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A kind of preparation method of nanocrystalline vanadium nitride powder

A technology of vanadium nitride and nanocrystals, which is applied in the field of vanadium alloys and nanomaterials, can solve the problems of high maintenance costs, low output, harsh reaction conditions, etc., and achieve the effect of low production costs

Inactive Publication Date: 2016-01-13
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these methods, the chloride and sulfide of vanadium are not easy to prepare, and the reaction conditions are very harsh.
The microwave heating method that has emerged in recent years to prepare vanadium nitride cannot be mass-produced due to the large investment in production equipment, high maintenance costs and low output.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using ammonium metavanadate as the raw material, weigh about 3g of the raw material and put it into a corundum crucible, put the crucible into a tubular atmosphere furnace, and inject ammonia gas for 1 hour before the electric furnace is turned on, the flow rate of ammonia gas is 24L / h, and the heating rate is 10°C / min, the gas-solid reaction is carried out under the condition of industrial ammonia atmosphere. The synthesis temperature is 900°C, heat preservation for 2 hours, cooling to room temperature under the condition of flowing ammonia gas atmosphere, taking out the product, and fully grinding and dispersing.

[0015] The vanadium nitride synthesized by the method is analyzed by X-ray diffraction, only the phase of vanadium nitride is found, and no characteristic spectral peaks of other impurities are observed. The results of high-resolution scanning electron microscope analysis show that the grain size is below 100nm.

Embodiment 2

[0017] Using ammonium metavanadate powder as raw material, weigh about 3g of raw material and put it into a corundum crucible, put the crucible into a tubular atmosphere furnace, and feed ammonia gas for 1 hour before starting the electric furnace, the flow rate of ammonia gas is 20L / h, and the temperature rises The speed is 10°C / min, and the gas-solid reaction is carried out under industrial ammonia atmosphere conditions. The synthesis temperature is 1000°C, heat preservation for 6 hours, cooling to room temperature under the condition of flowing ammonia gas atmosphere, taking out the product, and fully grinding and dispersing.

[0018] The vanadium nitride synthesized by the method is analyzed by X-ray diffraction, only the phase of vanadium nitride is found, and no characteristic spectral peaks of other impurities are observed. High-resolution scanning electron microscope analysis results show that the grain size is below 100nm.

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Abstract

The invention relates to a preparation method of nanocrystal vanadium nitride, and belongs to the fields of vanadium alloy technology and nano materials. The method uses an ammonium metavanadate powder as a raw material. The crucible containing the raw material is placed in a high temperature furnace with controlled atmosphere, high temperature synthesis reaction is carried out in flow ammonia atmosphere, with synthesis temperature of 900-1100 DEG C, and insulation is carried out for 2-10 h; after the reaction, the products are cooled to room temperature in a flowing ammonia atmosphere, removed, and fully ground, so as to obtain a single-phase vanadium nitride powder with grain size below 100 nm.

Description

technical field [0001] The invention relates to a preparation method of nano-vanadium nitride, which belongs to the technical field of vanadium alloy and the field of nano-materials. technical background [0002] Transition metal nitrides have attracted increasing attention due to their excellent physical and chemical properties. Among them, vanadium nitride has excellent characteristics such as high melting point, high hardness, high electrical conductivity, and good chemical stability, and is widely used in cutting tools, molds, structural materials and superconducting materials. Due to its large specific capacity, vanadium nitride can also be used as an electrode material for supercapacitors. In addition, vanadium nitride is a catalyst with high catalytic activity, good selectivity, good stability and anti-poisoning performance. Nano-vanadium nitride can further enhance its catalytic activity due to its large specific surface area. If it is used as a reinforcing phase,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/06B82Y30/00
Inventor 甄强李玲李榕王亚丽肖南布乃敬
Owner SHANGHAI UNIV