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NZFO-BTO-type ferromagnetic-ferroelectric ceramic composite nano fiber wave absorbent, wave absorbing coating and preparation method

A technology of composite nanofibers and microwave absorbers, applied in the direction of coatings, artificial filaments made of inorganic materials, etc., can solve the problems of difficult large-scale production, complex process, cumbersome operation, etc., and achieve short preparation cycle, simple process, The effect of easy operation

Active Publication Date: 2014-12-17
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: for above-mentioned existing problems and deficiencies, a kind of chemical composition of the present invention is ( n ) Ni x Zn 1-x Fe 2 o 4 / (1- n ) BaTiO 3 (0≤ x ≤1, 0n < 100mol%), a ferromagnetic / ferroelectric ceramic composite nanofiber microwave absorber with excellent wave-absorbing performance and a preparation method thereof, to solve the application blank of the magnetoelectric ceramic composite nanofiber in the field of electromagnetic wave absorption, and the existing problems of the existing preparation technology Technical problems such as complex process, cumbersome operation, high cost, and difficulty in large-scale production

Method used

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  • NZFO-BTO-type ferromagnetic-ferroelectric ceramic composite nano fiber wave absorbent, wave absorbing coating and preparation method

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Embodiment 1

[0020] According to the ferromagnetic phase Ni 0.5 Zn 0.5 Fe 2 o 4 with ferroelectric BaTiO 3 The molar ratio is 7:3, respectively weigh 0.3659g tetrabutyl titanate, 0.2746 barium acetate, 0.3121 nickel acetate, 0.2753g zinc acetate, 1.7720g iron acetylacetonate and add them to the mixture consisting of 10.7800g acetic acid and 4.6200g ethanol In the solvent (the mass ratio of ethanol to acetic acid is about 0.43), stir magnetically at room temperature until all metal salts are completely dissolved, then weigh 1.6000g polyvinylpyrrolidone (PVP, with an average molecular weight of 1300000) and add it to the above solution, continue Magnetic stirring for about 2 hours forms a homogeneous, transparent and stable spinning precursor solution, wherein the mass percentage of PVP is 8%, and the mass percentage of all metal salts is 15%. The prepared spinning solution is moved into the electrospinning device (Chinese patent 201110201848.7) composed of a DC high-voltage power supply...

Embodiment 2

[0022] Basic process is the same as embodiment 1, and difference is: Ni 0.5 Zn 0.5 Fe 2 o 4 with BaTiO 3 The molar ratio is 5:5, the masses of tetrabutyl titanate, barium acetate, nickel acetate, zinc acetate and iron acetylacetonate are 0.6646g, 0.4988g, 0.2430g, 0.2143g and 1.3793g respectively, and the chemical composition is (50mol% ) Ni 0.5 Zn 0.5 Fe 2 o 4 / (50mol%)BaTiO 3 The ferromagnetic / ferroelectric composite nanofiber microwave absorber has an average diameter of about 220nm, and the ferromagnetic phase Ni 0.5 Zn 0.5 Fe 2 o 4 The average grain size is 45nm, the ferroelectric phase BaTiO 3 The average grain size is 50nm; when the absorber loading is 60% and the coating thickness is 4.0mm, the monolayer (50mol%) Ni 0.5 Zn 0.5 Fe 2 o 4 / (50mol%)BaTiO 3 - The minimum reflectivity of the silicone absorbing coating reaches –28dB at 6.3GHz.

Embodiment 3

[0024] Basic process is the same as embodiment 1, and difference is: Ni 0.5 Zn 0.5 Fe 2 o 4 with BaTiO 3 The molar ratio is 9:1, the masses of tetrabutyl titanate, barium acetate, nickel acetate, zinc acetate and iron acetylacetonate are 0.1127g, 0.0846g, 0.3708g, 0.3271g and 2.1049g respectively, and the chemical composition is (90mol% ) Ni 0.5 Zn 0.5 Fe 2 o 4 / (10mol%)BaTiO 3 The ferromagnetic / ferroelectric composite nanofiber microwave absorber has an average diameter of about 260nm, and the ferromagnetic phase Ni 0.5 Zn 0.5 Fe 2 o 4 The average grain size is 43nm, the ferroelectric phase BaTiO 3 The average grain size is 20nm; when the absorber loading is 60% and the coating thickness is 4.5mm, the monolayer (90mol%) Ni 0.5 Zn 0.5 Fe 2 o 4 / (10mol%)BaTiO 3 - The minimum reflectivity of the silicone absorbing coating reaches –26dB at 7.6GHz.

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Abstract

The invention discloses an NZFO-BTO-type ferromagnetic-ferroelectric ceramic composite nano fiber wave absorbent, a wave absorbing coating and a preparation method. The wave absorbent is formed by a spinel-structured ferromagnetic Ni-Zn ferrite and a perovskite-structure ferroelectric BaTiO3 nanocrystalline. The Ni<x>Zn<1-x>Fe2O4 is 20-50 nm in average grain size. The BaTiO3 is 20-70 nm in average grain size. The grains of the two phases are uniformly distributed in an axial direction of the fiber. A diameter of the fiber is about 100-300 nm. The ferromagnetic-ferroelectric composite nano fiber has strong absorption in almost all of a frequency band of 2-18 GHz. The ferromagnetic-ferroelectric composite nano fiber is wide in frequency band, is strong in absorption, is low in cost, has a widely controllable range in electromagnetic parameters and microwave absorption characteristics, and has an excellent application prospect in the fields of absorption and shield of electromagnetic waves and resistance of electromagnetic interference and pollution.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, in particular to a ferromagnetic / ferroelectric composite absorbing material with a one-dimensional nanostructure and a preparation method thereof, specifically Ni-Zn ferrite / BaTiO 3 Composite nanofiber microwave absorber and its preparation technology. Background technique [0002] With the rapid development and wide application of electronic and communication equipment using GHz frequency electromagnetic waves, the resulting electromagnetic interference and electromagnetic radiation pollution are becoming more and more serious. At the same time, the demand for electromagnetic stealth in modern weapons and equipment is also increasing. In order to eliminate or reduce electromagnetic interference and electromagnetic pollution, and effectively reduce the radar signature of weapons and equipment to improve their survivability and defense capabilities and overall combat perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08C09D7/12C04B35/26C04B35/468
Inventor 向军李佳乐叶芹刘敏徐加焕
Owner JIANGSU UNIV OF SCI & TECH