Cobalt-nickel/silica aerogel composite microwave absorb material and preparation method thereof

A composite wave absorbing material and silica technology, applied in the field of wave absorbing materials, can solve the problems of fragility, few reports on the wave absorbing properties of metal aerogel composite materials, singleness, etc., and achieve the effect of enhancing the wave absorbing ability

Active Publication Date: 2019-01-22
承德中宇众航新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silica airgel is composed of nano-sized particles, so its strength is low and it is easy to break, so its use is limited.
[0006] At present, there are reports on airgel composite nanomaterials prepared by introducing metal cobalt and nickel components into aerogels, but only a single nickel or cobalt is introduced. There are few reports on the composites of cobalt-nickel alloys introduced into the materials, and the prepared composites mainly focus on the application of catalytic performance, while the research on the absorbing performance of metal aerogel composites is rarely reported.

Method used

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  • Cobalt-nickel/silica aerogel composite microwave absorb material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A cobalt-nickel / silicon dioxide airgel composite wave-absorbing material comprises silicon dioxide airgel and cobalt, nickel and cobalt-nickel alloy magnetic metal grown on the silicon dioxide airgel in situ.

[0028] The composite wave-absorbing material includes 1-25 parts of cobalt, nickel and cobalt-nickel alloy magnetic metal and 75-99 parts of silicon dioxide aerogel, wherein each of the above components is by mass.

[0029] Cobalt, nickel, and cobalt-nickel alloy magnetic metals can be grown in the form of nanowires in silica airgel materials.

[0030] The present invention also provides a preparation method of a cobalt-nickel / silica airgel composite wave-absorbing material, comprising the following steps:

[0031] Step 1: Mix cobalt nitrate, nickel nitrate, ethylene glycol, tetraethyl orthosilicate, and phosphoric acid, and stir to form a mixed solution, wherein the stirring temperature is 90°C;

[0032] Step 2: After cooling the mixed solution, add isopropanol...

Embodiment 2

[0044] In this embodiment, the molar ratio of cobalt nitrate, nickel nitrate, ethylene glycol, tetraethylorthosilicate, and phosphoric acid in step 1 is 0.08:0.02:4:1:1x10 -3 , using a magnetic stirring device to stir for 10 hours; the mol ratio of the addition of isopropanol and deionized water to ethyl orthosilicate in step 2 is 3:4:1; in step 2, the N,N-dimethylacetamide The molar ratio of the added amount to cobalt nitrate and nickel nitrate is 10:4:1. Other than that, it was the same as in Example 1.

[0045] Through the above steps, the metal content in the prepared absorbing material is 5%, and the specific surface area is 676.5m 2 / g, when the thickness of the composite material is 2mm, the peak reflectivity in the range of 2-18GH can reach -20dB.

Embodiment 3

[0047] as attached figure 1 As shown, in the present embodiment, the molar ratio of cobalt nitrate, nickel nitrate, ethylene glycol, orthosilicate, phosphoric acid in step 1 is 0.25:0.25:5:1:1x10 -3 , using a magnetic stirring device to stir for 10 hours; the mol ratio of the addition of isopropanol and deionized water to ethyl orthosilicate in step 2 is 3:4:1; in step 2, the N,N-dimethylacetamide The molar ratio of the added amount to cobalt nitrate and nickel nitrate is 2:1:1. Other than that, it was the same as in Example 1.

[0048] Through the above steps, the metal content in the prepared absorbing material is 22%, and the specific surface area is 390.6m 2 / g, when the thickness of the composite material is 2mm, the peak reflectivity in the range of 2-18GH can reach -32dB.

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Abstract

The invention discloses a cobalt-nickel / silica aerogel composite microwave absorbing material and a preparation method thereof. The microwave absorbing material comprises a silica aerogel and cobalt,nickel and a cobalt-nickel alloy magnetic metal grown in situ on the silica aerogel. The preparation method comprises the following steps: 1. Mixing cobalt nitrate, nickel nitrate, ethylene glycol, tetraethylorthosilicate and phosphoric acid; 2, cooling the mixed solution, adding isopropanol and deionized water, and continuously stirring; 3, putting the wet gel obtained in the step 2 into the isopropyl alcohol solution of nickel nitrate and cobalt nitrate for normal temperature aging; 4, supercritically dryingaged wet gel in the step 3; The microwave absorbing material has microwave absorbingproperties of magnetic metals of metals such as cobalt, nickel and their alloys. The preparation method can prepare a light microwave absorbing material with rich porous structure.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a cobalt-nickel / silica airgel composite wave-absorbing material and a preparation method thereof. Background technique [0002] Absorbing material is the key factor of stealth technology, plays an important role in modern warfare, and has always been valued by countries all over the world. Traditional absorbing materials, such as single ferrite or metal powder coatings, have been widely studied and applied because of their high magnetic saturation and large theoretical coercive force, but they have a large specificity and a single loss mechanism. The disadvantages limit its use in areas with high demand for lightweight absorbing materials. Therefore, absorbing materials with excellent performance of "light, thin, and wide" have become a hot spot in the development of various countries. [0003] Because of the high saturation magnetization, excellent magnetic per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 冯建杰高志猛刘敏
Owner 承德中宇众航新材料有限公司
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