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Barium titanate/cobaltosic oxide complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution and preparation method

A microstructure and millimeter wave technology, applied in the field of absorbing materials, can solve the problems of low impedance matching, high absorbing loss of impedance matching, large difference between dielectric properties and magnetic properties at high frequencies, etc. The effect of absorption band, low cost, high reflection loss

Active Publication Date: 2018-12-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-impedance matching, high-frequency resonance and high absorbing loss for the problems of low impedance matching of existing complex-phase absorbing materials and large differences between dielectric properties and magnetic properties at high frequencies. BaTiO with multi-level microstructure distribution and wide absorbing frequency band 3 / Co 3 o 4 Composite millimeter wave absorbing powder and preparation method thereof

Method used

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  • Barium titanate/cobaltosic oxide complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution and preparation method
  • Barium titanate/cobaltosic oxide complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution and preparation method
  • Barium titanate/cobaltosic oxide complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Dissolve 0.6 mol of tetrabutyl titanate in 80 mL of ethylene glycol methyl ether, add an appropriate amount of deionized water to promote dissolution, and magnetically stir for 2 hours to obtain a transparent Ti sol precursor;

[0033] 2. Weigh 0.6 mol of barium acetate powder and dissolve it in 20 mL of glacial acetic acid, add an appropriate amount of deionized water to promote dissolution, and stir magnetically for 2 hours to obtain a transparent Ba sol precursor;

[0034] 3. Drain the Ba sol in step 2 into the Ti sol in step 1, add an appropriate amount of deionized water into the drain, and stir magnetically for 3 hours to obtain the BTO sol;

[0035] 4. Weigh 0.4mol of Co powder and add it to the BTO sol in step 3, and stir it mechanically for 2 hours to obtain Co-BaTiO 3 (Co-BTO) composite sol;

[0036] 5. Put the composite sol in step 4 into an oven and dry at 100°C for 3 days to obtain the precursor powder;

[0037] 6. Ball mill the precursor powder in ste...

Embodiment 2

[0045] 1. Dissolve 0.4 mol of tetrabutyl titanate in 90 mL of ethylene glycol methyl ether, add an appropriate amount of deionized water to promote dissolution, and stir magnetically for 2.5 hours to obtain a transparent Ti sol precursor;

[0046] 2. Weigh 0.4 mol of barium acetate powder and dissolve it in 20 mL of glacial acetic acid, add an appropriate amount of deionized water to promote dissolution, and stir magnetically for 2.5 hours to obtain a transparent Ba sol precursor;

[0047] 3. Drain the Ba sol in step 2 into the Ti sol in step 1, add an appropriate amount of deionized water into the drain, and stir magnetically for 4 hours to obtain the BTO sol;

[0048] 4. Weigh 0.6mol of Co powder and add it to the BTO sol in step 3, stir mechanically for 3 hours to obtain Co-BaTiO 3 (Co-BTO) composite sol;

[0049] 5. Put the composite sol in step 4 into an oven and dry at 110°C for 4 days to obtain the precursor powder;

[0050] 6. Ball mill the precursor powder in step 5...

Embodiment 3

[0058] 1. Dissolve 0.4mol of tetrabutyl titanate in 100mL of ethylene glycol methyl ether, add an appropriate amount of deionized water to promote dissolution, and magnetically stir for 3 hours to obtain a transparent Ti sol precursor;

[0059] 2. Weigh 0.4 mol of barium acetate powder and dissolve it in 20 mL of glacial acetic acid, add an appropriate amount of deionized water to promote dissolution, and stir magnetically for 3 hours to obtain a transparent Ba sol precursor;

[0060] 3. Drain the Ba sol in step 2 into the Ti sol in step 1, add an appropriate amount of deionized water into the drain, and stir magnetically for 5 hours to obtain the BTO sol;

[0061] 4. Weigh 0.6mol of Co powder and add it to the BTO sol in step 3, stir mechanically for 3 hours to obtain Co-BaTiO 3 (Co-BTO) composite sol;

[0062] 5. Put the composite sol in step 4 into an oven and dry at 120°C for 5 days to obtain the precursor powder;

[0063] 6. Ball mill the precursor powder in step 5, and...

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Abstract

The invention discloses BaTiO3 / Co3O4 oxide complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution and a preparation method. The complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution is obtained by firstly preparing precursor powder through a sol-gel method, performing ball milling, then executing the multi-step regulation and control heat treatment process including decomposition, control nucleation, dense growth and the like in a high temperature furnace to obtain a complex-phase sintering sample and finally controlling ball milling. The electric and magnetic parameter resonance phenomena of the BaTiO3 / Co3O4 oxide complex-phase millimeter wave absorbing powder under the millimeter wave characteristic frequencybands are successively achieved, the frequency of their wave absorbing frequency bands is 35GHz in a typical millimeter wave window, the frequency band width can be up to 5 GHz, an RL value reaches -40 dB. The preparation method of the complex-phase millimeter wave absorbing powder is simple in preparation process and low in cost, and can be widely used in the fields of millimeter wave electromagnetic shielding and invisibility.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, in particular to a barium titanate / cobalt tetroxide (BaTiO 3 / Co 3 o 4 ) complex phase millimeter wave absorbing powder and its preparation method. The absorbing properties of this absorbing material are controlled by the electromagnetic resonance of the system. Background technique [0002] The advent of the information age has led to the rapid development of radio application technology, and the application of electromagnetic waves is becoming more and more extensive. For example, the millimeter frequency band is an important frequency range for electromagnetic wave applications. While electromagnetic waves bring great convenience to our lives, they also have serious impacts. The development of electromagnetic wave detection technology has threatened national defense security. Electromagnetic radiation and interference have also caused serious threats to human health, environmental s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/01C04B35/626H01F1/03
CPCC04B35/01C04B35/4682C04B35/6261C04B2235/6562C04B2235/785C04B2235/786H01F1/0313
Inventor 杜丕一田薇马若阳王宗荣马宁
Owner ZHEJIANG UNIV
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