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Samarium-ferrite radar absorbing material and preparation method thereof

A technology of radar absorbing materials and oxygen bodies, applied in the field of radar absorbing materials, can solve the problems of restricting the industrialized mass production of materials, unfavorable practical application, complicated process flow, etc. The effect of the application foreground

Active Publication Date: 2013-07-17
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN101255052A uses citric acid sol-gel method to prepare lithium ferrite. Its main performance is that the minimum value of reflection blocking attenuation in the low frequency range of 0.5~3GHz can reach -21dB, and the effective wave-absorbing frequency bandwidth is 1.0GHz. Although Its absorbing performance is good, but the absorption frequency band is too narrow to use in practical applications
Patent CN 1807537A reports the application of in-situ deposition to prepare composite absorbing materials. Although this process has certain novelty, the process is complicated and the cycle is long, which greatly limits the industrialized mass production of materials.

Method used

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  • Samarium-ferrite radar absorbing material and preparation method thereof
  • Samarium-ferrite radar absorbing material and preparation method thereof
  • Samarium-ferrite radar absorbing material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A. Raw material preparation: according to the molecular formula BaMn 0.4 Zn 0.4 Al 0.2 CoFe 16 o 27 The stoichiometric ratio of each metal nitrate Ba (NO 3 ) 2 , Co (NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 9H 2 O, Mn (NO 3 ) 2 , Zn (NO 3 ) 2 ·6H 2 O, Al (NO 3 ) 3 9H 2 0, simultaneously take citric acid by citric acid / metal ion total molar number=0.6:1, dissolve metal nitrate and citric acid respectively with deionized water, obtain reddish-brown clear solution and colorless transparent solution respectively, add simultaneously The molar ratio of ethylene glycol / citric acid=0.6 Add polyethylene glycol, adjust the pH to 4 with ammonia water, and the solution is dark reddish brown at this time;

[0033] B. Dry gel preparation: put the solution in step A under electric stirring, slowly concentrate in a 50°C water bath for 12 hours, then move to a 100°C oven and continue drying for 40 hours until a black fluffy dry gel is formed;

[0034] C. Heat treatment proc...

Embodiment 2

[0037] A. Raw material preparation: according to the molecular formula BaMn 0.4 Zn 0.4 Al 0.2 CoFe 16 o 27 The stoichiometric ratio of each metal nitrate Ba (NO 3 ) 2 , Co (NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 9H 2 O, Mn (NO 3 ) 2 , Zn (NO 3 ) 2 ·6H 2 O, Al (NO 3 ) 3 9H 20, simultaneously take citric acid by citric acid / metal ion total molar number=0.8:1, dissolve metal nitrate and citric acid respectively with deionized water, obtain reddish-brown clear solution and colorless transparent solution respectively, add simultaneously The molar ratio of ethylene glycol / citric acid=0.8 Add polyethylene glycol, adjust the pH to 5 with ammonia water, and the solution is dark reddish brown at this time;

[0038] B. Preparation of xerogel: Place the solution in step A under electric stirring, slowly concentrate in a 55°C water bath for 11.5h, then move to an oven at 105°C and continue drying for 38h until a black fluffy xerogel is formed;

[0039] C. Heat treatment proc...

Embodiment 3

[0041] A. Raw material preparation: according to molecular formula Ba 0.9 SM 0.1 mn 0.4 Zn 0.4 Al 0.2 CoFe 16 o 27 The stoichiometric ratio of each metal nitrate Ba (NO 3 ) 2 , Co (NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 9H 2 O, Mn (NO 3 ) 2 , Zn (NO 3 ) 2 ·6H 2 O, Al (NO 3 ) 3 9H 2 O and Sm (NO 3 ) 3 ·6H 2 O, add SiO 2 0.2%wt, CaO0.2%wt, MgO0.5%wt, weigh citric acid according to citric acid / metal ion total molar number=1:1 simultaneously, dissolve metal nitrate and citric acid respectively with deionized water, obtain respectively Reddish-brown solution and colorless transparent solution, add polyethylene glycol at the same time according to the molar ratio of polyethylene glycol / citric acid = 1, adjust the pH to 6 with ammonia water, and the solution is dark reddish-brown at this time;

[0042] B. Preparation of xerogel: Place the solution in step A under electric stirring, slowly concentrate in a water bath at 60°C for 11 hours, then move to an oven at 11...

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Abstract

The invention discloses a samarium-ferrite radar absorbing material and a preparation method thereof, and relates the technical field of radar absorbing materials, and specially, relates to samarium-ferrite magnetic powder. The preparation method of the samarium-ferrite radar absorbing material utilizes metal nitrates as raw materials, and oxides of SiO2, MgO, CaO and the like as doping agents, and comprises the following steps of dissolving the raw materials and the doping agents in deionized water, adding a hydroxy acid or amino acids and polyethylene glycol into the mixture, adjusting a pHvalue of the mixture to a pH value of 4 to 9 by ammonia water, carrying out water-bath condensation and oven drying to obtain xerogel, and heating the xerogel to a temperature of 1200 to 1400 DEG C by stages to obtain W-type samarium-ferrite magnetic powder by calcination. The W-type samarium-ferrite magnetic powder obtained by the preparation method has crystal grain sizes of 1 to 10 micrometers. The reflectivity which belongs to the W-type samarium-ferrite magnetic powder and is measured in a frequency range of 1 to 18GHz is in a range of -14.4 to 7.5dB. The main loss is magnetic loss. Therefore, the W-type samarium-ferrite magnetic powder has advantages in multi-layer composite material application.

Description

technical field [0001] The invention relates to the technical field of radar absorbing materials, in particular to a preparation method of a single W-type ferrite radar absorbing material doped with samarium elements. Background technique [0002] Among the ferrite-based magnetic absorbing materials, hexagonal magnetoplumbite ferrite has been widely studied and applied because of its high saturation magnetization and natural resonance frequency. At present, the optimization of its magnetic and dielectric properties is mainly studied in the aspect of ion modification. [0003] The methods used to prepare ferrite mainly include sol-gel method and chemical co-precipitation method, but chemical co-precipitation method is generally only applied to the preparation of single-component or two-component oxides. For the preparation of multi-component oxides involving The problem of ion co-precipitation often causes problems such as uneven dispersion of ions. The sol-gel method can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/40C04B35/624
Inventor 张跃黄海亮严生虎刘建武沈介发
Owner 溧阳常大技术转移中心有限公司
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