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

A technology of composite nanofibers and microwave absorbents, which is applied in the directions of radiation-absorbing coatings, coatings, magnetic coatings, etc., can solve the problems of difficult large-scale production, complex process, complicated operation, etc., and achieves short preparation period and process. Simple, easy-to-use effects

Active Publication Date: 2014-12-17
浙江润优新材料科技有限公司
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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 0.4 co 0.2 Zn 0.4 Fe 2 o 4 / (1- n ) BaTiO 3 (0n < 100mol%) and ferromagnetic / ferroelectric ceramic composite nanofiber microwave absorber with excellent wave-absorbing performance and preparation method thereof, solve the application blank of magnetoelectric ceramic composite nanofiber in the field of electromagnetic wave absorption, and 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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  • NCZFO-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 of 0.4062g tetrabutyl titanate, 0.3048g barium acetate, 0.1782g nickel acetate, 0.0892g cobalt acetate, 0.1572g zinc acetate, 1.2645g iron acetylacetonate were added to 10.7800g acetic acid and 4. In a mixed solvent composed of 4.6200g ethanol (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, the average molecular weight is 1300000) Add it into the above solution, continue magnetic stirring for about 2 hours to form a homogeneous, transparent and stable spinning precursor solution, in which the mass percentage of PVP is 8%, and the mass percentage of all metal salts is 15%. Move the prepared spinning solution into the electrospinning device (see Chinese patent 201110201848.7) consisting of a DC high-voltage power supply, a liqu...

Embodiment 2

[0022] Basic process is the same as embodiment 1, and difference is: Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 with BaTiO 3 The molar ratio is 5:5, the masses of tetrabutyl titanate, barium acetate, nickel acetate, cobalt acetate, zinc acetate, and iron acetylacetonate are 0.5306g, 0.3983g, 0.1552g, 0.0777g, 0.1369g, and 1.1013g, respectively. The chemical composition of the ferromagnetic / ferroelectric composite nanofiber microwave absorber is (50mol%) Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 / (50mol%)BaTiO 3 , its average diameter is about 270nm, ferromagnetic phase Ni 0.5 Zn 0.5 Fe 2 o 4 The average grain size of about 56nm, ferroelectric phase BaTiO 3 The average grain size of Ni is about 60nm; when the filling amount of the absorber is 70% (mass fraction, the same below), and the coating thickness is 3.0mm, the monolayer (50mol%) Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 / (50mol%)BaTiO 3 - The minimum reflectivity of the silicone absorbing coating reaches –41dB at 5.1GHz.

Embodiment 3

[0024] Basic process is the same as embodiment 1, and difference is: Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 with BaTiO 3 The molar ratio is 9:1, the masses of tetrabutyl titanate, barium acetate, nickel acetate, cobalt acetate, zinc acetate, and iron acetylacetonate are 0.0891g, 0.0669g, 0.2366g, 0.1184g, 0.2087g, and 1.6789g, respectively. The chemical composition of the ferromagnetic / ferroelectric composite nanofiber microwave absorber is (90mol%) Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 / (10mol%)BaTiO 3 , with an average diameter of about 260nm, ferromagnetic phase Ni 0.5 Zn 0.5 Fe 2 o 4 The average grain size of about 38nm, ferroelectric phase BaTiO 3 The average grain size of Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 / (10mol%)BaTiO 3 - The minimum reflectivity of the silicone absorbing coating reaches –24dB at 8.9GHz.

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Abstract

The invention discloses an NCZFO-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 Ni0.4Co0.2Zn0.4Fe2O4 and a perovskite-structure ferroelectric BaTiO3 nanocrystalline. The Ni0.4Co0.2Zn0.4Fe2O4 is 20-50 nm in average grain size. The BaTiO3 is 20-60 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 referring to Ni 0.4 co 0.2 Zn 0.4 Fe 2 o 4 / 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 capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/23D01D1/02C09D5/32C09D1/00D01D5/00D01F8/18
Inventor 向军李佳乐叶芹刘敏徐加焕
Owner 浙江润优新材料科技有限公司