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Nano vanadium carbide ferrofluid and preparation method thereof

A vanadium carbide and ferrofluid technology, applied in the fields of magnetic liquid, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problems of ferromagnetism that cannot be eliminated, magnetic fluid instability, and magnetic performance degradation, and achieves the suppression of crystal grains. The effect of growing up, preventing agglomeration and settling, and maintaining stability

Inactive Publication Date: 2014-02-26
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Fe 3 o 4 Magnetic fluid has the advantages of simple and convenient preparation process and low cost, but due to the 3 o 4 It has a high specific surface area and is easily oxidized to Fe during preparation, storage and use. 2 o 3 The magnetic properties are greatly reduced, which affects the use; in addition, Fe 3 o 4 Ferrofluid has relatively high requirements on the use environment, and it can only be stable at a specific pH value. Too much acid or too alkali will destabilize the ferrofluid, and even dissolve Fe. 3 o 4 Nanoparticles
[0004] Nano-vanadium carbide (VC) can be prepared by direct carbonization of vanadium oxide. High-energy ball milling will cause ferromagnetic nano-vanadium carbide particles that are not originally magnetic, and this ferromagnetism is irreversible, that is, nano-carbonization after high-energy ball milling The ferromagnetism of vanadium cannot be eliminated by annealing or other processes

Method used

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  • Nano vanadium carbide ferrofluid and preparation method thereof
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  • Nano vanadium carbide ferrofluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 30g of vanadium trioxide and 12g of anhydrous glucose, dissolve them in deionized water at 80°C, and mix the raw materials thoroughly with electric stirring, then prepare the precursor required for carbonization by spray drying. Put the precursor powder into a tube-type atmosphere furnace, pass in hydrogen for carbonization, hold at 550°C for 1 hour, then rise to the carbonization temperature of 1200°C, the heating rate is 10°C / min, and the carbonization holding time is 3 hours. The vanadium carbide particles prepared after carbonization were high-energy ball milled in a stainless steel ball mill jar for 6 hours, the ball-to-material ratio was 10:1, and the speed was 400r / min. Using the sedimentation effect of a strong magnetic field, the nano-magnetic vanadium carbide particles are repeatedly washed with secondary deionized water and absolute ethanol to remove residual carbon and other non-magnetic impurities, and then added to a certain proportion of base liquid ...

Embodiment 2

[0026] Weigh 20 g of ammonium metavanadate and 8 g of anhydrous glucose, dissolve them in deionized water at 80 ° C, and mix the raw materials thoroughly with electric stirring, then prepare the precursor required for carbonization by spray drying. Put the precursor powder into a tube-type atmosphere furnace, pass in hydrogen for carbonization, hold at 550°C for 1 hour, then rise to the carbonization temperature of 1150°C, the heating rate is 8°C / min, and the carbonization holding time is 4 hours. The vanadium carbide particles prepared after carbonization were high-energy ball milled in a stainless steel ball mill jar for 7 hours, the ball-to-material ratio was 10:1, and the speed was 400r / min. Using the sedimentation effect of a strong magnetic field, the nano-magnetic vanadium carbide particles are repeatedly washed with secondary deionized water and absolute ethanol to remove residual carbon and other non-magnetic impurities, and then added to a certain proportion of base l...

Embodiment 3

[0028]Weigh 30g of ammonium polyvanadate and 15g of anhydrous glucose, dissolve them in deionized water at 80°C, and mix the raw materials thoroughly with electric stirring, then prepare the precursor required for carbonization by spray drying. Put the precursor powder into a tube-type atmosphere furnace, pass in hydrogen for carbonization, hold at 550°C for 1 hour, and then rise to the carbonization temperature of 1300°C, the heating rate is 10°C / min, and the carbonization holding time is 2.5 hours. The vanadium carbide particles prepared after carbonization were high-energy ball milled in a stainless steel ball mill tank for 8 hours, the ball-to-material ratio was 10:1, and the speed was 400r / min. Using the sedimentation effect of a strong magnetic field, the nano-magnetic vanadium carbide particles are repeatedly washed with secondary deionized water and absolute ethanol to remove residual carbon and other non-magnetic impurities, and then added to a certain proportion of ba...

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Abstract

The invention relates to a nano vanadium carbide ferrofluid and a preparation method thereof. High-energy ball milling nano magnetic vanadium carbide with the particle size between 30nm and 60nm is used as magnetic particles in the ferrofluid, the precursor is prepared through an aqueous solution batching method, and nano vanadium carbide is prepared through a direct carbonization method of vanadium oxides; nano magnetic vanadium carbide is prepared after high-energy ball milling, nano magnetic vanadium carbide particles are pre-dispersed in a base solution and subjected to surface modification to obtain the nano vanadium carbide ferrofluid. According to the nano vanadium carbide ferrofluid and the preparation method thereof, the nano vanadium carbide particle size is between 30nm and 60nm, aggregation is not serious, ferromagnetism is provided after high-energy ball milling, the saturated magnetization is 48.02 emu / g, the saturated magnetic field intensity is 4000 Oe, the nano vanadium carbide particles have good dispersity and stability in the base solution after surface modification, the ferrofluid saturated magnetization is 6.87 emu / g, and the ferrofluid can be used for ferrofluid sealing, lubrication, damping and the like and can be used in specific environments such as the strong oxidizing environment.

Description

technical field [0001] The invention belongs to the field of magnetic fluid material and its preparation. Background technique [0002] Magnetic fluid, also known as ferrofluid (Ferrofluid), is a high-stability colloidal system formed by nano-scale ferromagnetic or ferrimagnetic particles that are uniformly dispersed in a liquid base fluid after surface modification. Due to the combination of solid magnetism and liquid fluidity, ferrofluid can exhibit many excellent special properties under the action of a magnetic field, and has good application prospects in electronic information, aerospace, national defense, precision manufacturing, and biomedicine. [0003] Magnetic fluid can be divided into ferrite magnetic fluid, metal and its alloy magnetic fluid and ferronitride magnetic fluid according to the type of magnetic particles. At present, the most researched and applied nano-ferric oxide (Fe 3 o 4 ) magnetic fluid, which is nano-Fe prepared by co-precipitation method 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F41/02
Inventor 唐建成叶楠卓海鸥吴桐
Owner NANCHANG UNIV
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