A preparation method of high-density ferrite-carbon nanotube composite bulk material

A carbon nanotube composite and bulk material technology, which is applied in the field of preparation of high-density ferrite-carbon nanotube composite bulk materials, can solve problems such as low consistency, easy deformation and cracking, and long production cycle, and achieve The effects of improving production efficiency, promoting grain growth, and increasing sintering density

Inactive Publication Date: 2011-12-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sintering and densification degree of this heating and sintering method needs to be improved, and due to the large internal and external temperature gradient, the uniformity of the ...

Method used

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  • A preparation method of high-density ferrite-carbon nanotube composite bulk material
  • A preparation method of high-density ferrite-carbon nanotube composite bulk material
  • A preparation method of high-density ferrite-carbon nanotube composite bulk material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In this embodiment, the chemical expression of the ferrite-carbon nanotube composite material is 1%CNTs-Ni 0.5 Zn 0.5 Fe 2 o 4 , where 1% means that CNTs account for Ni 0.5 Zn 0.5 Fe 2 o 4 mass percent content. The 1%CNTs-Ni 0.5 Zn 0.5 Fe 2 o 4 The specific preparation method of the bulk material is as follows:

[0041] (1) Weigh 0.5g carbon nanotubes and 150ml concentrated nitric acid to mix, reflux 5h in the oil bath of 150 ℃, prepare the modified carbon nanotubes, then dissolve the modified carbon nanotubes in the process of sodium lignosulfonate In a saturated solution, ultrasonically crush for 45 minutes to obtain a uniformly dispersed carbon nanotube solution;

[0042] (2) Press Ni at room temperature 2+ : Zn 2+ : Fe 3+ The molar ratio is 0.5:0.5:2 and Ni(NO 3 ) 2 ·6H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O, add distilled water and the carbon nanotube solution configured in (1) to obtain a mixed solution, wherein CNTs: Ni 0.5 Zn 0...

Embodiment 2～8

[0047] Same as Example 1, Examples 2-8 are CNTs-MeFe 2 o 4 The preparation method of block material, this method is basically identical with embodiment 1, difference is chemical expression MeFe 2 o 4 The Me element, sintering temperature, and holding time are different, as shown in Table 1 below.

[0048] Table 1 CNTs-MeFe in Examples 2-8 2 o 4 The chemical expression and process conditions

[0049] Example

[0050] For the CNTs-MeFe prepared above 2 o 4 The sample of the bulk material is measured and analyzed, and the relative density of the sample is 98%-99.9% measured by the Archimedes drainage method; the fracture morphology of the sample is observed with a scanning electron microscope, and the obtained morphology is similar to figure 1 , indicating that the sample has a high degree of sintering and densification; the room temperature hysteresis loop of the sample is measured with a physical property measurement system, and a similar figure 2 The curve s...

Embodiment 9～17

[0052] Basically the same as Example 1, Examples 9-17 are CNTs-AFe 12 o 19 The preparation method of the bulk material, the difference is the chemical formula AFe 12 o 19 And the combination of A, as well as the sintering temperature and holding time are different, as shown in Table 2 below.

[0053] Table 2 Synthesis of CNTs-AFe in Examples 9-17 12 o 19 The chemical expression and process conditions

[0054] Example

[0055] For the CNTs-AFe prepared above 12 o 19 The sample of the bulk material is measured and analyzed, and the relative density of the sample is 98%-99.9% measured by the Archimedes drainage method; the fracture morphology of the sample is observed with a scanning electron microscope, and the obtained morphology is similar to figure 1 , indicating that the sample has a high degree of sintering and densification; the room temperature hysteresis loop of the sample is measured by a physical property measurement system, which shows that the sample...

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Abstract

The invention discloses a method for preparing a high-density ferrite-carbon nanotube composite block material, specifically: weighing raw materials according to the stoichiometric ratio of each element in the chemical formula of the ferrite-carbon nanotube composite material, Synthesize the ferrite-carbon nanotube composite material powder, and then obtain the ferrite-carbon nanotube composite material embryo body through granulation molding, put the embryo body into a sagger made of wave-transparent material, and then put the Put the sagger into a professional microwave oven. Under an inert atmosphere, adjust the microwave power, control the heating rate, heat up to the sintering temperature, and finally cool down to room temperature to obtain a ferrite-carbon nanotube composite bulk material. The relative density of the ferrite-carbon nanotube composite bulk material prepared by the invention is as high as 99.99%, the electromagnetic performance is excellent, and the consistency is excellent, the phenomenon of deformation and cracking is greatly reduced, the yield of finished products is improved, and the sintering temperature is also reduced , shorten the holding time, and greatly improve the production efficiency.

Description

technical field [0001] The invention relates to the technical field of magnetic composite materials, in particular to a method for preparing a high-density ferrite-carbon nanotube composite bulk material. Background technique [0002] Ferrite is a double-complex medium, which not only has the ohmic loss, polarization loss, ion and electronic resonance loss of general dielectric materials, but also has the unique domain wall resonance loss, magnetic moment natural resonance loss and particle resonance loss of ferrite. , Therefore, as a microwave absorbing material, it is still the research focus of scientific research and technical workers. Carbon nanotubes (CNTs) materials have excellent axial tensile strength, high elastic modulus and high electrical conductivity, and are an ideal one-dimensional nanofilling material. Combining carbon nanotubes with ferrite to form a ferrite-carbon nanotube composite material can reduce the dielectric loss of carbon nanotubes on the one ha...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 黄庆周小兵胡春峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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