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Method for preparing high purity vanadium dioxide particles

A technology of vanadium dioxide and vanadium pentoxide, applied in vanadium oxide and other directions, can solve the problems of high preparation cost, complex process, low VO2 phase purity, etc., and achieve mild generation conditions, simplified ultra-fine process, and product performance. and environmentally friendly remarkable effect

Inactive Publication Date: 2008-04-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By comparison, it is found that the current method is either complicated in process and high in preparation cost; or the prepared VO 2 Phase purity is low, often containing vanadium in different valence states

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 2g of vanadium pentoxide and 0.1-0.5g of acetone and mix it for grinding for 10-30 minutes; then put it into a crucible and make the thickness of the material layer uniform; put the crucible into a heating furnace with atmosphere protection In the furnace, feed the protective gas nitrogen and ammonia [volume ratio (15-30): 1; the flow rate of the protective gas nitrogen is 80-200ml / min], and then heat up to 580-630°C and then carry out a constant temperature of 20-20°C. 40 minutes; then lower the temperature in a protective atmosphere, let the reaction product cool down to below 100°C, and finally take it out and perform simple grinding to obtain a pure phase blue-black vanadium dioxide ultrafine powder with a particle size of 100nm to 2μm.

Embodiment 2

[0015] First, take 1g of vanadium pentoxide and 0.1-1g of absolute ethanol, mix and grind it to form a paste. The grinding time is 10-20 minutes, and then put it into a crucible to heat up under a certain atmosphere, in which The volume ratio of gas nitrogen and reducing gas ammonia is (20-40): 1, and the gas flow rate is 200-300ml / min; when the temperature reaches 450-530°C, the constant temperature is carried out, and the constant temperature time is 70-120 minutes; Under the protection of gas, let the reaction product cool down to below 100°C; finally take it out, conduct simple grinding, and classify to obtain a pure phase blue-black vanadium dioxide ultrafine powder with a particle size of 50nm to 1μm.

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Abstract

The present invention belongs to the field of functional inorganic material preparing technology, and is especially fast preparation process of high purity temperature sensitive phase change vanadium dioxide material. The present invention has the features of mild conditions of preparing pure vanadium dioxide, easy control, superfine product grains, simple environment friendly preparation process, high product, cost low, production cost, etc.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional inorganic materials, and in particular relates to a low-cost and rapid preparation method of vanadium dioxide temperature-sensitive phase-change materials. Background technique [0002] Vanadium dioxide VO 2 is a phase-change metal oxide, at temperature T c = 68°C, crystal phase transition occurs, and its resistivity and infrared light transmittance change suddenly, so it is widely used in the fields of intelligent windows that automatically adjust temperature, infrared detectors, and laser protective layers. However, there are many oxides of vanadium, such as: V 2 o 3 、VO 2 , V 2 o 5 etc., of which only VO 2 It has a temperature-sensitive phase transition function. How to prepare pure phase VO at low cost 2 has been restricting VO 2 A key factor for application. Currently preparing VO 2 The most common methods include thermal decomposition, chemical precipitation, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
Inventor 宁桂玲齐济番文杨雪峰林源
Owner DALIAN UNIV OF TECH
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