mixed according to the molar ratio of 1:1:0.1 to obtain the salt mixture. 2; Mix the mixture 1 and the salt mixture 2 according to the mass ratio of 1:5 and mix them evenly to obtain the mixed powder 3; place the mixed powder 3 in a graphite crucible and cover it, then put the crucible in a tube furnace, Under a flowing argon atmosphere, heat up to 1200°C at a heating rate of 10°C / min and keep it warm for 4 hours, take it out after cooling to room temperature; place the product in a 1.5mol / L hydrochloric acid solution for 4h, and then wash it with deionized water Remove the molten salt, separate the tantalum carbide powder from the solution with a centrifuge (11,000 rpm), and dry at 110°C for 8 hours to obtain an ultrafine TaC powder with a particle size of less than 3 μm.

Embodiment 3

[0026] Press Ta 2 o 5 The molar ratio of powder: Mg powder: carbon black is 1:5.25:2, and the mixture is uniformly mixed to obtain the mixture 1; the molten salt NaCl, KCl, and KF are weighed and mixed according to the molar ratio of 1:1:0.1 to obtain the salt mixture. 2; Mix the mixture 1 and the salt mixture 2 according to the mass ratio of 1:5 and mix them evenly to obtain the mixed powder 3; place the mixed powder 3 in a graphite crucible and cover it, then put the crucible in a tube furnace, Under a flowing argon atmosphere, the temperature was raised to 1230°C at a heating rate of 15°C / min, kept for 3 hours, cooled to room temperature, and then taken out; the product was placed in a 1mol / L hydrochloric acid solution with magnetic stirring for 8h, and then washed with deionized water Remove the molten salt, separate the tantalum carbide powder from the solution with a centrifuge (9000 rpm), and dry at 110°C for 8 hours to obtain an ultrafine TaC powder with a particle si...

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Abstract

The invention discloses a method for synthesizing tantalum carbide superfine powder through molten salt assisted magnesiothermic reduction. The method includes: using tantalum oxide and carbon black as raw materials, NaCl, KCl and KF as molten salts and magnesium powder as a reductant; weighing the raw materials proportionally; mixing the raw materials well, and filling a graphite crucible with a mixture of the raw materials; performing low-temperature carbothermic reduction in a flowing argon atmosphere to prepare the tantalum carbide superfine powder. The method is simple in process, easy in preparation condition control and low in cost. The tantalum carbide superfine powder prepared by the method can be applied to producing modifiers of ultrahigh-temperature tantalum carbide ceramic and hard alloys.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a method for synthesizing superfine tantalum carbide powders through magnesia thermal reduction assisted by molten salt. Background technique [0002] Tantalum carbide (TaC) is an important high-temperature structural material with high strength, corrosion resistance and good chemical stability. Its melting point is as high as 3880°C. Ablation resistance, high hardness and other characteristics can be used as high temperature resistant materials and cemented carbide additives. At present, domestic reports on the preparation of tantalum carbide powder mainly use tantalum oxide and tantalum powder as the tantalum source and carbon black as the carbon source to prepare tantalum carbide through high-temperature carbonization. The synthesis temperature is relatively high, and the product needs to be regrinded. Tantalum carbide powder was obtained....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30
CPCC01P2004/60C01P2006/80
Inventor 贾全利闫帅张仕鸣张举刘新红
Owner ZHENGZHOU UNIV
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