Liquid-state metal magnetic fluid and preparation method thereof

A liquid metal and liquid metal alloy technology, applied in the field of magnetic fluid, can solve the problems of complex preparation process, poor uniformity, magnetic particle segregation of magnetic fluid, etc., and achieve the effect of uniform physical properties, high thermal conductivity and simple operation

Inactive Publication Date: 2018-01-05
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of conventional magnetic fluid is complex, the uniformity is poor, and the magnetic particle segregation of magnetic fluid is easy to occur, which affects the application effect of magnetic fluid

Method used

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  • Liquid-state metal magnetic fluid and preparation method thereof
  • Liquid-state metal magnetic fluid and preparation method thereof
  • Liquid-state metal magnetic fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 75.5 wt% of Ga, 24.5 wt% of In, and less than 0.01 wt% of other impurity elements are configured into 100 parts of liquid metal fluid. The D90 particle diameter is 50nm, and the Fe content with a purity of 99.99% is adopted, and the addition amount of Fe powder is 5 parts. The ball milling process adopts a 304 stainless steel ball mill tank and is filled with nitrogen, the nitrogen purity is 99.99%, and agate balls are used. The volume ratio of the sum of the volumes of the liquid metal alloy and the magnetic metal to the balls is 2:1, and the ball milling time is 2:1. 2h, speed 600r / min. Cut off the power supply, and after the ball mill tank is at normal temperature, take out the liquid metal magnetic fluid and test its phase. like figure 1 As shown, the XRD spectrum shows that the magnetic fluid is composed of elemental Fe and liquid Ga and In liquid metals.

Embodiment 2

[0029] Ga 66wt%, In21wt%, Sn13wt%, Zn1wt%, and other impurity elements less than 0.01wt% are configured into 100 parts of liquid metal fluid. The Fe powder with D90 particle size of 1 μm and purity of 99.99% is used, and the addition amount of Fe powder is 2 parts. The Ni powder with D90 particle size of 50 nm and purity of 99.99% is used, and the addition amount of Ni powder is 1 part. A planetary ball mill is used for ball milling. The ball milling process uses a 304 stainless steel ball mill tank and is filled with nitrogen. The nitrogen purity is 99.99%. Agate balls are used. The volume ratio of the sum of the volumes of the liquid metal alloy and the magnetic metal to the balls is 3 : 1, ball milling time 4h, rotating speed 500r / min. Cut off the power supply, and after the temperature of the ball mill tank is at normal temperature, take out the liquid metal magnetic fluid, and observe its appearance photos (such as figure 2 shown). According to the test results, the av...

Embodiment 3

[0031] 90 wt% of Ga, 10 wt% of In, and less than 0.01 wt% of other impurity elements are configured into 100 parts of liquid metal fluid. Ni powder with a D90 particle size of 50nm and a purity of 99.99% was used, and the amount of Ni powder added was 3 parts. A planetary ball mill is used for ball milling. The ball milling process uses a 304 stainless steel ball mill tank and is filled with nitrogen. The nitrogen purity is 99.99%. Agate balls are used. The volume ratio of the sum of the volumes of the liquid metal alloy and the magnetic metal to the ball is 2 : 1, ball milling time 6h, rotating speed 400r / min. Cut off the power supply, and after the temperature of the ball mill tank is at normal temperature, take out the liquid metal magnetic fluid, observe its SEM and its energy spectrum (such as image 3 shown). SEM observation and energy spectrum results show that the magnetic material particles are uniformly dispersed in the liquid metal without agglomeration.

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Abstract

The invention relates to a liquid-state metal magnetic fluid and a preparation method thereof. In the liquid-state metal magnetic fluid, liquid-state metal alloy is used as a fluid medium, magnetic metal particles are doped, the weight ratio of the liquid-state metal alloy and magnetic metal is 100:(1-10), and the magnetic fluid is prepared by mixing of a ball-milling tank. The method is simple tooperate, is efficient and rapid and is suitable for industrial production, mass production can be achieved, and the prepared liquid-state metal magnetic fluid has the advantages of uniform physical property, high electrical conductivity, high heat conductivity and the like.

Description

technical field [0001] The invention relates to the field of magnetic fluid, in particular to a liquid metal magnetic fluid and a preparation method thereof. Background technique [0002] Ferrofluid has both the fluidity of a liquid and the magnetism of a solid magnetic material. It is composed of magnetic solid particles and base carrier liquid. Ferrofluid has no magnetic attraction when it is static, but it exhibits magnetism when an external magnetic field is applied. It can be widely used in fields such as magnetic fluid sealing, shock absorption, medical equipment, sound adjustment, light display, and magnetic fluid power generation under various harsh conditions. . Conventional magnetic fluids are made by mixing magnetic particles, surfactants and base fluids in a certain proportion. In order to keep the magnetic particles in a suspended state for a long time without precipitation, there are certain requirements for the particle size of the magnetic particles, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F41/00
Inventor 崔云涛刘静
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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