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Nano chromium carbide ferrofluid and preparation method thereof

A nano-chromium carbide and chromium carbide technology, applied in chemical instruments and methods, carbon compounds, nanotechnology, etc., can solve the problems of ferromagnetism that cannot be eliminated, magnetic fluid instability, and magnetic performance degradation

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 during preparation and use to become Fe 2 o 3 And the magnetic properties are greatly reduced; 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 chromium carbide (Cr 3 C 2 ), high-energy ball milling will produce ferromagnetism in nano-chromium carbide, which is not originally magnetic, and the ferromagnetism of chromium carbide is irreversible, that is, the ferromagnetism of nano-chromium carbide after high-energy ball milling cannot be eliminated by annealing or other processes

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 30 g of chromium nitrate nonahydrate and 4 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 1200°C, the heating rate is 10°C / min, and the carbonization holding time is 3 hours. The chromium carbide particles prepared after carbonization were high-energy ball milled in a stainless steel ball mill tank 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 chromium 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 ...

Embodiment 2

[0026] Weigh 40 g of chromium nitrate nonahydrate and 7 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 1100°C, the heating rate is 8°C / min, and the carbonization holding time is 4 hours. The chromium carbide particles prepared after carbonization were high-energy ball milled in a stainless steel ball mill tank 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 chromium 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 o...

Embodiment 3

[0028]Weigh 50g of chromium nitrate nonahydrate and 5g 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 chromium 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 chromium 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...

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Abstract

The invention relates to a nano chromium carbide ferrofluid and a preparation method thereof. High-energy ball milling nano magnetic chromium carbide with the particle size between 40nm and 70nm is used as magnetic particles in the ferrofluid, the precursor is prepared through an aqueous solution batching method, and nano chromium carbide is prepared through a direct carbonization method of chromium oxides; nano magnetic chromium carbide is prepared after high-energy ball milling, nano magnetic chromium carbide particles are pre-dispersed in a base solution and subjected to surface modification to obtain the nano chromium carbide ferrofluid. According to the nano chromium carbide ferrofluid and the preparation method thereof, the nano chromium carbide particle size is between 40nm and 70nm, aggregation is not serious, ferromagnetism is provided after high-energy ball milling, the saturated magnetization is 26.04 emu / g, the saturated magnetic field intensity is 4800 Oe, the nano chromium carbide particles have good dispersity and stability in the base solution after surface modification, the ferrofluid saturated magnetization is 4.32 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, is a highly stable colloidal system formed by nano-scale ferromagnetic or ferrimagnetic particles that are uniformly and dispersedly distributed in 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 is nano-Fe 3 o 4 Magnetic fluid, it is the nanometer Fe that co-precipitation method prepares 3 o ...

Claims

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Application Information

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IPC IPC(8): H01F1/44C01B31/30B82Y30/00C01B32/914
Inventor 唐建成叶楠卓海鸥吴桐
Owner NANCHANG UNIV
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