Unlock instant, AI-driven research and patent intelligence for your innovation.

Monodispersed nickel microsphere powder electromagnetic wave absorbing material and preparing method thereof

A technology for absorbing materials and electromagnetic waves, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficult dispersion, easy agglomeration, and reduced magnetic permeability, etc., and achieve simple process, good wave-absorbing performance, and thin absorbing layer thickness Effect

Active Publication Date: 2016-03-09
SHANDONG UNIV
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The diameters of the nickel microspheres obtained by the method of the above-mentioned prior art are all less than 1 micron, which are prone to agglomeration, and are difficult to disperse in media such as paraffin wax, thus causing a large eddy current loss in the electromagnetic wave environment and reducing the magnetic field. Conductivity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Monodispersed nickel microsphere powder electromagnetic wave absorbing material and preparing method thereof
  • Monodispersed nickel microsphere powder electromagnetic wave absorbing material and preparing method thereof
  • Monodispersed nickel microsphere powder electromagnetic wave absorbing material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A nickel microsphere powder electromagnetic wave absorbing material, the nickel microsphere is composed of monodisperse balls with a diameter of 2-5 microns, the surface of the nickel microsphere is relatively rough, and the height of the concave and convex is ≤400nm (referring to a certain The distance between the bottom of a depression and the top of an adjacent protrusion).

[0041] Preparation:

[0042] by NiCl 2 ·6H 2 O: sodium hydroxide: polyethylene glycol (PEG): triethanolamine (TEA) = 3g:10g:2g:10g mass ratio Weigh raw materials, add 100mL water, react at 200°C for 24 hours, wash and dry, and obtain nickel microsphere powder.

[0043] X-ray powder diffraction pattern (XRD) (such as figure 1 ) shows that the synthesized nickel microspheres are nickel with a face-centered cubic structure, and the comparison with the standard diffraction data shows that the synthesized nickel has a high purity. Scanning electron microscope (SEM) ( figure 2 ) characterizatio...

Embodiment 2

[0048] As described in Example 1, the difference is that diethanolamine is used instead of triethanolamine as a reducing agent to prepare nickel microspheres. Scanning electron microscope (SEM) characterization shows that the size of the synthesized microspheres is 2-6 microns.

[0049] The X-ray powder diffraction pattern (XRD) shows that the synthesized nickel microspheres are nickel with a face-centered cubic structure, and the comparison with the standard diffraction data shows that the synthesized nickel has a high purity. The result of characterizing the synthesized nickel microsphere sample with VSM magnetometer shows that the sample has a saturation magnetic susceptibility of 61.2emu / g and a coercive force of 317.6Oe (H cj ).

Embodiment 3

[0051] As described in Example 1, except that NiCl 2 ·6H 2 O: sodium hydroxide: polyethylene glycol (PEG): triethanolamine (TEA) = 3g: 9g: 1g: 10g, nickel microspheres were prepared, and the scanning electron microscope (SEM) characterization showed that the synthetic microspheres had a size of 3 -8 microns, better dispersion of microspheres.

[0052] The X-ray powder diffraction pattern (XRD) shows that the synthesized nickel microspheres are nickel with a face-centered cubic structure, and the comparison with the standard diffraction data shows that the synthesized nickel has a high purity. The result of characterizing the synthesized nickel microsphere sample with VSM magnetometer shows that the sample has a saturation magnetic susceptibility of 60.8emu / g and a coercive force of 316.4Oe (H cj ).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Heightaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a monodispersed nickel microsphere powder electromagnetic wave absorbing material and a preparing method thereof. The diameter of nickel microspheres ranges from 2 mm to 8 mm, the surfaces of the nickel microspheres are relatively coarse, and concave-convex parts with the height being 400 nm are arranged. By means of the monodispersed nickel microsphere powder electromagnetic wave absorbing material and the preparing method, nickelous salt serves as a precursor for synthesizing the nickel microspheres, sodium hydroxide and ammonium hydroxide serve as precipitators, polyethylene glycol, polyving akohol and polyvinylpyrrolidone serve as surface active agents, and triethanolamine and diethanol amine serve as reducing agents; and the nickel microspheres are synthesized through one-step water-heat method. The prepared nickel microspheres are high in saturation magnetization rate, large in coercive force, good in electromagnetic wave absorbing performance, good in oxidation resistance, simple in preparing process and low in cost.

Description

technical field [0001] The invention relates to a monodisperse nickel microsphere powder electromagnetic wave absorbing material and a preparation method thereof, belonging to the technical field of magnetic and electromagnetic wave absorbing materials. Background technique [0002] With the rapid development of radio communication technology and high-frequency circuit equipment, electromagnetic wave absorbing materials, as an effective means of reducing electromagnetic wave interference, can convert electromagnetic waves into other forms of energy and attenuate them. Magnetic loss, dielectric loss and conductive loss materials can all be used as electromagnetic wave absorbers, and magnetic loss materials have become a hot research topic because thinner electromagnetic wave absorbers can be prepared from them. For magnetic electromagnetic wave absorbing materials, the permeability and permittivity of the material determine its absorption performance. As a traditional magnet...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F1/00B22F9/24
CPCB22F9/24B22F1/05
Inventor 刘久荣刘伟邱松刘玉珍吴楠楠
Owner SHANDONG UNIV