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Preparation of vo by hydrogen reduction of ammonium polyvanadate 2 method and heat sensitive device

An ammonium polyvanadate, VO2 technology, applied in the direction of measuring devices, using electrical devices, thermometers with electrical/magnetic components directly sensitive to heat, etc., to achieve the effect of easy operation and low cost

Active Publication Date: 2017-04-05
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no use of ammonium polyvanadate as raw material to prepare VO 2 related reports

Method used

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  • Preparation of vo by hydrogen reduction of ammonium polyvanadate <sub>2</sub> method and heat sensitive device
  • Preparation of vo by hydrogen reduction of ammonium polyvanadate <sub>2</sub> method and heat sensitive device
  • Preparation of vo by hydrogen reduction of ammonium polyvanadate <sub>2</sub> method and heat sensitive device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Purge the tube furnace with hydrogen for 5 minutes, check the gas connection of the system, then put 10g of ammonium polyvanadate into the quartz boat, and send it to the middle of the tube furnace, close the furnace door, and set the hydrogen flow rate to 300mL / min, start the program to heat up to 400°C, stop heating after 120min of heat preservation, keep the hydrogen flowing in during the natural cooling process, open the furnace door and take out the quartz boat when the temperature drops to room temperature, the obtained dark blue sample is VO 2 , the yield was 99.7%.

[0061] The obtained VO prepared in this embodiment 2 The temperature control is press-molded into a rod with a diameter of 10mm and a height of 30mm, and the pressure is 15MPa. The aluminum sheet is used as the electrode sleeve, and the distance between the positive and negative conductive sheets is VO 2 1.5 times the diameter of the temperature control. After testing the sample resistance at di...

Embodiment 2

[0063] Purge the tube furnace with hydrogen for 10 minutes, check the gas connection of the system, then put 15g of ammonium polyvanadate into the quartz boat, and send it to the middle of the tube furnace, close the furnace door, and set the hydrogen flow rate to 320mL / min, start the program to heat up to 350°C, stop heating after 60min of heat preservation, keep hydrogen flowing in the process of natural cooling, open the furnace door and take out the quartz boat when the temperature drops to room temperature, the obtained dark blue sample is VO 2 , the yield was 99.5%.

[0064] The obtained VO prepared in this embodiment 2 The temperature control is press-molded into a rod with a diameter of 20mm and a height of 40mm, and the pressure is 20MPa. The aluminum sheet is used as the electrode sleeve, and the distance between the positive and negative conductive sheets is VO 2 Twice the diameter of the temperature control. After testing the sample resistance at different temp...

Embodiment 3

[0066] Purge the tube furnace with hydrogen for 5 minutes, check the gas connection of the system, then put 10g of ammonium polyvanadate into the quartz boat, and send it to the middle of the tube furnace, close the furnace door, and set the hydrogen flow rate to 300mL / min, start the program to heat up to 450°C, stop heating after 50min of heat preservation, keep the hydrogen flowing in during the natural cooling process, open the furnace door and take out the quartz boat when the temperature drops to room temperature, the obtained dark blue sample is VO 2 , the yield was 99.5%.

[0067] The obtained VO prepared in this embodiment 2 The temperature control is press-molded into a rod with a diameter of 20mm and a height of 30mm, and the pressure is 25MPa. The copper sheet is used as the electrode sleeve, and the distance between the positive and negative conductive sheets is 2.2 times the diameter of the VO2 temperature control. After testing the sample resistance at differe...

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Abstract

The invention belongs to the technical field of material preparation and processing, particularly relates to a method for preparing VO2 by reducing ammonium polyorthovanadate with hydrogen and a thermosensitive device, and aims to provide the method for preparing VO2 by reducing ammonium polyorthovanadate with hydrogen. The method comprises the following steps: introducing excessive hydrogen into ammonium polyorthovanadate; carrying out heating for reduction to obtain VO2, wherein the reduction temperature is 300 to 700 DEG C. The invention further provides application of VO2 to the thermosensitive device. The method is used for preparing VO2 with lowered phase change, and has the advantages that the adopted equipment is simple; the raw material cost and the energy consumption, as well as the generation of three wastes, are low.

Description

technical field [0001] The invention belongs to the technical field of material preparation and processing, and in particular relates to the preparation of VO by hydrogen reduction of ammonium polyvanadate 2 The method and heat-sensitive device. Background technique [0002] Vanadium dioxide (VO 2 ) is a metal oxide with thermally induced phase transition properties. It can undergo a transition from a semiconductor phase (M phase) to a metal phase (R phase) at 68°C, accompanied by a change in near-infrared transmittance from high to low. . The phase change of vanadium dioxide makes it show thermal mutagenic properties in optical, electrical, magnetic properties, etc. It is widely used in smart windows, thermistors, temperature control switches, energy-saving coatings, optical storage and other fields. However, the phase transition temperature (68 °C) of vanadium dioxide is much higher than room temperature, which greatly limits its application range. Therefore, the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02H01C7/04G01K7/22
CPCC01G31/02C01P2002/72C01P2006/40G01K7/22H01C7/047
Inventor 赖奇刘干胡洋马建文波刘景景
Owner PANZHIHUA UNIV
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